fs/ext4/inline.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (c) 2012 Taobao.
   4  * Written by Tao Ma <boyu.mt@taobao.com>
   5  */
   6
   7 #include <linux/iomap.h>
   8 #include <linux/fiemap.h>
   9 #include <linux/iversion.h>
  10 #include <linux/backing-dev.h>
  11
  12 #include "ext4_jbd2.h"
  13 #include "ext4.h"
  14 #include "xattr.h"
  15 #include "truncate.h"
  16
  17 #define EXT4_XATTR_SYSTEM_DATA  "data"
  18 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  19 #define EXT4_INLINE_DOTDOT_OFFSET       2
  20 #define EXT4_INLINE_DOTDOT_SIZE         4
  21
  22 static int ext4_get_inline_size(struct inode *inode)
  23 {
  24         if (EXT4_I(inode)->i_inline_off)
  25                 return EXT4_I(inode)->i_inline_size;
  26
  27         return 0;
  28 }
  29
  30 static int get_max_inline_xattr_value_size(struct inode *inode,
  31                                            struct ext4_iloc *iloc)
  32 {
  33         struct ext4_xattr_ibody_header *header;
  34         struct ext4_xattr_entry *entry;
  35         struct ext4_inode *raw_inode;
  36         void *end;
  37         int free, min_offs;
  38
  39         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  40                 return 0;
  41
  42         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  43                         EXT4_GOOD_OLD_INODE_SIZE -
  44                         EXT4_I(inode)->i_extra_isize -
  45                         sizeof(struct ext4_xattr_ibody_header);
  46
  47         /*
  48          * We need to subtract another sizeof(__u32) since an in-inode xattr
  49          * needs an empty 4 bytes to indicate the gap between the xattr entry
  50          * and the name/value pair.
  51          */
  52         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  53                 return EXT4_XATTR_SIZE(min_offs -
  54                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  55                         EXT4_XATTR_ROUND - sizeof(__u32));
  56
  57         raw_inode = ext4_raw_inode(iloc);
  58         header = IHDR(inode, raw_inode);
  59         entry = IFIRST(header);
  60         end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  61
  62         /* Compute min_offs. */
  63         while (!IS_LAST_ENTRY(entry)) {
  64                 void *next = EXT4_XATTR_NEXT(entry);
  65
  66                 if (next >= end) {
  67                         EXT4_ERROR_INODE(inode,
  68                                          "corrupt xattr in inline inode");
  69                         return 0;
  70                 }
  71                 if (!entry->e_value_inum && entry->e_value_size) {
  72                         size_t offs = le16_to_cpu(entry->e_value_offs);
  73                         if (offs < min_offs)
  74                                 min_offs = offs;
  75                 }
  76                 entry = next;
  77         }
  78         free = min_offs -
  79                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  80
  81         if (EXT4_I(inode)->i_inline_off) {
  82                 entry = (struct ext4_xattr_entry *)
  83                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  84
  85                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  86                 goto out;
  87         }
  88
  89         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  90
  91         if (free > EXT4_XATTR_ROUND)
  92                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  93         else
  94                 free = 0;
  95
  96 out:
  97         return free;
  98 }
  99
 100 /*
 101  * Get the maximum size we now can store in an inode.
 102  * If we can't find the space for a xattr entry, don't use the space
 103  * of the extents since we have no space to indicate the inline data.
 104  */
 105 int ext4_get_max_inline_size(struct inode *inode)
 106 {
 107         int error, max_inline_size;
 108         struct ext4_iloc iloc;
 109
 110         if (EXT4_I(inode)->i_extra_isize == 0)
 111                 return 0;
 112
 113         error = ext4_get_inode_loc(inode, &iloc);
 114         if (error) {
 115                 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 116                                      "can't get inode location %lu",
 117                                      inode->i_ino);
 118                 return 0;
 119         }
 120
 121         down_read(&EXT4_I(inode)->xattr_sem);
 122         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 123         up_read(&EXT4_I(inode)->xattr_sem);
 124
 125         brelse(iloc.bh);
 126
 127         if (!max_inline_size)
 128                 return 0;
 129
 130         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 131 }
 132
 133 /*
 134  * this function does not take xattr_sem, which is OK because it is
 135  * currently only used in a code path coming form ext4_iget, before
 136  * the new inode has been unlocked
 137  */
 138 int ext4_find_inline_data_nolock(struct inode *inode)
 139 {
 140         struct ext4_xattr_ibody_find is = {
 141                 .s = { .not_found = -ENODATA, },
 142         };
 143         struct ext4_xattr_info i = {
 144                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 145                 .name = EXT4_XATTR_SYSTEM_DATA,
 146         };
 147         int error;
 148
 149         if (EXT4_I(inode)->i_extra_isize == 0)
 150                 return 0;
 151
 152         error = ext4_get_inode_loc(inode, &is.iloc);
 153         if (error)
 154                 return error;
 155
 156         error = ext4_xattr_ibody_find(inode, &i, &is);
 157         if (error)
 158                 goto out;
 159
 160         if (!is.s.not_found) {
 161                 if (is.s.here->e_value_inum) {
 162                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 163                                          "to an external xattr inode");
 164                         error = -EFSCORRUPTED;
 165                         goto out;
 166                 }
 167                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 168                                         (void *)ext4_raw_inode(&is.iloc));
 169                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 170                                 le32_to_cpu(is.s.here->e_value_size);
 171         }
 172 out:
 173         brelse(is.iloc.bh);
 174         return error;
 175 }
 176
 177 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 178                                  unsigned int len,
 179                                  struct ext4_iloc *iloc)
 180 {
 181         struct ext4_xattr_entry *entry;
 182         struct ext4_xattr_ibody_header *header;
 183         int cp_len = 0;
 184         struct ext4_inode *raw_inode;
 185
 186         if (!len)
 187                 return 0;
 188
 189         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 190
 191         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 192                         len : EXT4_MIN_INLINE_DATA_SIZE;
 193
 194         raw_inode = ext4_raw_inode(iloc);
 195         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 196
 197         len -= cp_len;
 198         buffer += cp_len;
 199
 200         if (!len)
 201                 goto out;
 202
 203         header = IHDR(inode, raw_inode);
 204         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 205                                             EXT4_I(inode)->i_inline_off);
 206         len = min_t(unsigned int, len,
 207                     (unsigned int)le32_to_cpu(entry->e_value_size));
 208
 209         memcpy(buffer,
 210                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 211         cp_len += len;
 212
 213 out:
 214         return cp_len;
 215 }
 216
 217 /*
 218  * write the buffer to the inline inode.
 219  * If 'create' is set, we don't need to do the extra copy in the xattr
 220  * value since it is already handled by ext4_xattr_ibody_set.
 221  * That saves us one memcpy.
