fs/ext4/inline.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (c) 2012 Taobao.
   4  * Written by Tao Ma <[email protected]>
   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         void *end;
  38         int free, min_offs;
  39
  40         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  41                 return 0;
  42
  43         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  44                         EXT4_GOOD_OLD_INODE_SIZE -
  45                         EXT4_I(inode)->i_extra_isize -
  46                         sizeof(struct ext4_xattr_ibody_header);
  47
  48         /*
  49          * We need to subtract another sizeof(__u32) since an in-inode xattr
  50          * needs an empty 4 bytes to indicate the gap between the xattr entry
  51          * and the name/value pair.
  52          */
  53         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  54                 return EXT4_XATTR_SIZE(min_offs -
  55                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  56                         EXT4_XATTR_ROUND - sizeof(__u32));
  57
  58         raw_inode = ext4_raw_inode(iloc);
  59         header = IHDR(inode, raw_inode);
  60         entry = IFIRST(header);
  61         end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  62
  63         /* Compute min_offs. */
  64         while (!IS_LAST_ENTRY(entry)) {
  65                 void *next = EXT4_XATTR_NEXT(entry);
  66
  67                 if (next >= end) {
  68                         EXT4_ERROR_INODE(inode,
  69                                          "corrupt xattr in inline inode");
  70                         return 0;
  71                 }
  72                 if (!entry->e_value_inum && entry->e_value_size) {
  73                         size_t offs = le16_to_cpu(entry->e_value_offs);
  74                         if (offs < min_offs)
  75                                 min_offs = offs;
  76                 }
  77                 entry = next;
  78         }
  79         free = min_offs -
  80                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  81
  82         if (EXT4_I(inode)->i_inline_off) {
  83                 entry = (struct ext4_xattr_entry *)
  84                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  85
  86                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  87                 goto out;
  88         }
  89
  90         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  91
  92         if (free > EXT4_XATTR_ROUND)
  93                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  94         else
  95                 free = 0;
  96
  97 out:
  98         return free;
  99 }
 100
 101 /*
 102  * Get the maximum size we now can store in an inode.
 103  * If we can't find the space for a xattr entry, don't use the space
 104  * of the extents since we have no space to indicate the inline data.
 105  */
 106 int ext4_get_max_inline_size(struct inode *inode)
 107 {
 108         int error, max_inline_size;
 109         struct ext4_iloc iloc;
 110
 111         if (EXT4_I(inode)->i_extra_isize == 0)
 112                 return 0;
 113
 114         error = ext4_get_inode_loc(inode, &iloc);
 115         if (error) {
 116                 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 117                                      "can't get inode location %lu",
 118                                      inode->i_ino);
 119                 return 0;
 120         }
 121
 122         down_read(&EXT4_I(inode)->xattr_sem);
 123         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 124         up_read(&EXT4_I(inode)->xattr_sem);
 125
 126         brelse(iloc.bh);
 127
 128         if (!max_inline_size)
 129                 return 0;
 130
 131         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 132 }
 133
 134 /*
 135  * this function does not take xattr_sem, which is OK because it is
 136  * currently only used in a code path coming form ext4_iget, before
 137  * the new inode has been unlocked
 138  */
 139 int ext4_find_inline_data_nolock(struct inode *inode)
 140 {
 141         struct ext4_xattr_ibody_find is = {
 142                 .s = { .not_found = -ENODATA, },
 143         };
 144         struct ext4_xattr_info i = {
 145                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 146                 .name = EXT4_XATTR_SYSTEM_DATA,
 147         };
 148         int error;
 149
 150         if (EXT4_I(inode)->i_extra_isize == 0)
 151                 return 0;
 152
 153         error = ext4_get_inode_loc(inode, &is.iloc);
 154         if (error)
 155                 return error;
 156
 157         error = ext4_xattr_ibody_find(inode, &i, &is);
 158         if (error)
 159                 goto out;
 160
 161         if (!is.s.not_found) {
 162                 if (is.s.here->e_value_inum) {
 163                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 164                                          "to an external xattr inode");
 165                         error = -EFSCORRUPTED;
 166                         goto out;
 167                 }
 168                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 169                                         (void *)ext4_raw_inode(&is.iloc));
 170                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 171                                 le32_to_cpu(is.s.here->e_value_size);
