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/namei.h>
  10 #include <linux/iversion.h>
  11 #include <linux/sched/mm.h>
  12
  13 #include "ext4_jbd2.h"
  14 #include "ext4.h"
  15 #include "xattr.h"
  16 #include "truncate.h"
  17
  18 #define EXT4_XATTR_SYSTEM_DATA  "data"
  19 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  20 #define EXT4_INLINE_DOTDOT_OFFSET       2
  21 #define EXT4_INLINE_DOTDOT_SIZE         4
  22
  23 static int ext4_get_inline_size(struct inode *inode)
  24 {
  25         if (EXT4_I(inode)->i_inline_off)
  26                 return EXT4_I(inode)->i_inline_size;
  27
  28         return 0;
  29 }
  30
  31 static int get_max_inline_xattr_value_size(struct inode *inode,
  32                                            struct ext4_iloc *iloc)
  33 {
  34         struct ext4_xattr_ibody_header *header;
  35         struct ext4_xattr_entry *entry;
  36         struct ext4_inode *raw_inode;
  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
  61         /* Compute min_offs. */
  62         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  63                 if (!entry->e_value_inum && entry->e_value_size) {
  64                         size_t offs = le16_to_cpu(entry->e_value_offs);
  65                         if (offs < min_offs)
  66                                 min_offs = offs;
  67                 }
  68         }
  69         free = min_offs -
  70                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  71
  72         if (EXT4_I(inode)->i_inline_off) {
  73                 entry = (struct ext4_xattr_entry *)
  74                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  75
  76                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  77                 goto out;
  78         }
  79
  80         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  81
  82         if (free > EXT4_XATTR_ROUND)
  83                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  84         else
  85                 free = 0;
  86
  87 out:
  88         return free;
  89 }
  90
  91 /*
  92  * Get the maximum size we now can store in an inode.
  93  * If we can't find the space for a xattr entry, don't use the space
  94  * of the extents since we have no space to indicate the inline data.
  95  */
  96 int ext4_get_max_inline_size(struct inode *inode)
  97 {
  98         int error, max_inline_size;
  99         struct ext4_iloc iloc;
 100
 101         if (EXT4_I(inode)->i_extra_isize == 0)
 102                 return 0;
 103
 104         error = ext4_get_inode_loc(inode, &iloc);
 105         if (error) {
 106                 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 107                                      "can't get inode location %lu",
 108                                      inode->i_ino);
 109                 return 0;
 110         }
 111
 112         down_read(&EXT4_I(inode)->xattr_sem);
 113         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 114         up_read(&EXT4_I(inode)->xattr_sem);
 115
 116         brelse(iloc.bh);
 117
 118         if (!max_inline_size)
 119                 return 0;
 120
 121         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 122 }
 123
 124 /*
 125  * this function does not take xattr_sem, which is OK because it is
 126  * currently only used in a code path coming form ext4_iget, before
 127  * the new inode has been unlocked
 128  */
 129 int ext4_find_inline_data_nolock(struct inode *inode)
 130 {
 131         struct ext4_xattr_ibody_find is = {
 132                 .s = { .not_found = -ENODATA, },
 133         };
 134         struct ext4_xattr_info i = {
 135                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 136                 .name = EXT4_XATTR_SYSTEM_DATA,
 137         };
 138         int error;
 139
 140         if (EXT4_I(inode)->i_extra_isize == 0)
 141                 return 0;
 142
 143         error = ext4_get_inode_loc(inode, &is.iloc);
 144         if (error)
 145                 return error;
 146
 147         error = ext4_xattr_ibody_find(inode, &i, &is);
 148         if (error)
 149                 goto out;
 150
 151         if (!is.s.not_found) {
 152                 if (is.s.here->e_value_inum) {
 153                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 154                                          "to an external xattr inode");
 155                         error = -EFSCORRUPTED;
 156                         goto out;
 157                 }
 158                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 159                                         (void *)ext4_raw_inode(&is.iloc));
 160                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 161                                 le32_to_cpu(is.s.here->e_value_size);
 162         }
 163 out:
 164         brelse(is.iloc.bh);
 165         return error;
 166 }
 167
 168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 169                                  unsigned int len,
 170                                  struct ext4_iloc *iloc)
 171 {
 172         struct ext4_xattr_entry *entry;
 173         struct ext4_xattr_ibody_header *header;
 174         int cp_len = 0;
 175         struct ext4_inode *raw_inode;
 176
 177         if (!len)
 178                 return 0;
 179
 180         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 181
 182         cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
 183
 184         raw_inode = ext4_raw_inode(iloc);
 185         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 186
 187         len -= cp_len;
 188         buffer += cp_len;
 189
 190         if (!len)
 191                 goto out;
 192
 193         header = IHDR(inode, raw_inode);
 194         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 195                                             EXT4_I(inode)->i_inline_off);
 196         len = min_t(unsigned int, len,
 197                     (unsigned int)le32_to_cpu(entry->e_value_size));
 198
 199         memcpy(buffer,
 200                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 201         cp_len += len;
 202
 203 out:
 204         return cp_len;
 205 }
 206
 207 /*
 208  * write the buffer to the inline inode.
 209  * If 'create' is set, we don't need to do the extra copy in the xattr
 210  * value since it is already handled by ext4_xattr_ibody_set.
 211  * That saves us one memcpy.
 212  */
 213 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 214                                    void *buffer, loff_t pos, unsigned int len)
 215 {
 216         struct ext4_xattr_entry *entry;
 217         struct ext4_xattr_ibody_header *header;
 218         struct ext4_inode *raw_inode;
 219         int cp_len = 0;
 220
 221         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 222                 return;
 223
 224         BUG_ON(!EXT4_I(inode)->i_inline_off);
 225         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 226
 227         raw_inode = ext4_raw_inode(iloc);
 228         buffer += pos;
 229
 230         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 231                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 232                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 233                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 234
 235                 len -= cp_len;
 236                 buffer += cp_len;
 237                 pos += cp_len;
 238         }
 239
 240         if (!len)
 241                 return;
 242
 243         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 244         header = IHDR(inode, raw_inode);
 245         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 246                                             EXT4_I(inode)->i_inline_off);
 247
 248         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 249                buffer, len);
 250 }
 251
 252 static int ext4_create_inline_data(handle_t *handle,
 253                                    struct inode *inode, unsigned len)
 254 {
 255         int error;
 256         void *value = NULL;
 257         struct ext4_xattr_ibody_find is = {
 258                 .s = { .not_found = -ENODATA, },
 259         };
 260         struct ext4_xattr_info i = {
 261                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 262                 .name = EXT4_XATTR_SYSTEM_DATA,
 263         };
 264
 265         error = ext4_get_inode_loc(inode, &is.iloc);
 266         if (error)
 267                 return error;
 268
 269         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 270         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 271                                               EXT4_JTR_NONE);
 272         if (error)
 273                 goto out;
 274
 275         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 276                 value = EXT4_ZERO_XATTR_VALUE;
 277                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 278         } else {
 279                 value = "";
 280                 len = 0;
 281         }
 282
 283         /* Insert the xttr entry. */
 284         i.value = value;
 285         i.value_len = len;
 286
 287         error = ext4_xattr_ibody_find(inode, &i, &is);
 288         if (error)
 289                 goto out;
 290
 291         BUG_ON(!is.s.not_found);
 292
 293         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 294         if (error) {
 295                 if (error == -ENOSPC)
 296                         ext4_clear_inode_state(inode,
 297                                                EXT4_STATE_MAY_INLINE_DATA);
 298                 goto out;
 299         }
 300
 301         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 302                 0, EXT4_MIN_INLINE_DATA_SIZE);
 303
 304         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 305                                       (void *)ext4_raw_inode(&is.iloc));
 306         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 307         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 308         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 309         get_bh(is.iloc.bh);
 310         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 311
 312 out:
 313         brelse(is.iloc.bh);
 314         return error;
 315 }
 316
 317 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 318                                    unsigned int len)