 222  */
 223 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 224                                    void *buffer, loff_t pos, unsigned int len)
 225 {
 226         struct ext4_xattr_entry *entry;
 227         struct ext4_xattr_ibody_header *header;
 228         struct ext4_inode *raw_inode;
 229         int cp_len = 0;
 230
 231         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 232                 return;
 233
 234         BUG_ON(!EXT4_I(inode)->i_inline_off);
 235         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 236
 237         raw_inode = ext4_raw_inode(iloc);
 238         buffer += pos;
 239
 240         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 241                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 242                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 243                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 244
 245                 len -= cp_len;
 246                 buffer += cp_len;
 247                 pos += cp_len;
 248         }
 249
 250         if (!len)
 251                 return;
 252
 253         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 254         header = IHDR(inode, raw_inode);
 255         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 256                                             EXT4_I(inode)->i_inline_off);
 257
 258         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 259                buffer, len);
 260 }
 261
 262 static int ext4_create_inline_data(handle_t *handle,
 263                                    struct inode *inode, unsigned len)
 264 {
 265         int error;
 266         void *value = NULL;
 267         struct ext4_xattr_ibody_find is = {
 268                 .s = { .not_found = -ENODATA, },
 269         };
 270         struct ext4_xattr_info i = {
 271                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 272                 .name = EXT4_XATTR_SYSTEM_DATA,
 273         };
 274
 275         error = ext4_get_inode_loc(inode, &is.iloc);
 276         if (error)
 277                 return error;
 278
 279         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 280         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 281                                               EXT4_JTR_NONE);
 282         if (error)
 283                 goto out;
 284
 285         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 286                 value = EXT4_ZERO_XATTR_VALUE;
 287                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 288         } else {
 289                 value = "";
 290                 len = 0;
 291         }
 292
 293         /* Insert the xttr entry. */
 294         i.value = value;
 295         i.value_len = len;
 296
 297         error = ext4_xattr_ibody_find(inode, &i, &is);
 298         if (error)
 299                 goto out;
 300
 301         BUG_ON(!is.s.not_found);
 302
 303         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 304         if (error) {
 305                 if (error == -ENOSPC)
 306                         ext4_clear_inode_state(inode,
 307                                                EXT4_STATE_MAY_INLINE_DATA);
 308                 goto out;
 309         }
 310
 311         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 312                 0, EXT4_MIN_INLINE_DATA_SIZE);
 313
 314         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 315                                       (void *)ext4_raw_inode(&is.iloc));
 316         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 317         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 318         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 319         get_bh(is.iloc.bh);
 320         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 321
 322 out:
 323         brelse(is.iloc.bh);
 324         return error;
 325 }
 326
 327 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 328                                    unsigned int len)
 329 {
 330         int error;
 331         void *value = NULL;
 332         struct ext4_xattr_ibody_find is = {
 333                 .s = { .not_found = -ENODATA, },
 334         };
 335         struct ext4_xattr_info i = {
 336                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 337                 .name = EXT4_XATTR_SYSTEM_DATA,
 338         };
 339
 340         /* If the old space is ok, write the data directly. */
 341         if (len <= EXT4_I(inode)->i_inline_size)
 342                 return 0;
 343
 344         error = ext4_get_inode_loc(inode, &is.iloc);
 345         if (error)
 346                 return error;
 347
 348         error = ext4_xattr_ibody_find(inode, &i, &is);
 349         if (error)
 350                 goto out;
 351
 352         BUG_ON(is.s.not_found);
 353
 354         len -= EXT4_MIN_INLINE_DATA_SIZE;
 355         value = kzalloc(len, GFP_NOFS);
 356         if (!value) {
 357                 error = -ENOMEM;
 358                 goto out;
 359         }
 360
 361         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 362                                      value, len);
 363         if (error < 0)
 364                 goto out;
 365
 366         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 367         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 368                                               EXT4_JTR_NONE);
 369         if (error)
 370                 goto out;
 371
 372         /* Update the xattr entry. */
 373         i.value = value;
 374         i.value_len = len;
 375
 376         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 377         if (error)
 378                 goto out;
 379
 380         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 381                                       (void *)ext4_raw_inode(&is.iloc));
 382         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 383                                 le32_to_cpu(is.s.here->e_value_size);
 384         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 385         get_bh(is.iloc.bh);
 386         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 387
 388 out:
 389         kfree(value);
 390         brelse(is.iloc.bh);
 391         return error;
 392 }
 393
 394 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 395                                     unsigned int len)
 396 {
 397         int ret, size, no_expand;
 398         struct ext4_inode_info *ei = EXT4_I(inode);
 399
 400         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 401                 return -ENOSPC;
 402
 403         size = ext4_get_max_inline_size(inode);
 404         if (size < len)
 405                 return -ENOSPC;
 406
 407         ext4_write_lock_xattr(inode, &no_expand);
 408
 409         if (ei->i_inline_off)
 410                 ret = ext4_update_inline_data(handle, inode, len);
 411         else
 412                 ret = ext4_create_inline_data(handle, inode, len);
 413
 414         ext4_write_unlock_xattr(inode, &no_expand);
 415         return ret;
 416 }
 417
 418 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 419                                            struct inode *inode)
 420 {
 421         struct ext4_inode_info *ei = EXT4_I(inode);
 422         struct ext4_xattr_ibody_find is = {
 423                 .s = { .not_found = 0, },
 424         };
 425         struct ext4_xattr_info i = {
 426                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 427                 .name = EXT4_XATTR_SYSTEM_DATA,
 428                 .value = NULL,
 429                 .value_len = 0,
 430         };
 431         int error;
 432
 433         if (!ei->i_inline_off)
 434                 return 0;
 435
 436         error = ext4_get_inode_loc(inode, &is.iloc);
 437         if (error)
 438                 return error;
 439
 440         error = ext4_xattr_ibody_find(inode, &i, &is);
 441         if (error)
 442                 goto out;
 443
 444         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 445         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 446                                               EXT4_JTR_NONE);
 447         if (error)
 448                 goto out;
 449
 450         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 451         if (error)
 452                 goto out;
 453
 454         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 455                 0, EXT4_MIN_INLINE_DATA_SIZE);
 456         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 457
 458         if (ext4_has_feature_extents(inode->i_sb)) {
 459                 if (S_ISDIR(inode->i_mode) ||
 460                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 461                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 462                         ext4_ext_tree_init(handle, inode);
 463                 }
 464         }
 465         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 466
 467         get_bh(is.iloc.bh);
 468         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 469
 470         EXT4_I(inode)->i_inline_off = 0;
 471         EXT4_I(inode)->i_inline_size = 0;
 472         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 473 out:
 474         brelse(is.iloc.bh);
 475         if (error == -ENODATA)
 476                 error = 0;
 477         return error;
 478 }
 479
 480 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 481 {
 482         void *kaddr;
 483         int ret = 0;
 484         size_t len;
 485         struct ext4_iloc iloc;
 486
 487         BUG_ON(!PageLocked(page));
 488         BUG_ON(!ext4_has_inline_data(inode));
 489         BUG_ON(page->index);
 490
 491         if (!EXT4_I(inode)->i_inline_off) {
 492                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 493                              inode->i_ino);
 494                 goto out;
 495         }
 496
 497         ret = ext4_get_inode_loc(inode, &iloc);
 498         if (ret)
 499                 goto out;
 500
 501         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 502         kaddr = kmap_atomic(page);
 503         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 504         flush_dcache_page(page);
 505         kunmap_atomic(kaddr);
 506         zero_user_segment(page, len, PAGE_SIZE);
 507         SetPageUptodate(page);
 508         brelse(iloc.bh);
 509
 510 out:
 511         return ret;
 512 }
 513
 514 int ext4_readpage_inline(struct inode *inode, struct page *page)
 515 {
 516         int ret = 0;
 517
 518         down_read(&EXT4_I(inode)->xattr_sem);
 519         if (!ext4_has_inline_data(inode)) {
 520                 up_read(&EXT4_I(inode)->xattr_sem);
 521                 return -EAGAIN;
 522         }
 523
 524         /*
 525          * Current inline data can only exist in the 1st page,
 526          * So for all the other pages, just set them uptodate.
 527          */
 528         if (!page->index)
 529                 ret = ext4_read_inline_page(inode, page);
 530         else if (!PageUptodate(page)) {
 531                 zero_user_segment(page, 0, PAGE_SIZE);
 532                 SetPageUptodate(page);
 533         }
 534
 535         up_read(&EXT4_I(inode)->xattr_sem);
 536
 537         unlock_page(page);
 538         return ret >= 0 ? 0 : ret;
 539 }
 540
 541 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 542                                               struct inode *inode,
 543                                               unsigned flags)
 544 {
 545         int ret, needed_blocks, no_expand;
 546         handle_t *handle = NULL;
 547         int retries = 0, sem_held = 0;
 548         struct page *page = NULL;
 549         unsigned from, to;
 550         struct ext4_iloc iloc;
 551
 552         if (!ext4_has_inline_data(inode)) {
 553                 /*
 554                  * clear the flag so that no new write
 555                  * will trap here again.