 172         }
 173 out:
 174         brelse(is.iloc.bh);
 175         return error;
 176 }
 177
 178 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 179                                  unsigned int len,
 180                                  struct ext4_iloc *iloc)
 181 {
 182         struct ext4_xattr_entry *entry;
 183         struct ext4_xattr_ibody_header *header;
 184         int cp_len = 0;
 185         struct ext4_inode *raw_inode;
 186
 187         if (!len)
 188                 return 0;
 189
 190         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 191
 192         cp_len = min_t(unsigned int, 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(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_folio(struct inode *inode, struct folio *folio)
 481 {
 482         void *kaddr;
 483         int ret = 0;
 484         size_t len;
 485         struct ext4_iloc iloc;
 486
 487         BUG_ON(!folio_test_locked(folio));
 488         BUG_ON(!ext4_has_inline_data(inode));
 489         BUG_ON(folio->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         BUG_ON(len > PAGE_SIZE);
 503         kaddr = kmap_local_folio(folio, 0);
 504         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 505         kaddr = folio_zero_tail(folio, len, kaddr + len);
 506         kunmap_local(kaddr);
 507         folio_mark_uptodate(folio);
 508         brelse(iloc.bh);
 509
 510 out:
 511         return ret;
 512 }
 513
 514 int ext4_readpage_inline(struct inode *inode, struct folio *folio)
 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 (!folio->index)
 529                 ret = ext4_read_inline_folio(inode, folio);
 530         else if (!folio_test_uptodate(folio)) {
 531                 folio_zero_segment(folio, 0, folio_size(folio));
 532                 folio_mark_uptodate(folio);
 533         }
 534
 535         up_read(&EXT4_I(inode)->xattr_sem);
 536
 537         folio_unlock(folio);
 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 {
 544         int ret, needed_blocks, no_expand;
 545         handle_t *handle = NULL;
 546         int retries = 0, sem_held = 0;
 547         struct folio *folio = NULL;
 548         unsigned from, to;
 549         struct ext4_iloc iloc;
 550
 551         if (!ext4_has_inline_data(inode)) {
 552                 /*
 553                  * clear the flag so that no new write
 554                  * will trap here again.
 555                  */
 556                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 557                 return 0;
 558         }
 559
 560         needed_blocks = ext4_writepage_trans_blocks(inode);
 561
 562         ret = ext4_get_inode_loc(inode, &iloc);
 563         if (ret)
 564                 return ret;
 565
 566 retry:
 567         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 568         if (IS_ERR(handle)) {
 569                 ret = PTR_ERR(handle);
 570                 handle = NULL;
 571                 goto out;
 572         }
 573
 574         /* We cannot recurse into the filesystem as the transaction is already
 575          * started */
 576         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 577                         mapping_gfp_mask(mapping));
 578         if (IS_ERR(folio)) {
 579                 ret = PTR_ERR(folio);
 580                 goto out_nofolio;
 581         }
 582
 583         ext4_write_lock_xattr(inode, &no_expand);
 584         sem_held = 1;
 585         /* If some one has already done this for us, just exit. */
 586         if (!ext4_has_inline_data(inode)) {
 587                 ret = 0;
 588                 goto out;
 589         }
 590
 591         from = 0;
 592         to = ext4_get_inline_size(inode);
 593         if (!folio_test_uptodate(folio)) {
 594                 ret = ext4_read_inline_folio(inode, folio);
 595                 if (ret < 0)
 596                         goto out;
 597         }
 598
 599         ret = ext4_destroy_inline_data_nolock(handle, inode);
 600         if (ret)
 601                 goto out;
 602
 603         if (ext4_should_dioread_nolock(inode)) {
 604                 ret = __block_write_begin(&folio->page, from, to,
 605                                           ext4_get_block_unwritten);
 606         } else
 607                 ret = __block_write_begin(&folio->page, from, to, ext4_get_block);
 608
 609         if (!ret && ext4_should_journal_data(inode)) {
 610                 ret = ext4_walk_page_buffers(handle, inode,
 611                                              folio_buffers(folio), from, to,
 612                                              NULL, do_journal_get_write_access);
 613         }
 614
 615         if (ret) {
 616                 folio_unlock(folio);
 617                 folio_put(folio);
 618                 folio = NULL;
 619                 ext4_orphan_add(handle, inode);
 620                 ext4_write_unlock_xattr(inode, &no_expand);
 621                 sem_held = 0;
 622                 ext4_journal_stop(handle);
 623                 handle = NULL;
 624                 ext4_truncate_failed_write(inode);
 625                 /*
 626                  * If truncate failed early the inode might
 627                  * still be on the orphan list; we need to
 628                  * make sure the inode is removed from the
 629                  * orphan list in that case.