 319 {
 320         int error;
 321         void *value = NULL;
 322         struct ext4_xattr_ibody_find is = {
 323                 .s = { .not_found = -ENODATA, },
 324         };
 325         struct ext4_xattr_info i = {
 326                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 327                 .name = EXT4_XATTR_SYSTEM_DATA,
 328         };
 329
 330         /* If the old space is ok, write the data directly. */
 331         if (len <= EXT4_I(inode)->i_inline_size)
 332                 return 0;
 333
 334         error = ext4_get_inode_loc(inode, &is.iloc);
 335         if (error)
 336                 return error;
 337
 338         error = ext4_xattr_ibody_find(inode, &i, &is);
 339         if (error)
 340                 goto out;
 341
 342         BUG_ON(is.s.not_found);
 343
 344         len -= EXT4_MIN_INLINE_DATA_SIZE;
 345         value = kzalloc(len, GFP_NOFS);
 346         if (!value) {
 347                 error = -ENOMEM;
 348                 goto out;
 349         }
 350
 351         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 352                                      value, len);
 353         if (error == -ENODATA)
 354                 goto out;
 355
 356         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 357         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 358                                               EXT4_JTR_NONE);
 359         if (error)
 360                 goto out;
 361
 362         /* Update the xattr entry. */
 363         i.value = value;
 364         i.value_len = len;
 365
 366         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 367         if (error)
 368                 goto out;
 369
 370         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 371                                       (void *)ext4_raw_inode(&is.iloc));
 372         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 373                                 le32_to_cpu(is.s.here->e_value_size);
 374         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 375         get_bh(is.iloc.bh);
 376         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 377
 378 out:
 379         kfree(value);
 380         brelse(is.iloc.bh);
 381         return error;
 382 }
 383
 384 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 385                                     unsigned int len)
 386 {
 387         int ret, size, no_expand;
 388         struct ext4_inode_info *ei = EXT4_I(inode);
 389
 390         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 391                 return -ENOSPC;
 392
 393         size = ext4_get_max_inline_size(inode);
 394         if (size < len)
 395                 return -ENOSPC;
 396
 397         ext4_write_lock_xattr(inode, &no_expand);
 398
 399         if (ei->i_inline_off)
 400                 ret = ext4_update_inline_data(handle, inode, len);
 401         else
 402                 ret = ext4_create_inline_data(handle, inode, len);
 403
 404         ext4_write_unlock_xattr(inode, &no_expand);
 405         return ret;
 406 }
 407
 408 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 409                                            struct inode *inode)
 410 {
 411         struct ext4_inode_info *ei = EXT4_I(inode);
 412         struct ext4_xattr_ibody_find is = {
 413                 .s = { .not_found = 0, },
 414         };
 415         struct ext4_xattr_info i = {
 416                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 417                 .name = EXT4_XATTR_SYSTEM_DATA,
 418                 .value = NULL,
 419                 .value_len = 0,
 420         };
 421         int error;
 422
 423         if (!ei->i_inline_off)
 424                 return 0;
 425
 426         error = ext4_get_inode_loc(inode, &is.iloc);
 427         if (error)
 428                 return error;
 429
 430         error = ext4_xattr_ibody_find(inode, &i, &is);
 431         if (error)
 432                 goto out;
 433
 434         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 435         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 436                                               EXT4_JTR_NONE);
 437         if (error)
 438                 goto out;
 439
 440         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 441         if (error)
 442                 goto out;
 443
 444         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 445                 0, EXT4_MIN_INLINE_DATA_SIZE);
 446         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 447
 448         if (ext4_has_feature_extents(inode->i_sb)) {
 449                 if (S_ISDIR(inode->i_mode) ||
 450                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 451                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 452                         ext4_ext_tree_init(handle, inode);
 453                 }
 454         }
 455         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 456
 457         get_bh(is.iloc.bh);
 458         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 459
 460         EXT4_I(inode)->i_inline_off = 0;
 461         EXT4_I(inode)->i_inline_size = 0;
 462         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 463 out:
 464         brelse(is.iloc.bh);
 465         if (error == -ENODATA)
 466                 error = 0;
 467         return error;
 468 }
 469
 470 static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
 471 {
 472         void *kaddr;
 473         int ret = 0;
 474         size_t len;
 475         struct ext4_iloc iloc;
 476
 477         BUG_ON(!folio_test_locked(folio));
 478         BUG_ON(!ext4_has_inline_data(inode));
 479         BUG_ON(folio->index);
 480
 481         if (!EXT4_I(inode)->i_inline_off) {
 482                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 483                              inode->i_ino);
 484                 goto out;
 485         }
 486
 487         ret = ext4_get_inode_loc(inode, &iloc);
 488         if (ret)
 489                 goto out;
 490
 491         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 492         BUG_ON(len > PAGE_SIZE);
 493         kaddr = kmap_local_folio(folio, 0);
 494         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 495         flush_dcache_folio(folio);
 496         kunmap_local(kaddr);
 497         folio_zero_segment(folio, len, folio_size(folio));
 498         folio_mark_uptodate(folio);
 499         brelse(iloc.bh);
 500
 501 out:
 502         return ret;
 503 }
 504
 505 int ext4_readpage_inline(struct inode *inode, struct folio *folio)
 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 (!folio->index)
 520                 ret = ext4_read_inline_folio(inode, folio);
 521         else if (!folio_test_uptodate(folio)) {
 522                 folio_zero_segment(folio, 0, folio_size(folio));
 523                 folio_mark_uptodate(folio);
 524         }
 525
 526         up_read(&EXT4_I(inode)->xattr_sem);
 527
 528         folio_unlock(folio);
 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 {
 535         int ret, needed_blocks, no_expand;
 536         handle_t *handle = NULL;
 537         int retries = 0, sem_held = 0;
 538         struct folio *folio = NULL;
 539         unsigned from, to;
 540         struct ext4_iloc iloc;
 541
 542         if (!ext4_has_inline_data(inode)) {
 543                 /*
 544                  * clear the flag so that no new write
 545                  * will trap here again.
 546                  */
 547                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 548                 return 0;
 549         }
 550
 551         needed_blocks = ext4_writepage_trans_blocks(inode);
 552
 553         ret = ext4_get_inode_loc(inode, &iloc);
 554         if (ret)
 555                 return ret;
 556
 557 retry:
 558         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 559         if (IS_ERR(handle)) {
 560                 ret = PTR_ERR(handle);
 561                 handle = NULL;
 562                 goto out;
 563         }
 564
 565         /* We cannot recurse into the filesystem as the transaction is already
 566          * started */
 567         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 568                         mapping_gfp_mask(mapping));
 569         if (IS_ERR(folio)) {
 570                 ret = PTR_ERR(folio);
 571                 goto out_nofolio;
 572         }
 573
 574         ext4_write_lock_xattr(inode, &no_expand);
 575         sem_held = 1;
 576         /* If some one has already done this for us, just exit. */
 577         if (!ext4_has_inline_data(inode)) {
 578                 ret = 0;
 579                 goto out;
 580         }
 581
 582         from = 0;
 583         to = ext4_get_inline_size(inode);
 584         if (!folio_test_uptodate(folio)) {
 585                 ret = ext4_read_inline_folio(inode, folio);
 586                 if (ret < 0)
 587                         goto out;
 588         }
 589
 590         ret = ext4_destroy_inline_data_nolock(handle, inode);
 591         if (ret)
 592                 goto out;
 593
 594         if (ext4_should_dioread_nolock(inode)) {
 595                 ret = __block_write_begin(&folio->page, from, to,
 596                                           ext4_get_block_unwritten);
 597         } else
 598                 ret = __block_write_begin(&folio->page, from, to, ext4_get_block);
 599
 600         if (!ret && ext4_should_journal_data(inode)) {
 601                 ret = ext4_walk_page_buffers(handle, inode,
 602                                              folio_buffers(folio), from, to,
 603                                              NULL, do_journal_get_write_access);
 604         }
 605
 606         if (ret) {
 607                 folio_unlock(folio);
 608                 folio_put(folio);
 609                 folio = NULL;
 610                 ext4_orphan_add(handle, inode);
 611                 ext4_write_unlock_xattr(inode, &no_expand);
 612                 sem_held = 0;
 613                 ext4_journal_stop(handle);
 614                 handle = NULL;
 615                 ext4_truncate_failed_write(inode);
 616                 /*
 617                  * If truncate failed early the inode might
 618                  * still be on the orphan list; we need to
 619                  * make sure the inode is removed from the
 620                  * orphan list in that case.