 556                  */
 557                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 558                 return 0;
 559         }
 560
 561         needed_blocks = ext4_writepage_trans_blocks(inode);
 562
 563         ret = ext4_get_inode_loc(inode, &iloc);
 564         if (ret)
 565                 return ret;
 566
 567 retry:
 568         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 569         if (IS_ERR(handle)) {
 570                 ret = PTR_ERR(handle);
 571                 handle = NULL;
 572                 goto out;
 573         }
 574
 575         /* We cannot recurse into the filesystem as the transaction is already
 576          * started */
 577         flags |= AOP_FLAG_NOFS;
 578
 579         page = grab_cache_page_write_begin(mapping, 0, flags);
 580         if (!page) {
 581                 ret = -ENOMEM;
 582                 goto out;
 583         }
 584
 585         ext4_write_lock_xattr(inode, &no_expand);
 586         sem_held = 1;
 587         /* If some one has already done this for us, just exit. */
 588         if (!ext4_has_inline_data(inode)) {
 589                 ret = 0;
 590                 goto out;
 591         }
 592
 593         from = 0;
 594         to = ext4_get_inline_size(inode);
 595         if (!PageUptodate(page)) {
 596                 ret = ext4_read_inline_page(inode, page);
 597                 if (ret < 0)
 598                         goto out;
 599         }
 600
 601         ret = ext4_destroy_inline_data_nolock(handle, inode);
 602         if (ret)
 603                 goto out;
 604
 605         if (ext4_should_dioread_nolock(inode)) {
 606                 ret = __block_write_begin(page, from, to,
 607                                           ext4_get_block_unwritten);
 608         } else
 609                 ret = __block_write_begin(page, from, to, ext4_get_block);
 610
 611         if (!ret && ext4_should_journal_data(inode)) {
 612                 ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
 613                                              from, to, NULL,
 614                                              do_journal_get_write_access);
 615         }
 616
 617         if (ret) {
 618                 unlock_page(page);
 619                 put_page(page);
 620                 page = NULL;
 621                 ext4_orphan_add(handle, inode);
 622                 ext4_write_unlock_xattr(inode, &no_expand);
 623                 sem_held = 0;
 624                 ext4_journal_stop(handle);
 625                 handle = NULL;
 626                 ext4_truncate_failed_write(inode);
 627                 /*
 628                  * If truncate failed early the inode might
 629                  * still be on the orphan list; we need to
 630                  * make sure the inode is removed from the
 631                  * orphan list in that case.
 632                  */
 633                 if (inode->i_nlink)
 634                         ext4_orphan_del(NULL, inode);
 635         }
 636
 637         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 638                 goto retry;
 639
 640         if (page)
 641                 block_commit_write(page, from, to);
 642 out:
 643         if (page) {
 644                 unlock_page(page);
 645                 put_page(page);
 646         }
 647         if (sem_held)
 648                 ext4_write_unlock_xattr(inode, &no_expand);
 649         if (handle)
 650                 ext4_journal_stop(handle);
 651         brelse(iloc.bh);
 652         return ret;
 653 }
 654
 655 /*
 656  * Try to write data in the inode.
 657  * If the inode has inline data, check whether the new write can be
 658  * in the inode also. If not, create the page the handle, move the data
 659  * to the page make it update and let the later codes create extent for it.
 660  */
 661 int ext4_try_to_write_inline_data(struct address_space *mapping,
 662                                   struct inode *inode,
 663                                   loff_t pos, unsigned len,
 664                                   unsigned flags,
 665                                   struct page **pagep)
 666 {
 667         int ret;
 668         handle_t *handle;
 669         struct page *page;
 670         struct ext4_iloc iloc;
 671
 672         if (pos + len > ext4_get_max_inline_size(inode))
 673                 goto convert;
 674
 675         ret = ext4_get_inode_loc(inode, &iloc);
 676         if (ret)
 677                 return ret;
 678
 679         /*
 680          * The possible write could happen in the inode,
 681          * so try to reserve the space in inode first.
 682          */
 683         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 684         if (IS_ERR(handle)) {
 685                 ret = PTR_ERR(handle);
 686                 handle = NULL;
 687                 goto out;
 688         }
 689
 690         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 691         if (ret && ret != -ENOSPC)
 692                 goto out;
 693
 694         /* We don't have space in inline inode, so convert it to extent. */
 695         if (ret == -ENOSPC) {
 696                 ext4_journal_stop(handle);
 697                 brelse(iloc.bh);
 698                 goto convert;
 699         }
 700
 701         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 702                                             EXT4_JTR_NONE);
 703         if (ret)
 704                 goto out;
 705
 706         flags |= AOP_FLAG_NOFS;
 707
 708         page = grab_cache_page_write_begin(mapping, 0, flags);
 709         if (!page) {
 710                 ret = -ENOMEM;
 711                 goto out;
 712         }
 713
 714         *pagep = page;
 715         down_read(&EXT4_I(inode)->xattr_sem);
 716         if (!ext4_has_inline_data(inode)) {
 717                 ret = 0;
 718                 unlock_page(page);
 719                 put_page(page);
 720                 goto out_up_read;
 721         }
 722
 723         if (!PageUptodate(page)) {
 724                 ret = ext4_read_inline_page(inode, page);
 725                 if (ret < 0) {
 726                         unlock_page(page);
 727                         put_page(page);
 728                         goto out_up_read;
 729                 }
 730         }
 731
 732         ret = 1;
 733         handle = NULL;
 734 out_up_read:
 735         up_read(&EXT4_I(inode)->xattr_sem);
 736 out:
 737         if (handle && (ret != 1))
 738                 ext4_journal_stop(handle);
 739         brelse(iloc.bh);
 740         return ret;
 741 convert:
 742         return ext4_convert_inline_data_to_extent(mapping,
 743                                                   inode, flags);
 744 }
 745
 746 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 747                                unsigned copied, struct page *page)
 748 {
 749         handle_t *handle = ext4_journal_current_handle();
 750         int no_expand;
 751         void *kaddr;
 752         struct ext4_iloc iloc;
 753         int ret = 0, ret2;
 754
 755         if (unlikely(copied < len) && !PageUptodate(page))
 756                 copied = 0;
 757
 758         if (likely(copied)) {
 759                 ret = ext4_get_inode_loc(inode, &iloc);
 760                 if (ret) {
 761                         unlock_page(page);
 762                         put_page(page);
 763                         ext4_std_error(inode->i_sb, ret);
 764                         goto out;
 765                 }
 766                 ext4_write_lock_xattr(inode, &no_expand);
 767                 BUG_ON(!ext4_has_inline_data(inode));
 768
 769                 /*
 770                  * ei->i_inline_off may have changed since
 771                  * ext4_write_begin() called
 772                  * ext4_try_to_write_inline_data()
 773                  */
 774                 (void) ext4_find_inline_data_nolock(inode);
 775
 776                 kaddr = kmap_atomic(page);
 777                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 778                 kunmap_atomic(kaddr);
 779                 SetPageUptodate(page);
 780                 /* clear page dirty so that writepages wouldn't work for us. */
 781                 ClearPageDirty(page);
 782
 783                 ext4_write_unlock_xattr(inode, &no_expand);
 784                 brelse(iloc.bh);
 785
 786                 /*
 787                  * It's important to update i_size while still holding page
 788                  * lock: page writeout could otherwise come in and zero
 789                  * beyond i_size.
 790                  */
 791                 ext4_update_inode_size(inode, pos + copied);
 792         }
 793         unlock_page(page);
 794         put_page(page);
 795
 796         /*
 797          * Don't mark the inode dirty under page lock. First, it unnecessarily
 798          * makes the holding time of page lock longer. Second, it forces lock
 799          * ordering of page lock and transaction start for journaling
 800          * filesystems.