 630                  */
 631                 if (inode->i_nlink)
 632                         ext4_orphan_del(NULL, inode);
 633         }
 634
 635         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 636                 goto retry;
 637
 638         if (folio)
 639                 block_commit_write(&folio->page, from, to);
 640 out:
 641         if (folio) {
 642                 folio_unlock(folio);
 643                 folio_put(folio);
 644         }
 645 out_nofolio:
 646         if (sem_held)
 647                 ext4_write_unlock_xattr(inode, &no_expand);
 648         if (handle)
 649                 ext4_journal_stop(handle);
 650         brelse(iloc.bh);
 651         return ret;
 652 }
 653
 654 /*
 655  * Try to write data in the inode.
 656  * If the inode has inline data, check whether the new write can be
 657  * in the inode also. If not, create the page the handle, move the data
 658  * to the page make it update and let the later codes create extent for it.
 659  */
 660 int ext4_try_to_write_inline_data(struct address_space *mapping,
 661                                   struct inode *inode,
 662                                   loff_t pos, unsigned len,
 663                                   struct page **pagep)
 664 {
 665         int ret;
 666         handle_t *handle;
 667         struct folio *folio;
 668         struct ext4_iloc iloc;
 669
 670         if (pos + len > ext4_get_max_inline_size(inode))
 671                 goto convert;
 672
 673         ret = ext4_get_inode_loc(inode, &iloc);
 674         if (ret)
 675                 return ret;
 676
 677         /*
 678          * The possible write could happen in the inode,
 679          * so try to reserve the space in inode first.
 680          */
 681         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 682         if (IS_ERR(handle)) {
 683                 ret = PTR_ERR(handle);
 684                 handle = NULL;
 685                 goto out;
 686         }
 687
 688         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 689         if (ret && ret != -ENOSPC)
 690                 goto out;
 691
 692         /* We don't have space in inline inode, so convert it to extent. */
 693         if (ret == -ENOSPC) {
 694                 ext4_journal_stop(handle);
 695                 brelse(iloc.bh);
 696                 goto convert;
 697         }
 698
 699         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 700                                             EXT4_JTR_NONE);
 701         if (ret)
 702                 goto out;
 703
 704         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 705                                         mapping_gfp_mask(mapping));
 706         if (IS_ERR(folio)) {
 707                 ret = PTR_ERR(folio);
 708                 goto out;
 709         }
 710
 711         *pagep = &folio->page;
 712         down_read(&EXT4_I(inode)->xattr_sem);
 713         if (!ext4_has_inline_data(inode)) {
 714                 ret = 0;
 715                 folio_unlock(folio);
 716                 folio_put(folio);
 717                 goto out_up_read;
 718         }
 719
 720         if (!folio_test_uptodate(folio)) {
 721                 ret = ext4_read_inline_folio(inode, folio);
 722                 if (ret < 0) {
 723                         folio_unlock(folio);
 724                         folio_put(folio);
 725                         goto out_up_read;
 726                 }
 727         }
 728
 729         ret = 1;
 730         handle = NULL;
 731 out_up_read:
 732         up_read(&EXT4_I(inode)->xattr_sem);
 733 out:
 734         if (handle && (ret != 1))
 735                 ext4_journal_stop(handle);
 736         brelse(iloc.bh);
 737         return ret;
 738 convert:
 739         return ext4_convert_inline_data_to_extent(mapping, inode);
 740 }
 741
 742 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 743                                unsigned copied, struct folio *folio)
 744 {
 745         handle_t *handle = ext4_journal_current_handle();
 746         int no_expand;
 747         void *kaddr;
 748         struct ext4_iloc iloc;
 749         int ret = 0, ret2;
 750
 751         if (unlikely(copied < len) && !folio_test_uptodate(folio))
 752                 copied = 0;
 753
 754         if (likely(copied)) {
 755                 ret = ext4_get_inode_loc(inode, &iloc);
 756                 if (ret) {
 757                         folio_unlock(folio);
 758                         folio_put(folio);
 759                         ext4_std_error(inode->i_sb, ret);