 621                  */
 622                 if (inode->i_nlink)
 623                         ext4_orphan_del(NULL, inode);
 624         }
 625
 626         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 627                 goto retry;
 628
 629         if (folio)
 630                 block_commit_write(&folio->page, from, to);
 631 out:
 632         if (folio) {
 633                 folio_unlock(folio);
 634                 folio_put(folio);
 635         }
 636 out_nofolio:
 637         if (sem_held)
 638                 ext4_write_unlock_xattr(inode, &no_expand);
 639         if (handle)
 640                 ext4_journal_stop(handle);
 641         brelse(iloc.bh);
 642         return ret;
 643 }
 644
 645 /*
 646  * Try to write data in the inode.
 647  * If the inode has inline data, check whether the new write can be
 648  * in the inode also. If not, create the page the handle, move the data
 649  * to the page make it update and let the later codes create extent for it.
 650  */
 651 int ext4_try_to_write_inline_data(struct address_space *mapping,
 652                                   struct inode *inode,
 653                                   loff_t pos, unsigned len,
 654                                   struct page **pagep)
 655 {
 656         int ret;
 657         handle_t *handle;
 658         struct folio *folio;
 659         struct ext4_iloc iloc;
 660
 661         if (pos + len > ext4_get_max_inline_size(inode))
 662                 goto convert;
 663
 664         ret = ext4_get_inode_loc(inode, &iloc);
 665         if (ret)
 666                 return ret;
 667
 668         /*
 669          * The possible write could happen in the inode,
 670          * so try to reserve the space in inode first.
 671          */
 672         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 673         if (IS_ERR(handle)) {
 674                 ret = PTR_ERR(handle);
 675                 handle = NULL;
 676                 goto out;
 677         }
 678
 679         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 680         if (ret && ret != -ENOSPC)
 681                 goto out;
 682
 683         /* We don't have space in inline inode, so convert it to extent. */
 684         if (ret == -ENOSPC) {
 685                 ext4_journal_stop(handle);
 686                 brelse(iloc.bh);
 687                 goto convert;
 688         }
 689
 690         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 691                                             EXT4_JTR_NONE);
 692         if (ret)
 693                 goto out;
 694
 695         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 696                                         mapping_gfp_mask(mapping));
 697         if (IS_ERR(folio)) {
 698                 ret = PTR_ERR(folio);
 699                 goto out;
 700         }
 701
 702         *pagep = &folio->page;
 703         down_read(&EXT4_I(inode)->xattr_sem);
 704         if (!ext4_has_inline_data(inode)) {
 705                 ret = 0;
 706                 folio_unlock(folio);
 707                 folio_put(folio);
 708                 goto out_up_read;
 709         }
 710
 711         if (!folio_test_uptodate(folio)) {
 712                 ret = ext4_read_inline_folio(inode, folio);
 713                 if (ret < 0) {
 714                         folio_unlock(folio);
 715                         folio_put(folio);
 716                         goto out_up_read;
 717                 }
 718         }
 719
 720         ret = 1;
 721         handle = NULL;
 722 out_up_read:
 723         up_read(&EXT4_I(inode)->xattr_sem);
 724 out:
 725         if (handle && (ret != 1))
 726                 ext4_journal_stop(handle);
 727         brelse(iloc.bh);
 728         return ret;
 729 convert:
 730         return ext4_convert_inline_data_to_extent(mapping, inode);
 731 }
 732
 733 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 734                                unsigned copied, struct page *page)
 735 {
 736         struct folio *folio = page_folio(page);
 737         handle_t *handle = ext4_journal_current_handle();
 738         int no_expand;
 739         void *kaddr;
 740         struct ext4_iloc iloc;
 741         int ret = 0, ret2;
 742
 743         if (unlikely(copied < len) && !folio_test_uptodate(folio))
 744                 copied = 0;
 745
 746         if (likely(copied)) {
 747                 ret = ext4_get_inode_loc(inode, &iloc);
 748                 if (ret) {
 749                         folio_unlock(folio);
 750                         folio_put(folio);
 751                         ext4_std_error(inode->i_sb, ret);
 752                         goto out;
 753                 }
 754                 ext4_write_lock_xattr(inode, &no_expand);
 755                 BUG_ON(!ext4_has_inline_data(inode));
 756
 757                 /*
 758                  * ei->i_inline_off may have changed since
 759                  * ext4_write_begin() called
 760                  * ext4_try_to_write_inline_data()
 761                  */
 762                 (void) ext4_find_inline_data_nolock(inode);
 763
 764                 kaddr = kmap_local_folio(folio, 0);
 765                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 766                 kunmap_local(kaddr);
 767                 folio_mark_uptodate(folio);
 768                 /* clear dirty flag so that writepages wouldn't work for us. */
 769                 folio_clear_dirty(folio);
 770
 771                 ext4_write_unlock_xattr(inode, &no_expand);
 772                 brelse(iloc.bh);
 773
 774                 /*
 775                  * It's important to update i_size while still holding folio
 776                  * lock: page writeout could otherwise come in and zero
 777                  * beyond i_size.
 778                  */
 779                 ext4_update_inode_size(inode, pos + copied);
 780         }
 781         folio_unlock(folio);
 782         folio_put(folio);
 783
 784         /*
 785          * Don't mark the inode dirty under folio lock. First, it unnecessarily
 786          * makes the holding time of folio lock longer. Second, it forces lock
 787          * ordering of folio lock and transaction start for journaling
 788          * filesystems.
 789          */
 790         if (likely(copied))
 791                 mark_inode_dirty(inode);
 792 out:
 793         /*
 794          * If we didn't copy as much data as expected, we need to trim back
 795          * size of xattr containing inline data.
 796          */
 797         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 798                 ext4_orphan_add(handle, inode);
 799
 800         ret2 = ext4_journal_stop(handle);
 801         if (!ret)
 802                 ret = ret2;
 803         if (pos + len > inode->i_size) {
 804                 ext4_truncate_failed_write(inode);
 805                 /*
 806                  * If truncate failed early the inode might still be
 807                  * on the orphan list; we need to make sure the inode
 808                  * is removed from the orphan list in that case.