 801          */
 802         if (likely(copied))
 803                 mark_inode_dirty(inode);
 804 out:
 805         /*
 806          * If we didn't copy as much data as expected, we need to trim back
 807          * size of xattr containing inline data.
 808          */
 809         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 810                 ext4_orphan_add(handle, inode);
 811
 812         ret2 = ext4_journal_stop(handle);
 813         if (!ret)
 814                 ret = ret2;
 815         if (pos + len > inode->i_size) {
 816                 ext4_truncate_failed_write(inode);
 817                 /*
 818                  * If truncate failed early the inode might still be
 819                  * on the orphan list; we need to make sure the inode
 820                  * is removed from the orphan list in that case.
 821                  */
 822                 if (inode->i_nlink)
 823                         ext4_orphan_del(NULL, inode);
 824         }
 825         return ret ? ret : copied;
 826 }
 827
 828 struct buffer_head *
 829 ext4_journalled_write_inline_data(struct inode *inode,
 830                                   unsigned len,
 831                                   struct page *page)
 832 {
 833         int ret, no_expand;
 834         void *kaddr;
 835         struct ext4_iloc iloc;
 836
 837         ret = ext4_get_inode_loc(inode, &iloc);
 838         if (ret) {
 839                 ext4_std_error(inode->i_sb, ret);
 840                 return NULL;
 841         }
 842
 843         ext4_write_lock_xattr(inode, &no_expand);
 844         kaddr = kmap_atomic(page);
 845         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 846         kunmap_atomic(kaddr);
 847         ext4_write_unlock_xattr(inode, &no_expand);
 848
 849         return iloc.bh;
 850 }
 851
 852 /*
 853  * Try to make the page cache and handle ready for the inline data case.
 854  * We can call this function in 2 cases:
 855  * 1. The inode is created and the first write exceeds inline size. We can
 856  *    clear the inode state safely.
 857  * 2. The inode has inline data, then we need to read the data, make it
 858  *    update and dirty so that ext4_da_writepages can handle it. We don't
 859  *    need to start the journal since the file's metadata isn't changed now.
 860  */
 861 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 862                                                  struct inode *inode,
 863                                                  unsigned flags,
 864                                                  void **fsdata)
 865 {
 866         int ret = 0, inline_size;
 867         struct page *page;
 868
 869         page = grab_cache_page_write_begin(mapping, 0, flags);
 870         if (!page)
 871                 return -ENOMEM;
 872
 873         down_read(&EXT4_I(inode)->xattr_sem);
 874         if (!ext4_has_inline_data(inode)) {
 875                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 876                 goto out;
 877         }
 878
 879         inline_size = ext4_get_inline_size(inode);
 880
 881         if (!PageUptodate(page)) {
 882                 ret = ext4_read_inline_page(inode, page);
 883                 if (ret < 0)
 884                         goto out;
 885         }
 886
 887         ret = __block_write_begin(page, 0, inline_size,
 888                                   ext4_da_get_block_prep);
 889         if (ret) {
 890                 up_read(&EXT4_I(inode)->xattr_sem);
 891                 unlock_page(page);
 892                 put_page(page);
 893                 ext4_truncate_failed_write(inode);
 894                 return ret;
 895         }
 896
 897         SetPageDirty(page);
 898         SetPageUptodate(page);
 899         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 900         *fsdata = (void *)CONVERT_INLINE_DATA;
 901
 902 out:
 903         up_read(&EXT4_I(inode)->xattr_sem);
 904         if (page) {
 905                 unlock_page(page);
 906                 put_page(page);
 907         }
 908         return ret;
 909 }
 910
 911 /*
 912  * Prepare the write for the inline data.
 913  * If the data can be written into the inode, we just read
 914  * the page and make it uptodate, and start the journal.
 915  * Otherwise read the page, makes it dirty so that it can be
 916  * handle in writepages(the i_disksize update is left to the
 917  * normal ext4_da_write_end).
 918  */
 919 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 920                                     struct inode *inode,
 921                                     loff_t pos, unsigned len,
 922                                     unsigned flags,
 923                                     struct page **pagep,
 924                                     void **fsdata)
 925 {
 926         int ret, inline_size;
 927         handle_t *handle;
 928         struct page *page;
 929         struct ext4_iloc iloc;
 930         int retries = 0;
 931
 932         ret = ext4_get_inode_loc(inode, &iloc);
 933         if (ret)
 934                 return ret;
 935
 936 retry_journal:
 937         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 938         if (IS_ERR(handle)) {
 939                 ret = PTR_ERR(handle);
 940                 goto out;
 941         }
 942
 943         inline_size = ext4_get_max_inline_size(inode);
 944
 945         ret = -ENOSPC;
 946         if (inline_size >= pos + len) {
 947                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 948                 if (ret && ret != -ENOSPC)
 949                         goto out_journal;
 950         }
 951
 952         /*
 953          * We cannot recurse into the filesystem as the transaction
 954          * is already started.
 955          */
 956         flags |= AOP_FLAG_NOFS;
 957
 958         if (ret == -ENOSPC) {
 959                 ext4_journal_stop(handle);
 960                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 961                                                             inode,
 962                                                             flags,
 963                                                             fsdata);
 964                 if (ret == -ENOSPC &&
 965                     ext4_should_retry_alloc(inode->i_sb, &retries))
 966                         goto retry_journal;
 967                 goto out;
 968         }
 969
 970         page = grab_cache_page_write_begin(mapping, 0, flags);
 971         if (!page) {
 972                 ret = -ENOMEM;
 973                 goto out_journal;
 974         }
 975
 976         down_read(&EXT4_I(inode)->xattr_sem);
 977         if (!ext4_has_inline_data(inode)) {
 978                 ret = 0;
 979                 goto out_release_page;
 980         }
 981
 982         if (!PageUptodate(page)) {
 983                 ret = ext4_read_inline_page(inode, page);
 984                 if (ret < 0)
 985                         goto out_release_page;
 986         }
 987         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 988                                             EXT4_JTR_NONE);
 989         if (ret)
 990                 goto out_release_page;
 991
 992         up_read(&EXT4_I(inode)->xattr_sem);
 993         *pagep = page;
 994         brelse(iloc.bh);
 995         return 1;
 996 out_release_page:
 997         up_read(&EXT4_I(inode)->xattr_sem);
 998         unlock_page(page);
 999         put_page(page);
1000 out_journal:
1001         ext4_journal_stop(handle);
1002 out:
1003         brelse(iloc.bh);
1004         return ret;
1005 }
1006
1007 #ifdef INLINE_DIR_DEBUG
1008 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
1009                           void *inline_start, int inline_size)
1010 {
1011         int offset;
1012         unsigned short de_len;
1013         struct ext4_dir_entry_2 *de = inline_start;
1014         void *dlimit = inline_start + inline_size;
1015
1016         trace_printk("inode %lu\n", dir->i_ino);
1017         offset = 0;
1018         while ((void *)de < dlimit) {
1019                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1020                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1021                              offset, de_len, de->name_len, de->name,
1022                              de->name_len, le32_to_cpu(de->inode));
1023                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1024                                          inline_start, inline_size, offset))
1025                         BUG();
1026
1027                 offset += de_len;
1028                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1029         }
1030 }
1031 #else
1032 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1033 #endif
1034
1035 /*
1036  * Add a new entry into a inline dir.
1037  * It will return -ENOSPC if no space is available, and -EIO
1038  * and -EEXIST if directory entry already exists.
1039  */
1040 static int ext4_add_dirent_to_inline(handle_t *handle,
1041                                      struct ext4_filename *fname,
1042                                      struct inode *dir,
1043                                      struct inode *inode,
1044                                      struct ext4_iloc *iloc,
1045                                      void *inline_start, int inline_size)
1046 {
1047         int             err;
1048         struct ext4_dir_entry_2 *de;
1049
1050         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1051                                 inline_size, fname, &de);
1052         if (err)
1053                 return err;
1054
1055         BUFFER_TRACE(iloc->bh, "get_write_access");
1056         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1057                                             EXT4_JTR_NONE);
1058         if (err)
1059                 return err;
1060         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1061
1062         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1063
1064         /*
1065          * XXX shouldn't update any times until successful
1066          * completion of syscall, but too many callers depend
1067          * on this.
1068          *
1069          * XXX similarly, too many callers depend on
1070          * ext4_new_inode() setting the times, but error
1071          * recovery deletes the inode, so the worst that can
1072          * happen is that the times are slightly out of date
1073          * and/or different from the directory change time.
1074          */
1075         dir->i_mtime = dir->i_ctime = current_time(dir);
1076         ext4_update_dx_flag(dir);
1077         inode_inc_iversion(dir);
1078         return 1;
1079 }
1080
1081 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1082                                        struct ext4_iloc *iloc)
1083 {
1084         struct ext4_xattr_entry *entry;
1085         struct ext4_xattr_ibody_header *header;
1086
1087         BUG_ON(!EXT4_I(inode)->i_inline_off);
1088
1089         header = IHDR(inode, ext4_raw_inode(iloc));
1090         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1091                                             EXT4_I(inode)->i_inline_off);
1092
1093         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1094 }
1095
1096 /* Set the final de to cover the whole block. */
1097 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1098 {
1099         struct ext4_dir_entry_2 *de, *prev_de;
1100         void *limit;
1101         int de_len;
1102
1103         de = (struct ext4_dir_entry_2 *)de_buf;
1104         if (old_size) {
1105                 limit = de_buf + old_size;
1106                 do {
1107                         prev_de = de;
1108                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1109                         de_buf += de_len;
1110                         de = (struct ext4_dir_entry_2 *)de_buf;
1111                 } while (de_buf < limit);
1112
1113                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1114                                                         old_size, new_size);
1115         } else {
1116                 /* this is just created, so create an empty entry. */
1117                 de->inode = 0;
1118                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1119         }
1120 }
1121
1122 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1123                                   struct ext4_iloc *iloc)
1124 {
1125         int ret;
1126         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1127         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1128
1129         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1130                 return -ENOSPC;
1131
1132         ret = ext4_update_inline_data(handle, dir,
1133                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1134         if (ret)
1135                 return ret;
1136
1137         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1138                              EXT4_I(dir)->i_inline_size -
1139                                                 EXT4_MIN_INLINE_DATA_SIZE);
1140         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1141         return 0;
1142 }
1143
1144 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1145                                      struct ext4_iloc *iloc,
1146                                      void *buf, int inline_size)
1147 {
1148         int ret;
1149
1150         ret = ext4_create_inline_data(handle, inode, inline_size);
1151         if (ret) {
1152                 ext4_msg(inode->i_sb, KERN_EMERG,
1153                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1154                         inode->i_ino, ret);
1155                 return;
1156         }
1157         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1158         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1159 }
1160
1161 static int ext4_finish_convert_inline_dir(handle_t *handle,
1162                                           struct inode *inode,
1163                                           struct buffer_head *dir_block,
1164                                           void *buf,
1165                                           int inline_size)
1166 {
1167         int err, csum_size = 0, header_size = 0;
1168         struct ext4_dir_entry_2 *de;
1169         void *target = dir_block->b_data;
1170
1171         /*
1172          * First create "." and ".." and then copy the dir information
1173          * back to the block.
1174          */
1175         de = (struct ext4_dir_entry_2 *)target;
1176         de = ext4_init_dot_dotdot(inode, de,
1177                 inode->i_sb->s_blocksize, csum_size,
1178                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1179         header_size = (void *)de - target;
1180
1181         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1182                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1183
1184         if (ext4_has_metadata_csum(inode->i_sb))
1185                 csum_size = sizeof(struct ext4_dir_entry_tail);
1186
1187         inode->i_size = inode->i_sb->s_blocksize;
1188         i_size_write(inode, inode->i_sb->s_blocksize);
1189         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1190         ext4_update_final_de(dir_block->b_data,
1191                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1192                         inode->i_sb->s_blocksize - csum_size);
1193
1194         if (csum_size)
1195                 ext4_initialize_dirent_tail(dir_block,
1196                                             inode->i_sb->s_blocksize);
1197         set_buffer_uptodate(dir_block);
1198         unlock_buffer(dir_block);
1199         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1200         if (err)
1201                 return err;
1202         set_buffer_verified(dir_block);
1203         return ext4_mark_inode_dirty(handle, inode);
1204 }
1205
1206 static int ext4_convert_inline_data_nolock(handle_t *handle,
1207                                            struct inode *inode,
1208                                            struct ext4_iloc *iloc)
1209 {
1210         int error;
1211         void *buf = NULL;
1212         struct buffer_head *data_bh = NULL;
1213         struct ext4_map_blocks map;
1214         int inline_size;
1215
1216         inline_size = ext4_get_inline_size(inode);
1217         buf = kmalloc(inline_size, GFP_NOFS);
1218         if (!buf) {
1219                 error = -ENOMEM;
1220                 goto out;
1221         }
1222
1223         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1224         if (error < 0)
1225                 goto out;
1226
1227         /*
1228          * Make sure the inline directory entries pass checks before we try to
1229          * convert them, so that we avoid touching stuff that needs fsck.
1230          */
1231         if (S_ISDIR(inode->i_mode)) {
1232                 error = ext4_check_all_de(inode, iloc->bh,
1233                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1234                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1235                 if (error)
1236                         goto out;
1237         }
1238
1239         error = ext4_destroy_inline_data_nolock(handle, inode);
1240         if (error)
1241                 goto out;
1242
1243         map.m_lblk = 0;
1244         map.m_len = 1;
1245         map.m_flags = 0;
1246         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1247         if (error < 0)
1248                 goto out_restore;
1249         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1250                 error = -EIO;
1251                 goto out_restore;
1252         }
1253
1254         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1255         if (!data_bh) {
1256                 error = -ENOMEM;
1257                 goto out_restore;
1258         }
1259
1260         lock_buffer(data_bh);
1261         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1262                                                EXT4_JTR_NONE);
1263         if (error) {
1264                 unlock_buffer(data_bh);
1265                 error = -EIO;
1266                 goto out_restore;
1267         }
1268         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1269
1270         if (!S_ISDIR(inode->i_mode)) {
1271                 memcpy(data_bh->b_data, buf, inline_size);
1272                 set_buffer_uptodate(data_bh);
1273                 unlock_buffer(data_bh);
1274                 error = ext4_handle_dirty_metadata(handle,
1275                                                    inode, data_bh);
1276         } else {
1277                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1278                                                        buf, inline_size);
1279         }
1280
1281 out_restore:
1282         if (error)
1283                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1284
1285 out:
1286         brelse(data_bh);
1287         kfree(buf);
1288         return error;
1289 }
1290
1291 /*
1292  * Try to add the new entry to the inline data.
1293  * If succeeds, return 0. If not, extended the inline dir and copied data to
1294  * the new created block.