 809                  */
 810                 if (inode->i_nlink)
 811                         ext4_orphan_del(NULL, inode);
 812         }
 813         return ret ? ret : copied;
 814 }
 815
 816 struct buffer_head *
 817 ext4_journalled_write_inline_data(struct inode *inode,
 818                                   unsigned len,
 819                                   struct page *page)
 820 {
 821         int ret, no_expand;
 822         void *kaddr;
 823         struct ext4_iloc iloc;
 824
 825         ret = ext4_get_inode_loc(inode, &iloc);
 826         if (ret) {
 827                 ext4_std_error(inode->i_sb, ret);
 828                 return NULL;
 829         }
 830
 831         ext4_write_lock_xattr(inode, &no_expand);
 832         kaddr = kmap_atomic(page);
 833         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 834         kunmap_atomic(kaddr);
 835         ext4_write_unlock_xattr(inode, &no_expand);
 836
 837         return iloc.bh;
 838 }
 839
 840 /*
 841  * Try to make the page cache and handle ready for the inline data case.
 842  * We can call this function in 2 cases:
 843  * 1. The inode is created and the first write exceeds inline size. We can
 844  *    clear the inode state safely.
 845  * 2. The inode has inline data, then we need to read the data, make it
 846  *    update and dirty so that ext4_da_writepages can handle it. We don't
 847  *    need to start the journal since the file's metadata isn't changed now.
 848  */
 849 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 850                                                  struct inode *inode,
 851                                                  void **fsdata)
 852 {
 853         int ret = 0, inline_size;
 854         struct folio *folio;
 855
 856         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 857                                         mapping_gfp_mask(mapping));
 858         if (IS_ERR(folio))
 859                 return PTR_ERR(folio);
 860
 861         down_read(&EXT4_I(inode)->xattr_sem);
 862         if (!ext4_has_inline_data(inode)) {
 863                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 864                 goto out;
 865         }
 866
 867         inline_size = ext4_get_inline_size(inode);
 868
 869         if (!folio_test_uptodate(folio)) {
 870                 ret = ext4_read_inline_folio(inode, folio);
 871                 if (ret < 0)
 872                         goto out;
 873         }
 874
 875         ret = __block_write_begin(&folio->page, 0, inline_size,
 876                                   ext4_da_get_block_prep);
 877         if (ret) {
 878                 up_read(&EXT4_I(inode)->xattr_sem);
 879                 folio_unlock(folio);
 880                 folio_put(folio);
 881                 ext4_truncate_failed_write(inode);
 882                 return ret;
 883         }
 884
 885         folio_mark_dirty(folio);
 886         folio_mark_uptodate(folio);
 887         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 888         *fsdata = (void *)CONVERT_INLINE_DATA;
 889
 890 out:
 891         up_read(&EXT4_I(inode)->xattr_sem);
 892         if (folio) {
 893                 folio_unlock(folio);
 894                 folio_put(folio);
 895         }
 896         return ret;
 897 }
 898
 899 /*
 900  * Prepare the write for the inline data.
 901  * If the data can be written into the inode, we just read
 902  * the page and make it uptodate, and start the journal.
 903  * Otherwise read the page, makes it dirty so that it can be
 904  * handle in writepages(the i_disksize update is left to the
 905  * normal ext4_da_write_end).
 906  */
 907 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 908                                     struct inode *inode,
 909                                     loff_t pos, unsigned len,
 910                                     struct page **pagep,
 911                                     void **fsdata)
 912 {
 913         int ret;
 914         handle_t *handle;
 915         struct folio *folio;
 916         struct ext4_iloc iloc;
 917         int retries = 0;
 918
 919         ret = ext4_get_inode_loc(inode, &iloc);
 920         if (ret)
 921                 return ret;
 922
 923 retry_journal:
 924         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 925         if (IS_ERR(handle)) {
 926                 ret = PTR_ERR(handle);
 927                 goto out;
 928         }
 929
 930         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 931         if (ret && ret != -ENOSPC)
 932                 goto out_journal;
 933
 934         if (ret == -ENOSPC) {
 935                 ext4_journal_stop(handle);
 936                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 937                                                             inode,
 938                                                             fsdata);
 939                 if (ret == -ENOSPC &&
 940                     ext4_should_retry_alloc(inode->i_sb, &retries))
 941                         goto retry_journal;
 942                 goto out;
 943         }
 944
 945         /*
 946          * We cannot recurse into the filesystem as the transaction
 947          * is already started.
 948          */
 949         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 950                                         mapping_gfp_mask(mapping));
 951         if (IS_ERR(folio)) {
 952                 ret = PTR_ERR(folio);
 953                 goto out_journal;
 954         }
 955
 956         down_read(&EXT4_I(inode)->xattr_sem);
 957         if (!ext4_has_inline_data(inode)) {
 958                 ret = 0;
 959                 goto out_release_page;
 960         }
 961
 962         if (!folio_test_uptodate(folio)) {
 963                 ret = ext4_read_inline_folio(inode, folio);
 964                 if (ret < 0)
 965                         goto out_release_page;
 966         }
 967         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 968                                             EXT4_JTR_NONE);
 969         if (ret)
 970                 goto out_release_page;
 971
 972         up_read(&EXT4_I(inode)->xattr_sem);
 973         *pagep = &folio->page;
 974         brelse(iloc.bh);
 975         return 1;
 976 out_release_page:
 977         up_read(&EXT4_I(inode)->xattr_sem);
 978         folio_unlock(folio);
 979         folio_put(folio);
 980 out_journal:
 981         ext4_journal_stop(handle);
 982 out:
 983         brelse(iloc.bh);
 984         return ret;
 985 }
 986
 987 #ifdef INLINE_DIR_DEBUG
 988 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 989                           void *inline_start, int inline_size)
 990 {
 991         int offset;
 992         unsigned short de_len;
 993         struct ext4_dir_entry_2 *de = inline_start;
 994         void *dlimit = inline_start + inline_size;
 995
 996         trace_printk("inode %lu\n", dir->i_ino);
 997         offset = 0;
 998         while ((void *)de < dlimit) {
 999                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1000                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1001                              offset, de_len, de->name_len, de->name,
1002                              de->name_len, le32_to_cpu(de->inode));
1003                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1004                                          inline_start, inline_size, offset))
1005                         BUG();
1006
1007                 offset += de_len;
1008                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1009         }
1010 }
1011 #else
1012 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1013 #endif
1014
1015 /*
1016  * Add a new entry into a inline dir.
1017  * It will return -ENOSPC if no space is available, and -EIO
1018  * and -EEXIST if directory entry already exists.
1019  */
1020 static int ext4_add_dirent_to_inline(handle_t *handle,
1021                                      struct ext4_filename *fname,
1022                                      struct inode *dir,
1023                                      struct inode *inode,
1024                                      struct ext4_iloc *iloc,
1025                                      void *inline_start, int inline_size)
1026 {
1027         int             err;
1028         struct ext4_dir_entry_2 *de;
1029
1030         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1031                                 inline_size, fname, &de);
1032         if (err)
1033                 return err;
1034
1035         BUFFER_TRACE(iloc->bh, "get_write_access");
1036         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1037                                             EXT4_JTR_NONE);
1038         if (err)
1039                 return err;
1040         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1041
1042         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1043
1044         /*
1045          * XXX shouldn't update any times until successful
1046          * completion of syscall, but too many callers depend
1047          * on this.
1048          *
1049          * XXX similarly, too many callers depend on
1050          * ext4_new_inode() setting the times, but error
1051          * recovery deletes the inode, so the worst that can
1052          * happen is that the times are slightly out of date
1053          * and/or different from the directory change time.