1295  */
1296 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1297                               struct inode *dir, struct inode *inode)
1298 {
1299         int ret, ret2, inline_size, no_expand;
1300         void *inline_start;
1301         struct ext4_iloc iloc;
1302
1303         ret = ext4_get_inode_loc(dir, &iloc);
1304         if (ret)
1305                 return ret;
1306
1307         ext4_write_lock_xattr(dir, &no_expand);
1308         if (!ext4_has_inline_data(dir))
1309                 goto out;
1310
1311         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1312                                                  EXT4_INLINE_DOTDOT_SIZE;
1313         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1314
1315         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1316                                         inline_start, inline_size);
1317         if (ret != -ENOSPC)
1318                 goto out;
1319
1320         /* check whether it can be inserted to inline xattr space. */
1321         inline_size = EXT4_I(dir)->i_inline_size -
1322                         EXT4_MIN_INLINE_DATA_SIZE;
1323         if (!inline_size) {
1324                 /* Try to use the xattr space.*/
1325                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1326                 if (ret && ret != -ENOSPC)
1327                         goto out;
1328
1329                 inline_size = EXT4_I(dir)->i_inline_size -
1330                                 EXT4_MIN_INLINE_DATA_SIZE;
1331         }
1332
1333         if (inline_size) {
1334                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1335
1336                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1337                                                 inode, &iloc, inline_start,
1338                                                 inline_size);
1339
1340                 if (ret != -ENOSPC)
1341                         goto out;
1342         }
1343
1344         /*
1345          * The inline space is filled up, so create a new block for it.
1346          * As the extent tree will be created, we have to save the inline
1347          * dir first.
1348          */
1349         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1350
1351 out:
1352         ext4_write_unlock_xattr(dir, &no_expand);
1353         ret2 = ext4_mark_inode_dirty(handle, dir);
1354         if (unlikely(ret2 && !ret))
1355                 ret = ret2;
1356         brelse(iloc.bh);
1357         return ret;
1358 }
1359
1360 /*
1361  * This function fills a red-black tree with information from an
1362  * inlined dir.  It returns the number directory entries loaded
1363  * into the tree.  If there is an error it is returned in err.
1364  */
1365 int ext4_inlinedir_to_tree(struct file *dir_file,
1366                            struct inode *dir, ext4_lblk_t block,
1367                            struct dx_hash_info *hinfo,
1368                            __u32 start_hash, __u32 start_minor_hash,
1369                            int *has_inline_data)
1370 {
1371         int err = 0, count = 0;
1372         unsigned int parent_ino;
1373         int pos;
1374         struct ext4_dir_entry_2 *de;
1375         struct inode *inode = file_inode(dir_file);
1376         int ret, inline_size = 0;
1377         struct ext4_iloc iloc;
1378         void *dir_buf = NULL;
1379         struct ext4_dir_entry_2 fake;
1380         struct fscrypt_str tmp_str;
1381
1382         ret = ext4_get_inode_loc(inode, &iloc);
1383         if (ret)
1384                 return ret;
1385
1386         down_read(&EXT4_I(inode)->xattr_sem);
1387         if (!ext4_has_inline_data(inode)) {
1388                 up_read(&EXT4_I(inode)->xattr_sem);
1389                 *has_inline_data = 0;
1390                 goto out;
1391         }
1392
1393         inline_size = ext4_get_inline_size(inode);
1394         dir_buf = kmalloc(inline_size, GFP_NOFS);
1395         if (!dir_buf) {
1396                 ret = -ENOMEM;
1397                 up_read(&EXT4_I(inode)->xattr_sem);
1398                 goto out;
1399         }
1400
1401         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1402         up_read(&EXT4_I(inode)->xattr_sem);
1403         if (ret < 0)
1404                 goto out;
1405
1406         pos = 0;
1407         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1408         while (pos < inline_size) {
1409                 /*
1410                  * As inlined dir doesn't store any information about '.' and
1411                  * only the inode number of '..' is stored, we have to handle
1412                  * them differently.
1413                  */
1414                 if (pos == 0) {
1415                         fake.inode = cpu_to_le32(inode->i_ino);
1416                         fake.name_len = 1;
1417                         strcpy(fake.name, ".");
1418                         fake.rec_len = ext4_rec_len_to_disk(
1419                                           ext4_dir_rec_len(fake.name_len, NULL),
1420                                           inline_size);
1421                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1422                         de = &fake;
1423                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1424                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1425                         fake.inode = cpu_to_le32(parent_ino);
1426                         fake.name_len = 2;
1427                         strcpy(fake.name, "..");
1428                         fake.rec_len = ext4_rec_len_to_disk(
1429                                           ext4_dir_rec_len(fake.name_len, NULL),
1430                                           inline_size);
1431                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1432                         de = &fake;
1433                         pos = EXT4_INLINE_DOTDOT_SIZE;
1434                 } else {
1435                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1436                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1437                         if (ext4_check_dir_entry(inode, dir_file, de,
1438                                          iloc.bh, dir_buf,
1439                                          inline_size, pos)) {
1440                                 ret = count;
1441                                 goto out;
1442                         }
1443                 }
1444
1445                 if (ext4_hash_in_dirent(dir)) {
1446                         hinfo->hash = EXT4_DIRENT_HASH(de);
1447                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1448                 } else {
1449                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1450                 }
1451                 if ((hinfo->hash < start_hash) ||
1452                     ((hinfo->hash == start_hash) &&
1453                      (hinfo->minor_hash < start_minor_hash)))
1454                         continue;
1455                 if (de->inode == 0)
1456                         continue;
1457                 tmp_str.name = de->name;
1458                 tmp_str.len = de->name_len;
1459                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1460                                               hinfo->minor_hash, de, &tmp_str);
1461                 if (err) {
1462                         ret = err;
1463                         goto out;
1464                 }
1465                 count++;
1466         }
1467         ret = count;
1468 out:
1469         kfree(dir_buf);
1470         brelse(iloc.bh);
1471         return ret;
1472 }
1473
1474 /*
1475  * So this function is called when the volume is mkfsed with
1476  * dir_index disabled. In order to keep f_pos persistent
1477  * after we convert from an inlined dir to a blocked based,
1478  * we just pretend that we are a normal dir and return the
1479  * offset as if '.' and '..' really take place.
1480  *
1481  */
1482 int ext4_read_inline_dir(struct file *file,
1483                          struct dir_context *ctx,
1484                          int *has_inline_data)
1485 {
1486         unsigned int offset, parent_ino;
1487         int i;
1488         struct ext4_dir_entry_2 *de;
1489         struct super_block *sb;
1490         struct inode *inode = file_inode(file);
1491         int ret, inline_size = 0;
1492         struct ext4_iloc iloc;
1493         void *dir_buf = NULL;
1494         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1495
1496         ret = ext4_get_inode_loc(inode, &iloc);
1497         if (ret)
1498                 return ret;
1499
1500         down_read(&EXT4_I(inode)->xattr_sem);
1501         if (!ext4_has_inline_data(inode)) {
1502                 up_read(&EXT4_I(inode)->xattr_sem);
1503                 *has_inline_data = 0;
1504                 goto out;
1505         }
1506
1507         inline_size = ext4_get_inline_size(inode);
1508         dir_buf = kmalloc(inline_size, GFP_NOFS);
1509         if (!dir_buf) {
1510                 ret = -ENOMEM;
1511                 up_read(&EXT4_I(inode)->xattr_sem);
1512                 goto out;
1513         }
1514
1515         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1516         up_read(&EXT4_I(inode)->xattr_sem);
1517         if (ret < 0)
1518                 goto out;
1519
1520         ret = 0;
1521         sb = inode->i_sb;
1522         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1523         offset = ctx->pos;
1524
1525         /*
1526          * dotdot_offset and dotdot_size is the real offset and
1527          * size for ".." and "." if the dir is block based while
1528          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1529          * So we will use extra_offset and extra_size to indicate them
1530          * during the inline dir iteration.
1531          */
1532         dotdot_offset = ext4_dir_rec_len(1, NULL);
1533         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1534         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1535         extra_size = extra_offset + inline_size;
1536
1537         /*
1538          * If the version has changed since the last call to
1539          * readdir(2), then we might be pointing to an invalid
1540          * dirent right now.  Scan from the start of the inline
1541          * dir to make sure.
1542          */
1543         if (!inode_eq_iversion(inode, file->f_version)) {
1544                 for (i = 0; i < extra_size && i < offset;) {
1545                         /*
1546                          * "." is with offset 0 and
1547                          * ".." is dotdot_offset.