1054          */
1055         dir->i_mtime = dir->i_ctime = current_time(dir);
1056         ext4_update_dx_flag(dir);
1057         inode_inc_iversion(dir);
1058         return 1;
1059 }
1060
1061 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1062                                        struct ext4_iloc *iloc)
1063 {
1064         struct ext4_xattr_entry *entry;
1065         struct ext4_xattr_ibody_header *header;
1066
1067         BUG_ON(!EXT4_I(inode)->i_inline_off);
1068
1069         header = IHDR(inode, ext4_raw_inode(iloc));
1070         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1071                                             EXT4_I(inode)->i_inline_off);
1072
1073         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1074 }
1075
1076 /* Set the final de to cover the whole block. */
1077 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1078 {
1079         struct ext4_dir_entry_2 *de, *prev_de;
1080         void *limit;
1081         int de_len;
1082
1083         de = de_buf;
1084         if (old_size) {
1085                 limit = de_buf + old_size;
1086                 do {
1087                         prev_de = de;
1088                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1089                         de_buf += de_len;
1090                         de = de_buf;
1091                 } while (de_buf < limit);
1092
1093                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1094                                                         old_size, new_size);
1095         } else {
1096                 /* this is just created, so create an empty entry. */
1097                 de->inode = 0;
1098                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1099         }
1100 }
1101
1102 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1103                                   struct ext4_iloc *iloc)
1104 {
1105         int ret;
1106         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1107         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1108
1109         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1110                 return -ENOSPC;
1111
1112         ret = ext4_update_inline_data(handle, dir,
1113                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1114         if (ret)
1115                 return ret;
1116
1117         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1118                              EXT4_I(dir)->i_inline_size -
1119                                                 EXT4_MIN_INLINE_DATA_SIZE);
1120         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1121         return 0;
1122 }
1123
1124 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1125                                      struct ext4_iloc *iloc,
1126                                      void *buf, int inline_size)
1127 {
1128         int ret;
1129
1130         ret = ext4_create_inline_data(handle, inode, inline_size);
1131         if (ret) {
1132                 ext4_msg(inode->i_sb, KERN_EMERG,
1133                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1134                         inode->i_ino, ret);
1135                 return;
1136         }
1137         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1138         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1139 }
1140
1141 static int ext4_finish_convert_inline_dir(handle_t *handle,
1142                                           struct inode *inode,
1143                                           struct buffer_head *dir_block,
1144                                           void *buf,
1145                                           int inline_size)
1146 {
1147         int err, csum_size = 0, header_size = 0;
1148         struct ext4_dir_entry_2 *de;
1149         void *target = dir_block->b_data;
1150
1151         /*
1152          * First create "." and ".." and then copy the dir information
1153          * back to the block.
1154          */
1155         de = target;
1156         de = ext4_init_dot_dotdot(inode, de,
1157                 inode->i_sb->s_blocksize, csum_size,
1158                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1159         header_size = (void *)de - target;
1160
1161         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1162                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1163
1164         if (ext4_has_metadata_csum(inode->i_sb))
1165                 csum_size = sizeof(struct ext4_dir_entry_tail);
1166
1167         inode->i_size = inode->i_sb->s_blocksize;
1168         i_size_write(inode, inode->i_sb->s_blocksize);
1169         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1170         ext4_update_final_de(dir_block->b_data,
1171                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1172                         inode->i_sb->s_blocksize - csum_size);
1173
1174         if (csum_size)
1175                 ext4_initialize_dirent_tail(dir_block,
1176                                             inode->i_sb->s_blocksize);
1177         set_buffer_uptodate(dir_block);
1178         unlock_buffer(dir_block);
1179         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1180         if (err)
1181                 return err;
1182         set_buffer_verified(dir_block);
1183         return ext4_mark_inode_dirty(handle, inode);
1184 }
1185
1186 static int ext4_convert_inline_data_nolock(handle_t *handle,
1187                                            struct inode *inode,
1188                                            struct ext4_iloc *iloc)
1189 {
1190         int error;
1191         void *buf = NULL;
1192         struct buffer_head *data_bh = NULL;
1193         struct ext4_map_blocks map;
1194         int inline_size;
1195
1196         inline_size = ext4_get_inline_size(inode);
1197         buf = kmalloc(inline_size, GFP_NOFS);
1198         if (!buf) {
1199                 error = -ENOMEM;
1200                 goto out;
1201         }
1202
1203         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1204         if (error < 0)
1205                 goto out;
1206
1207         /*
1208          * Make sure the inline directory entries pass checks before we try to
1209          * convert them, so that we avoid touching stuff that needs fsck.
1210          */
1211         if (S_ISDIR(inode->i_mode)) {
1212                 error = ext4_check_all_de(inode, iloc->bh,
1213                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1214                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1215                 if (error)
1216                         goto out;
1217         }
1218
1219         error = ext4_destroy_inline_data_nolock(handle, inode);
1220         if (error)
1221                 goto out;
1222
1223         map.m_lblk = 0;
1224         map.m_len = 1;
1225         map.m_flags = 0;
1226         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1227         if (error < 0)
1228                 goto out_restore;
1229         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1230                 error = -EIO;
1231                 goto out_restore;
1232         }
1233
1234         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1235         if (!data_bh) {
1236                 error = -ENOMEM;
1237                 goto out_restore;
1238         }
1239
1240         lock_buffer(data_bh);
1241         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1242                                                EXT4_JTR_NONE);
1243         if (error) {
1244                 unlock_buffer(data_bh);
1245                 error = -EIO;
1246                 goto out_restore;
1247         }
1248         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1249
1250         if (!S_ISDIR(inode->i_mode)) {
1251                 memcpy(data_bh->b_data, buf, inline_size);
1252                 set_buffer_uptodate(data_bh);
1253                 unlock_buffer(data_bh);
1254                 error = ext4_handle_dirty_metadata(handle,
1255                                                    inode, data_bh);
1256         } else {
1257                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1258                                                        buf, inline_size);
1259         }
1260
1261 out_restore:
1262         if (error)
1263                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1264
1265 out:
1266         brelse(data_bh);
1267         kfree(buf);
1268         return error;
1269 }
1270
1271 /*
1272  * Try to add the new entry to the inline data.
1273  * If succeeds, return 0. If not, extended the inline dir and copied data to
1274  * the new created block.
1275  */
1276 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1277                               struct inode *dir, struct inode *inode)
1278 {
1279         int ret, ret2, inline_size, no_expand;
1280         void *inline_start;
1281         struct ext4_iloc iloc;
1282
1283         ret = ext4_get_inode_loc(dir, &iloc);
1284         if (ret)
1285                 return ret;
1286
1287         ext4_write_lock_xattr(dir, &no_expand);
1288         if (!ext4_has_inline_data(dir))
1289                 goto out;
1290
1291         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1292                                                  EXT4_INLINE_DOTDOT_SIZE;
1293         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1294
1295         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1296                                         inline_start, inline_size);
1297         if (ret != -ENOSPC)
1298                 goto out;
1299
1300         /* check whether it can be inserted to inline xattr space. */
1301         inline_size = EXT4_I(dir)->i_inline_size -
1302                         EXT4_MIN_INLINE_DATA_SIZE;
1303         if (!inline_size) {
1304                 /* Try to use the xattr space.*/
1305                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1306                 if (ret && ret != -ENOSPC)
1307                         goto out;
1308
1309                 inline_size = EXT4_I(dir)->i_inline_size -
1310                                 EXT4_MIN_INLINE_DATA_SIZE;
1311         }
1312
1313         if (inline_size) {
1314                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1315
1316                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1317                                                 inode, &iloc, inline_start,
1318                                                 inline_size);
1319
1320                 if (ret != -ENOSPC)
1321                         goto out;
1322         }
1323
1324         /*
1325          * The inline space is filled up, so create a new block for it.
1326          * As the extent tree will be created, we have to save the inline
1327          * dir first.
1328          */
1329         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1330
1331 out:
1332         ext4_write_unlock_xattr(dir, &no_expand);
1333         ret2 = ext4_mark_inode_dirty(handle, dir);
1334         if (unlikely(ret2 && !ret))
1335                 ret = ret2;
1336         brelse(iloc.bh);
1337         return ret;
1338 }
1339
1340 /*
1341  * This function fills a red-black tree with information from an
1342  * inlined dir.  It returns the number directory entries loaded
1343  * into the tree.  If there is an error it is returned in err.
1344  */
1345 int ext4_inlinedir_to_tree(struct file *dir_file,
1346                            struct inode *dir, ext4_lblk_t block,
1347                            struct dx_hash_info *hinfo,
1348                            __u32 start_hash, __u32 start_minor_hash,
1349                            int *has_inline_data)
1350 {
1351         int err = 0, count = 0;
1352         unsigned int parent_ino;
1353         int pos;
1354         struct ext4_dir_entry_2 *de;
1355         struct inode *inode = file_inode(dir_file);
1356         int ret, inline_size = 0;
1357         struct ext4_iloc iloc;
1358         void *dir_buf = NULL;
1359         struct ext4_dir_entry_2 fake;
1360         struct fscrypt_str tmp_str;
1361
1362         ret = ext4_get_inode_loc(inode, &iloc);
1363         if (ret)
1364                 return ret;
1365
1366         down_read(&EXT4_I(inode)->xattr_sem);
1367         if (!ext4_has_inline_data(inode)) {
1368                 up_read(&EXT4_I(inode)->xattr_sem);
1369                 *has_inline_data = 0;
1370                 goto out;
1371         }
1372
1373         inline_size = ext4_get_inline_size(inode);
1374         dir_buf = kmalloc(inline_size, GFP_NOFS);
1375         if (!dir_buf) {
1376                 ret = -ENOMEM;
1377                 up_read(&EXT4_I(inode)->xattr_sem);
1378                 goto out;
1379         }
1380
1381         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1382         up_read(&EXT4_I(inode)->xattr_sem);
1383         if (ret < 0)
1384                 goto out;
1385
1386         pos = 0;
1387         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1388         while (pos < inline_size) {
1389                 /*
1390                  * As inlined dir doesn't store any information about '.' and
1391                  * only the inode number of '..' is stored, we have to handle
1392                  * them differently.
1393                  */
1394                 if (pos == 0) {
1395                         fake.inode = cpu_to_le32(inode->i_ino);
1396                         fake.name_len = 1;
1397                         strcpy(fake.name, ".");
1398                         fake.rec_len = ext4_rec_len_to_disk(
1399                                           ext4_dir_rec_len(fake.name_len, NULL),
1400                                           inline_size);
1401                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1402                         de = &fake;
1403                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1404                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1405                         fake.inode = cpu_to_le32(parent_ino);
1406                         fake.name_len = 2;
1407                         strcpy(fake.name, "..");
1408                         fake.rec_len = ext4_rec_len_to_disk(
1409                                           ext4_dir_rec_len(fake.name_len, NULL),
1410                                           inline_size);
1411                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1412                         de = &fake;
1413                         pos = EXT4_INLINE_DOTDOT_SIZE;
1414                 } else {
1415                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1416                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1417                         if (ext4_check_dir_entry(inode, dir_file, de,
1418                                          iloc.bh, dir_buf,
1419                                          inline_size, pos)) {
1420                                 ret = count;
1421                                 goto out;
1422                         }
1423                 }
1424
1425                 if (ext4_hash_in_dirent(dir)) {
1426                         hinfo->hash = EXT4_DIRENT_HASH(de);
1427                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1428                 } else {
1429                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1430                 }
1431                 if ((hinfo->hash < start_hash) ||
1432                     ((hinfo->hash == start_hash) &&
1433                      (hinfo->minor_hash < start_minor_hash)))
1434                         continue;
1435                 if (de->inode == 0)
1436                         continue;
1437                 tmp_str.name = de->name;
1438                 tmp_str.len = de->name_len;
1439                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1440                                               hinfo->minor_hash, de, &tmp_str);
1441                 if (err) {
1442                         ret = err;
1443                         goto out;
1444                 }
1445                 count++;
1446         }
1447         ret = count;
1448 out:
1449         kfree(dir_buf);
1450         brelse(iloc.bh);
1451         return ret;
1452 }
1453
1454 /*
1455  * So this function is called when the volume is mkfsed with
1456  * dir_index disabled. In order to keep f_pos persistent
1457  * after we convert from an inlined dir to a blocked based,
1458  * we just pretend that we are a normal dir and return the
1459  * offset as if '.' and '..' really take place.
1460  *
1461  */
1462 int ext4_read_inline_dir(struct file *file,
1463                          struct dir_context *ctx,
1464                          int *has_inline_data)
1465 {
1466         unsigned int offset, parent_ino;
1467         int i;
1468         struct ext4_dir_entry_2 *de;
1469         struct super_block *sb;
1470         struct inode *inode = file_inode(file);
1471         int ret, inline_size = 0;
1472         struct ext4_iloc iloc;
1473         void *dir_buf = NULL;
1474         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1475
1476         ret = ext4_get_inode_loc(inode, &iloc);
1477         if (ret)
1478                 return ret;
1479
1480         down_read(&EXT4_I(inode)->xattr_sem);
1481         if (!ext4_has_inline_data(inode)) {
1482                 up_read(&EXT4_I(inode)->xattr_sem);
1483                 *has_inline_data = 0;
1484                 goto out;
1485         }
1486
1487         inline_size = ext4_get_inline_size(inode);
1488         dir_buf = kmalloc(inline_size, GFP_NOFS);
1489         if (!dir_buf) {
1490                 ret = -ENOMEM;
1491                 up_read(&EXT4_I(inode)->xattr_sem);
1492                 goto out;
1493         }
1494
1495         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1496         up_read(&EXT4_I(inode)->xattr_sem);
1497         if (ret < 0)
1498                 goto out;
1499
1500         ret = 0;
1501         sb = inode->i_sb;
1502         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1503         offset = ctx->pos;
1504
1505         /*
1506          * dotdot_offset and dotdot_size is the real offset and
1507          * size for ".." and "." if the dir is block based while
1508          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1509          * So we will use extra_offset and extra_size to indicate them
1510          * during the inline dir iteration.
1511          */
1512         dotdot_offset = ext4_dir_rec_len(1, NULL);
1513         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1514         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1515         extra_size = extra_offset + inline_size;
1516
1517         /*
1518          * If the version has changed since the last call to
1519          * readdir(2), then we might be pointing to an invalid
1520          * dirent right now.  Scan from the start of the inline
1521          * dir to make sure.
1522          */
1523         if (!inode_eq_iversion(inode, file->f_version)) {
1524                 for (i = 0; i < extra_size && i < offset;) {
1525                         /*
1526                          * "." is with offset 0 and
1527                          * ".." is dotdot_offset.
1528                          */
1529                         if (!i) {
1530                                 i = dotdot_offset;
1531                                 continue;
1532                         } else if (i == dotdot_offset) {
1533                                 i = dotdot_size;
1534                                 continue;
1535                         }
1536                         /* for other entry, the real offset in
1537                          * the buf has to be tuned accordingly.