1548                          */
1549                         if (!i) {
1550                                 i = dotdot_offset;
1551                                 continue;
1552                         } else if (i == dotdot_offset) {
1553                                 i = dotdot_size;
1554                                 continue;
1555                         }
1556                         /* for other entry, the real offset in
1557                          * the buf has to be tuned accordingly.
1558                          */
1559                         de = (struct ext4_dir_entry_2 *)
1560                                 (dir_buf + i - extra_offset);
1561                         /* It's too expensive to do a full
1562                          * dirent test each time round this
1563                          * loop, but we do have to test at
1564                          * least that it is non-zero.  A
1565                          * failure will be detected in the
1566                          * dirent test below. */
1567                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1568                                 < ext4_dir_rec_len(1, NULL))
1569                                 break;
1570                         i += ext4_rec_len_from_disk(de->rec_len,
1571                                                     extra_size);
1572                 }
1573                 offset = i;
1574                 ctx->pos = offset;
1575                 file->f_version = inode_query_iversion(inode);
1576         }
1577
1578         while (ctx->pos < extra_size) {
1579                 if (ctx->pos == 0) {
1580                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1581                                 goto out;
1582                         ctx->pos = dotdot_offset;
1583                         continue;
1584                 }
1585
1586                 if (ctx->pos == dotdot_offset) {
1587                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1588                                 goto out;
1589                         ctx->pos = dotdot_size;
1590                         continue;
1591                 }
1592
1593                 de = (struct ext4_dir_entry_2 *)
1594                         (dir_buf + ctx->pos - extra_offset);
1595                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1596                                          extra_size, ctx->pos))
1597                         goto out;
1598                 if (le32_to_cpu(de->inode)) {
1599                         if (!dir_emit(ctx, de->name, de->name_len,
1600                                       le32_to_cpu(de->inode),
1601                                       get_dtype(sb, de->file_type)))
1602                                 goto out;
1603                 }
1604                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1605         }
1606 out:
1607         kfree(dir_buf);
1608         brelse(iloc.bh);
1609         return ret;
1610 }
1611
1612 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1613                                         struct ext4_dir_entry_2 **parent_de,
1614                                         int *retval)
1615 {
1616         struct ext4_iloc iloc;
1617
1618         *retval = ext4_get_inode_loc(inode, &iloc);
1619         if (*retval)
1620                 return NULL;
1621
1622         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1623
1624         return iloc.bh;
1625 }
1626
1627 /*
1628  * Try to create the inline data for the new dir.
1629  * If it succeeds, return 0, otherwise return the error.
1630  * In case of ENOSPC, the caller should create the normal disk layout dir.
1631  */
1632 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1633                                struct inode *inode)
1634 {
1635         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1636         struct ext4_iloc iloc;
1637         struct ext4_dir_entry_2 *de;
1638
1639         ret = ext4_get_inode_loc(inode, &iloc);
1640         if (ret)
1641                 return ret;
1642
1643         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1644         if (ret)
1645                 goto out;
1646
1647         /*
1648          * For inline dir, we only save the inode information for the ".."
1649          * and create a fake dentry to cover the left space.
1650          */
1651         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1652         de->inode = cpu_to_le32(parent->i_ino);
1653         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1654         de->inode = 0;
1655         de->rec_len = ext4_rec_len_to_disk(
1656                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1657                                 inline_size);
1658         set_nlink(inode, 2);
1659         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1660 out:
1661         brelse(iloc.bh);
1662         return ret;
1663 }
1664
1665 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1666                                         struct ext4_filename *fname,
1667                                         struct ext4_dir_entry_2 **res_dir,
1668                                         int *has_inline_data)
1669 {
1670         int ret;
1671         struct ext4_iloc iloc;
1672         void *inline_start;
1673         int inline_size;
1674
1675         if (ext4_get_inode_loc(dir, &iloc))
1676                 return NULL;
1677
1678         down_read(&EXT4_I(dir)->xattr_sem);
1679         if (!ext4_has_inline_data(dir)) {
1680                 *has_inline_data = 0;
1681                 goto out;
1682         }
1683
1684         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1685                                                 EXT4_INLINE_DOTDOT_SIZE;
1686         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1687         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1688                               dir, fname, 0, res_dir);
1689         if (ret == 1)
1690                 goto out_find;
1691         if (ret < 0)
1692                 goto out;
1693
1694         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1695                 goto out;
1696
1697         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1698         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1699
1700         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1701                               dir, fname, 0, res_dir);
1702         if (ret == 1)
1703                 goto out_find;
1704
1705 out:
1706         brelse(iloc.bh);
1707         iloc.bh = NULL;
1708 out_find:
1709         up_read(&EXT4_I(dir)->xattr_sem);
1710         return iloc.bh;
1711 }
1712
1713 int ext4_delete_inline_entry(handle_t *handle,
1714                              struct inode *dir,
1715                              struct ext4_dir_entry_2 *de_del,
1716                              struct buffer_head *bh,
1717                              int *has_inline_data)
1718 {
1719         int err, inline_size, no_expand;
1720         struct ext4_iloc iloc;
1721         void *inline_start;
1722
1723         err = ext4_get_inode_loc(dir, &iloc);
1724         if (err)
1725                 return err;
1726
1727         ext4_write_lock_xattr(dir, &no_expand);
1728         if (!ext4_has_inline_data(dir)) {
1729                 *has_inline_data = 0;
1730                 goto out;
1731         }
1732
1733         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1734                 EXT4_MIN_INLINE_DATA_SIZE) {
1735                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1736                                         EXT4_INLINE_DOTDOT_SIZE;
1737                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1738                                 EXT4_INLINE_DOTDOT_SIZE;
1739         } else {
1740                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1741                 inline_size = ext4_get_inline_size(dir) -
1742                                 EXT4_MIN_INLINE_DATA_SIZE;
1743         }
1744
1745         BUFFER_TRACE(bh, "get_write_access");
1746         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1747                                             EXT4_JTR_NONE);
1748         if (err)
1749                 goto out;
1750
1751         err = ext4_generic_delete_entry(dir, de_del, bh,
1752                                         inline_start, inline_size, 0);
1753         if (err)
1754                 goto out;
1755
1756         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1757 out:
1758         ext4_write_unlock_xattr(dir, &no_expand);
1759         if (likely(err == 0))
1760                 err = ext4_mark_inode_dirty(handle, dir);
1761         brelse(iloc.bh);
1762         if (err != -ENOENT)
1763                 ext4_std_error(dir->i_sb, err);
1764         return err;
1765 }
1766
1767 /*
1768  * Get the inline dentry at offset.