1538                          */
1539                         de = (struct ext4_dir_entry_2 *)
1540                                 (dir_buf + i - extra_offset);
1541                         /* It's too expensive to do a full
1542                          * dirent test each time round this
1543                          * loop, but we do have to test at
1544                          * least that it is non-zero.  A
1545                          * failure will be detected in the
1546                          * dirent test below. */
1547                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1548                                 < ext4_dir_rec_len(1, NULL))
1549                                 break;
1550                         i += ext4_rec_len_from_disk(de->rec_len,
1551                                                     extra_size);
1552                 }
1553                 offset = i;
1554                 ctx->pos = offset;
1555                 file->f_version = inode_query_iversion(inode);
1556         }
1557
1558         while (ctx->pos < extra_size) {
1559                 if (ctx->pos == 0) {
1560                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1561                                 goto out;
1562                         ctx->pos = dotdot_offset;
1563                         continue;
1564                 }
1565
1566                 if (ctx->pos == dotdot_offset) {
1567                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1568                                 goto out;
1569                         ctx->pos = dotdot_size;
1570                         continue;
1571                 }
1572
1573                 de = (struct ext4_dir_entry_2 *)
1574                         (dir_buf + ctx->pos - extra_offset);
1575                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1576                                          extra_size, ctx->pos))
1577                         goto out;
1578                 if (le32_to_cpu(de->inode)) {
1579                         if (!dir_emit(ctx, de->name, de->name_len,
1580                                       le32_to_cpu(de->inode),
1581                                       get_dtype(sb, de->file_type)))
1582                                 goto out;
1583                 }
1584                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1585         }
1586 out:
1587         kfree(dir_buf);
1588         brelse(iloc.bh);
1589         return ret;
1590 }
1591
1592 void *ext4_read_inline_link(struct inode *inode)
1593 {
1594         struct ext4_iloc iloc;
1595         int ret, inline_size;
1596         void *link;
1597
1598         ret = ext4_get_inode_loc(inode, &iloc);
1599         if (ret)
1600                 return ERR_PTR(ret);
1601
1602         ret = -ENOMEM;
1603         inline_size = ext4_get_inline_size(inode);
1604         link = kmalloc(inline_size + 1, GFP_NOFS);
1605         if (!link)
1606                 goto out;
1607
1608         ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1609         if (ret < 0) {
1610                 kfree(link);
1611                 goto out;
1612         }
1613         nd_terminate_link(link, inode->i_size, ret);
1614 out:
1615         if (ret < 0)
1616                 link = ERR_PTR(ret);
1617         brelse(iloc.bh);
1618         return link;
1619 }
1620
1621 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1622                                         struct ext4_dir_entry_2 **parent_de,
1623                                         int *retval)
1624 {
1625         struct ext4_iloc iloc;
1626
1627         *retval = ext4_get_inode_loc(inode, &iloc);
1628         if (*retval)
1629                 return NULL;
1630
1631         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1632
1633         return iloc.bh;
1634 }
1635
1636 /*
1637  * Try to create the inline data for the new dir.
1638  * If it succeeds, return 0, otherwise return the error.
1639  * In case of ENOSPC, the caller should create the normal disk layout dir.
1640  */
1641 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1642                                struct inode *inode)
1643 {
1644         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1645         struct ext4_iloc iloc;
1646         struct ext4_dir_entry_2 *de;
1647
1648         ret = ext4_get_inode_loc(inode, &iloc);
1649         if (ret)
1650                 return ret;
1651
1652         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1653         if (ret)
1654                 goto out;
1655
1656         /*
1657          * For inline dir, we only save the inode information for the ".."
1658          * and create a fake dentry to cover the left space.
1659          */
1660         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1661         de->inode = cpu_to_le32(parent->i_ino);
1662         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1663         de->inode = 0;
1664         de->rec_len = ext4_rec_len_to_disk(
1665                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1666                                 inline_size);
1667         set_nlink(inode, 2);
1668         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1669 out:
1670         brelse(iloc.bh);
1671         return ret;
1672 }
1673
1674 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1675                                         struct ext4_filename *fname,
1676                                         struct ext4_dir_entry_2 **res_dir,
1677                                         int *has_inline_data)
1678 {
1679         int ret;
1680         struct ext4_iloc iloc;
1681         void *inline_start;
1682         int inline_size;
1683
1684         if (ext4_get_inode_loc(dir, &iloc))
1685                 return NULL;
1686
1687         down_read(&EXT4_I(dir)->xattr_sem);
1688         if (!ext4_has_inline_data(dir)) {
1689                 *has_inline_data = 0;
1690                 goto out;
1691         }
1692
1693         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1694                                                 EXT4_INLINE_DOTDOT_SIZE;
1695         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1696         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1697                               dir, fname, 0, res_dir);
1698         if (ret == 1)
1699                 goto out_find;
1700         if (ret < 0)
1701                 goto out;
1702
1703         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1704                 goto out;
1705
1706         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1707         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1708
1709         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1710                               dir, fname, 0, res_dir);
1711         if (ret == 1)
1712                 goto out_find;
1713
1714 out:
1715         brelse(iloc.bh);
1716         iloc.bh = NULL;
1717 out_find:
1718         up_read(&EXT4_I(dir)->xattr_sem);
1719         return iloc.bh;
1720 }
1721
1722 int ext4_delete_inline_entry(handle_t *handle,
1723                              struct inode *dir,
1724                              struct ext4_dir_entry_2 *de_del,
1725                              struct buffer_head *bh,
1726                              int *has_inline_data)
1727 {
1728         int err, inline_size, no_expand;
1729         struct ext4_iloc iloc;
1730         void *inline_start;
1731
1732         err = ext4_get_inode_loc(dir, &iloc);
1733         if (err)
1734                 return err;
1735
1736         ext4_write_lock_xattr(dir, &no_expand);
1737         if (!ext4_has_inline_data(dir)) {
1738                 *has_inline_data = 0;
1739                 goto out;
1740         }
1741
1742         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1743                 EXT4_MIN_INLINE_DATA_SIZE) {
1744                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1745                                         EXT4_INLINE_DOTDOT_SIZE;
1746                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1747                                 EXT4_INLINE_DOTDOT_SIZE;
1748         } else {
1749                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1750                 inline_size = ext4_get_inline_size(dir) -
1751                                 EXT4_MIN_INLINE_DATA_SIZE;
1752         }
1753
1754         BUFFER_TRACE(bh, "get_write_access");
1755         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1756                                             EXT4_JTR_NONE);
1757         if (err)
1758                 goto out;
1759
1760         err = ext4_generic_delete_entry(dir, de_del, bh,
1761                                         inline_start, inline_size, 0);
1762         if (err)
1763                 goto out;
1764
1765         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1766 out:
1767         ext4_write_unlock_xattr(dir, &no_expand);
1768         if (likely(err == 0))
1769                 err = ext4_mark_inode_dirty(handle, dir);
1770         brelse(iloc.bh);
1771         if (err != -ENOENT)
1772                 ext4_std_error(dir->i_sb, err);
1773         return err;
1774 }
1775
1776 /*
1777  * Get the inline dentry at offset.