1769  */
1770 static inline struct ext4_dir_entry_2 *
1771 ext4_get_inline_entry(struct inode *inode,
1772                       struct ext4_iloc *iloc,
1773                       unsigned int offset,
1774                       void **inline_start,
1775                       int *inline_size)
1776 {
1777         void *inline_pos;
1778
1779         BUG_ON(offset > ext4_get_inline_size(inode));
1780
1781         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1782                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1783                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1784         } else {
1785                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1786                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1787                 *inline_size = ext4_get_inline_size(inode) -
1788                                 EXT4_MIN_INLINE_DATA_SIZE;
1789         }
1790
1791         if (inline_start)
1792                 *inline_start = inline_pos;
1793         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1794 }
1795
1796 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1797 {
1798         int err, inline_size;
1799         struct ext4_iloc iloc;
1800         size_t inline_len;
1801         void *inline_pos;
1802         unsigned int offset;
1803         struct ext4_dir_entry_2 *de;
1804         bool ret = false;
1805
1806         err = ext4_get_inode_loc(dir, &iloc);
1807         if (err) {
1808                 EXT4_ERROR_INODE_ERR(dir, -err,
1809                                      "error %d getting inode %lu block",
1810                                      err, dir->i_ino);
1811                 return false;
1812         }
1813
1814         down_read(&EXT4_I(dir)->xattr_sem);
1815         if (!ext4_has_inline_data(dir)) {
1816                 *has_inline_data = 0;
1817                 ret = true;
1818                 goto out;
1819         }
1820
1821         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1822         if (!le32_to_cpu(de->inode)) {
1823                 ext4_warning(dir->i_sb,
1824                              "bad inline directory (dir #%lu) - no `..'",
1825                              dir->i_ino);
1826                 goto out;
1827         }
1828
1829         inline_len = ext4_get_inline_size(dir);
1830         offset = EXT4_INLINE_DOTDOT_SIZE;
1831         while (offset < inline_len) {
1832                 de = ext4_get_inline_entry(dir, &iloc, offset,
1833                                            &inline_pos, &inline_size);
1834                 if (ext4_check_dir_entry(dir, NULL, de,
1835                                          iloc.bh, inline_pos,
1836                                          inline_size, offset)) {
1837                         ext4_warning(dir->i_sb,
1838                                      "bad inline directory (dir #%lu) - "
1839                                      "inode %u, rec_len %u, name_len %d"
1840                                      "inline size %d",
1841                                      dir->i_ino, le32_to_cpu(de->inode),
1842                                      le16_to_cpu(de->rec_len), de->name_len,
1843                                      inline_size);
1844                         goto out;
1845                 }
1846                 if (le32_to_cpu(de->inode)) {
1847                         goto out;
1848                 }
1849                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1850         }
1851
1852         ret = true;
1853 out:
1854         up_read(&EXT4_I(dir)->xattr_sem);
1855         brelse(iloc.bh);
1856         return ret;
1857 }
1858
1859 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1860 {
1861         int ret, no_expand;
1862
1863         ext4_write_lock_xattr(inode, &no_expand);
1864         ret = ext4_destroy_inline_data_nolock(handle, inode);
1865         ext4_write_unlock_xattr(inode, &no_expand);
1866
1867         return ret;
1868 }
1869
1870 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1871 {
1872         __u64 addr;
1873         int error = -EAGAIN;
1874         struct ext4_iloc iloc;
1875
1876         down_read(&EXT4_I(inode)->xattr_sem);
1877         if (!ext4_has_inline_data(inode))
1878                 goto out;
1879
1880         error = ext4_get_inode_loc(inode, &iloc);
1881         if (error)
1882                 goto out;
1883
1884         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1885         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1886         addr += offsetof(struct ext4_inode, i_block);
1887
1888         brelse(iloc.bh);
1889
1890         iomap->addr = addr;
1891         iomap->offset = 0;
1892         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1893                               i_size_read(inode));
1894         iomap->type = IOMAP_INLINE;
1895         iomap->flags = 0;
1896
1897 out:
1898         up_read(&EXT4_I(inode)->xattr_sem);
1899         return error;
1900 }
1901
1902 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1903 {
1904         handle_t *handle;
1905         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1906         size_t i_size;
1907         void *value = NULL;
1908         struct ext4_xattr_ibody_find is = {
1909                 .s = { .not_found = -ENODATA, },
1910         };
1911         struct ext4_xattr_info i = {
1912                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1913                 .name = EXT4_XATTR_SYSTEM_DATA,
1914         };
1915
1916
1917         needed_blocks = ext4_writepage_trans_blocks(inode);
1918         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1919         if (IS_ERR(handle))
1920                 return PTR_ERR(handle);
1921
1922         ext4_write_lock_xattr(inode, &no_expand);
1923         if (!ext4_has_inline_data(inode)) {
1924                 ext4_write_unlock_xattr(inode, &no_expand);
1925                 *has_inline = 0;
1926                 ext4_journal_stop(handle);
1927                 return 0;
1928         }
1929
1930         if ((err = ext4_orphan_add(handle, inode)) != 0)
1931                 goto out;
1932
1933         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1934                 goto out;
1935
1936         down_write(&EXT4_I(inode)->i_data_sem);
1937         i_size = inode->i_size;
1938         inline_size = ext4_get_inline_size(inode);
1939         EXT4_I(inode)->i_disksize = i_size;
1940
1941         if (i_size < inline_size) {
1942                 /*
1943                  * if there's inline data to truncate and this file was
1944                  * converted to extents after that inline data was written,
1945                  * the extent status cache must be cleared to avoid leaving
1946                  * behind stale delayed allocated extent entries
1947                  */
1948                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1949 retry:
1950                         err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1951                         if (err == -ENOMEM) {
1952                                 cond_resched();
1953                                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1954                                 goto retry;
1955                         }
1956                         if (err)
1957                                 goto out_error;
1958                 }
1959
1960                 /* Clear the content in the xattr space. */
1961                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1962                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1963                                 goto out_error;
1964
1965                         BUG_ON(is.s.not_found);
1966
1967                         value_len = le32_to_cpu(is.s.here->e_value_size);
1968                         value = kmalloc(value_len, GFP_NOFS);
1969                         if (!value) {
1970                                 err = -ENOMEM;
1971                                 goto out_error;
1972                         }
1973
1974                         err = ext4_xattr_ibody_get(inode, i.name_index,
1975                                                    i.name, value, value_len);
1976                         if (err <= 0)
1977                                 goto out_error;
1978
1979                         i.value = value;
1980                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1981                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1982                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1983                         if (err)
1984                                 goto out_error;
1985                 }
1986
1987                 /* Clear the content within i_blocks. */
1988                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1989                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1990                         memset(p + i_size, 0,
1991                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1992                 }
1993
1994                 EXT4_I(inode)->i_inline_size = i_size <
1995                                         EXT4_MIN_INLINE_DATA_SIZE ?
1996                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1997         }
1998
1999 out_error:
2000         up_write(&EXT4_I(inode)->i_data_sem);
2001 out:
2002         brelse(is.iloc.bh);
2003         ext4_write_unlock_xattr(inode, &no_expand);
2004         kfree(value);
2005         if (inode->i_nlink)
2006                 ext4_orphan_del(handle, inode);
2007
2008         if (err == 0) {
2009                 inode->i_mtime = inode->i_ctime = current_time(inode);
2010                 err = ext4_mark_inode_dirty(handle, inode);
2011                 if (IS_SYNC(inode))
2012                         ext4_handle_sync(handle);
2013         }
2014         ext4_journal_stop(handle);
2015         return err;
2016 }
2017
2018 int ext4_convert_inline_data(struct inode *inode)
2019 {
2020         int error, needed_blocks, no_expand;
2021         handle_t *handle;
2022         struct ext4_iloc iloc;
2023
2024         if (!ext4_has_inline_data(inode)) {
2025                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2026                 return 0;
2027         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2028                 /*
2029                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2030                  * cleared. This means we are in the middle of moving of
2031                  * inline data to delay allocated block. Just force writeout
2032                  * here to finish conversion.
2033                  */
2034                 error = filemap_flush(inode->i_mapping);
2035                 if (error)
2036                         return error;
2037                 if (!ext4_has_inline_data(inode))
2038                         return 0;
2039         }
2040
2041         needed_blocks = ext4_writepage_trans_blocks(inode);
2042
2043         iloc.bh = NULL;
2044         error = ext4_get_inode_loc(inode, &iloc);
2045         if (error)
2046                 return error;
2047
2048         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2049         if (IS_ERR(handle)) {
2050                 error = PTR_ERR(handle);
2051                 goto out_free;
2052         }
2053
2054         ext4_write_lock_xattr(inode, &no_expand);
2055         if (ext4_has_inline_data(inode))
2056                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2057         ext4_write_unlock_xattr(inode, &no_expand);
2058         ext4_journal_stop(handle);
2059 out_free:
2060         brelse(iloc.bh);
2061         return error;
2062 }