1778  */
1779 static inline struct ext4_dir_entry_2 *
1780 ext4_get_inline_entry(struct inode *inode,
1781                       struct ext4_iloc *iloc,
1782                       unsigned int offset,
1783                       void **inline_start,
1784                       int *inline_size)
1785 {
1786         void *inline_pos;
1787
1788         BUG_ON(offset > ext4_get_inline_size(inode));
1789
1790         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1791                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1792                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1793         } else {
1794                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1795                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1796                 *inline_size = ext4_get_inline_size(inode) -
1797                                 EXT4_MIN_INLINE_DATA_SIZE;
1798         }
1799
1800         if (inline_start)
1801                 *inline_start = inline_pos;
1802         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1803 }
1804
1805 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1806 {
1807         int err, inline_size;
1808         struct ext4_iloc iloc;
1809         size_t inline_len;
1810         void *inline_pos;
1811         unsigned int offset;
1812         struct ext4_dir_entry_2 *de;
1813         bool ret = false;
1814
1815         err = ext4_get_inode_loc(dir, &iloc);
1816         if (err) {
1817                 EXT4_ERROR_INODE_ERR(dir, -err,
1818                                      "error %d getting inode %lu block",
1819                                      err, dir->i_ino);
1820                 return false;
1821         }
1822
1823         down_read(&EXT4_I(dir)->xattr_sem);
1824         if (!ext4_has_inline_data(dir)) {
1825                 *has_inline_data = 0;
1826                 ret = true;
1827                 goto out;
1828         }
1829
1830         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1831         if (!le32_to_cpu(de->inode)) {
1832                 ext4_warning(dir->i_sb,
1833                              "bad inline directory (dir #%lu) - no `..'",
1834                              dir->i_ino);
1835                 goto out;
1836         }
1837
1838         inline_len = ext4_get_inline_size(dir);
1839         offset = EXT4_INLINE_DOTDOT_SIZE;
1840         while (offset < inline_len) {
1841                 de = ext4_get_inline_entry(dir, &iloc, offset,
1842                                            &inline_pos, &inline_size);
1843                 if (ext4_check_dir_entry(dir, NULL, de,
1844                                          iloc.bh, inline_pos,
1845                                          inline_size, offset)) {
1846                         ext4_warning(dir->i_sb,
1847                                      "bad inline directory (dir #%lu) - "
1848                                      "inode %u, rec_len %u, name_len %d"
1849                                      "inline size %d",
1850                                      dir->i_ino, le32_to_cpu(de->inode),
1851                                      le16_to_cpu(de->rec_len), de->name_len,
1852                                      inline_size);
1853                         goto out;
1854                 }
1855                 if (le32_to_cpu(de->inode)) {
1856                         goto out;
1857                 }
1858                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1859         }
1860
1861         ret = true;
1862 out:
1863         up_read(&EXT4_I(dir)->xattr_sem);
1864         brelse(iloc.bh);
1865         return ret;
1866 }
1867
1868 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1869 {
1870         int ret, no_expand;
1871
1872         ext4_write_lock_xattr(inode, &no_expand);
1873         ret = ext4_destroy_inline_data_nolock(handle, inode);
1874         ext4_write_unlock_xattr(inode, &no_expand);
1875
1876         return ret;
1877 }
1878
1879 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1880 {
1881         __u64 addr;
1882         int error = -EAGAIN;
1883         struct ext4_iloc iloc;
1884
1885         down_read(&EXT4_I(inode)->xattr_sem);
1886         if (!ext4_has_inline_data(inode))
1887                 goto out;
1888
1889         error = ext4_get_inode_loc(inode, &iloc);
1890         if (error)
1891                 goto out;
1892
1893         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1894         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1895         addr += offsetof(struct ext4_inode, i_block);
1896
1897         brelse(iloc.bh);
1898
1899         iomap->addr = addr;
1900         iomap->offset = 0;
1901         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1902                               i_size_read(inode));
1903         iomap->type = IOMAP_INLINE;
1904         iomap->flags = 0;
1905
1906 out:
1907         up_read(&EXT4_I(inode)->xattr_sem);
1908         return error;
1909 }
1910
1911 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1912 {
1913         handle_t *handle;
1914         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1915         size_t i_size;
1916         void *value = NULL;
1917         struct ext4_xattr_ibody_find is = {
1918                 .s = { .not_found = -ENODATA, },
1919         };
1920         struct ext4_xattr_info i = {
1921                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1922                 .name = EXT4_XATTR_SYSTEM_DATA,
1923         };
1924
1925
1926         needed_blocks = ext4_writepage_trans_blocks(inode);
1927         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1928         if (IS_ERR(handle))
1929                 return PTR_ERR(handle);
1930
1931         ext4_write_lock_xattr(inode, &no_expand);
1932         if (!ext4_has_inline_data(inode)) {
1933                 ext4_write_unlock_xattr(inode, &no_expand);
1934                 *has_inline = 0;
1935                 ext4_journal_stop(handle);
1936                 return 0;
1937         }
1938
1939         if ((err = ext4_orphan_add(handle, inode)) != 0)
1940                 goto out;
1941
1942         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1943                 goto out;
1944
1945         down_write(&EXT4_I(inode)->i_data_sem);
1946         i_size = inode->i_size;
1947         inline_size = ext4_get_inline_size(inode);
1948         EXT4_I(inode)->i_disksize = i_size;
1949
1950         if (i_size < inline_size) {
1951                 /*
1952                  * if there's inline data to truncate and this file was
1953                  * converted to extents after that inline data was written,
1954                  * the extent status cache must be cleared to avoid leaving
1955                  * behind stale delayed allocated extent entries
1956                  */
1957                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1958 retry:
1959                         err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1960                         if (err == -ENOMEM) {
1961                                 memalloc_retry_wait(GFP_ATOMIC);
1962                                 goto retry;
1963                         }
1964                         if (err)
1965                                 goto out_error;
1966                 }
1967
1968                 /* Clear the content in the xattr space. */
1969                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1970                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1971                                 goto out_error;
1972
1973                         BUG_ON(is.s.not_found);
1974
1975                         value_len = le32_to_cpu(is.s.here->e_value_size);
1976                         value = kmalloc(value_len, GFP_NOFS);
1977                         if (!value) {
1978                                 err = -ENOMEM;
1979                                 goto out_error;
1980                         }
1981
1982                         err = ext4_xattr_ibody_get(inode, i.name_index,
1983                                                    i.name, value, value_len);
1984                         if (err <= 0)
1985                                 goto out_error;
1986
1987                         i.value = value;
1988                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1989                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1990                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1991                         if (err)
1992                                 goto out_error;
1993                 }
1994
1995                 /* Clear the content within i_blocks. */
1996                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1997                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1998                         memset(p + i_size, 0,
1999                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
2000                 }
2001
2002                 EXT4_I(inode)->i_inline_size = i_size <
2003                                         EXT4_MIN_INLINE_DATA_SIZE ?
2004                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2005         }
2006
2007 out_error:
2008         up_write(&EXT4_I(inode)->i_data_sem);
2009 out:
2010         brelse(is.iloc.bh);
2011         ext4_write_unlock_xattr(inode, &no_expand);
2012         kfree(value);
2013         if (inode->i_nlink)
2014                 ext4_orphan_del(handle, inode);
2015
2016         if (err == 0) {
2017                 inode->i_mtime = inode->i_ctime = current_time(inode);
2018                 err = ext4_mark_inode_dirty(handle, inode);
2019                 if (IS_SYNC(inode))
2020                         ext4_handle_sync(handle);
2021         }
2022         ext4_journal_stop(handle);
2023         return err;
2024 }
2025
2026 int ext4_convert_inline_data(struct inode *inode)
2027 {
2028         int error, needed_blocks, no_expand;
2029         handle_t *handle;
2030         struct ext4_iloc iloc;
2031
2032         if (!ext4_has_inline_data(inode)) {
2033                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2034                 return 0;
2035         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2036                 /*
2037                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2038                  * cleared. This means we are in the middle of moving of
2039                  * inline data to delay allocated block. Just force writeout
2040                  * here to finish conversion.
2041                  */
2042                 error = filemap_flush(inode->i_mapping);
2043                 if (error)
2044                         return error;
2045                 if (!ext4_has_inline_data(inode))
2046                         return 0;
2047         }
2048
2049         needed_blocks = ext4_writepage_trans_blocks(inode);
2050
2051         iloc.bh = NULL;
2052         error = ext4_get_inode_loc(inode, &iloc);
2053         if (error)
2054                 return error;
2055
2056         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2057         if (IS_ERR(handle)) {
2058                 error = PTR_ERR(handle);
2059                 goto out_free;
2060         }
2061
2062         ext4_write_lock_xattr(inode, &no_expand);
2063         if (ext4_has_inline_data(inode))
2064                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2065         ext4_write_unlock_xattr(inode, &no_expand);
2066         ext4_journal_stop(handle);
2067 out_free:
2068         brelse(iloc.bh);
2069         return error;
2070 }