 760                         goto out;
 761                 }
 762                 ext4_write_lock_xattr(inode, &no_expand);
 763                 BUG_ON(!ext4_has_inline_data(inode));
 764
 765                 /*
 766                  * ei->i_inline_off may have changed since
 767                  * ext4_write_begin() called
 768                  * ext4_try_to_write_inline_data()
 769                  */
 770                 (void) ext4_find_inline_data_nolock(inode);
 771
 772                 kaddr = kmap_local_folio(folio, 0);
 773                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 774                 kunmap_local(kaddr);
 775                 folio_mark_uptodate(folio);
 776                 /* clear dirty flag so that writepages wouldn't work for us. */
 777                 folio_clear_dirty(folio);
 778
 779                 ext4_write_unlock_xattr(inode, &no_expand);
 780                 brelse(iloc.bh);
 781
 782                 /*
 783                  * It's important to update i_size while still holding folio
 784                  * lock: page writeout could otherwise come in and zero
 785                  * beyond i_size.
 786                  */
 787                 ext4_update_inode_size(inode, pos + copied);
 788         }
 789         folio_unlock(folio);
 790         folio_put(folio);
 791
 792         /*
 793          * Don't mark the inode dirty under folio lock. First, it unnecessarily
 794          * makes the holding time of folio lock longer. Second, it forces lock
 795          * ordering of folio lock and transaction start for journaling
 796          * filesystems.
 797          */
 798         if (likely(copied))
 799                 mark_inode_dirty(inode);
 800 out:
 801         /*
 802          * If we didn't copy as much data as expected, we need to trim back
 803          * size of xattr containing inline data.
 804          */
 805         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 806                 ext4_orphan_add(handle, inode);
 807
 808         ret2 = ext4_journal_stop(handle);
 809         if (!ret)
 810                 ret = ret2;
 811         if (pos + len > inode->i_size) {
 812                 ext4_truncate_failed_write(inode);
 813                 /*
 814                  * If truncate failed early the inode might still be
 815                  * on the orphan list; we need to make sure the inode
 816                  * is removed from the orphan list in that case.
 817                  */
 818                 if (inode->i_nlink)
 819                         ext4_orphan_del(NULL, inode);
 820         }
 821         return ret ? ret : copied;
 822 }
 823
 824 /*
 825  * Try to make the page cache and handle ready for the inline data case.
 826  * We can call this function in 2 cases:
 827  * 1. The inode is created and the first write exceeds inline size. We can
 828  *    clear the inode state safely.
 829  * 2. The inode has inline data, then we need to read the data, make it
 830  *    update and dirty so that ext4_da_writepages can handle it. We don't
 831  *    need to start the journal since the file's metadata isn't changed now.
 832  */
 833 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 834                                                  struct inode *inode,
 835                                                  void **fsdata)
 836 {
 837         int ret = 0, inline_size;
 838         struct folio *folio;
 839
 840         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 841                                         mapping_gfp_mask(mapping));
 842         if (IS_ERR(folio))
 843                 return PTR_ERR(folio);
 844
 845         down_read(&EXT4_I(inode)->xattr_sem);
 846         if (!ext4_has_inline_data(inode)) {
 847                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 848                 goto out;
 849         }
 850
 851         inline_size = ext4_get_inline_size(inode);
 852
 853         if (!folio_test_uptodate(folio)) {
 854                 ret = ext4_read_inline_folio(inode, folio);
 855                 if (ret < 0)
 856                         goto out;
 857         }
 858
 859         ret = __block_write_begin(&folio->page, 0, inline_size,
 860                                   ext4_da_get_block_prep);
 861         if (ret) {
 862                 up_read(&EXT4_I(inode)->xattr_sem);
 863                 folio_unlock(folio);
 864                 folio_put(folio);
 865                 ext4_truncate_failed_write(inode);
 866                 return ret;
 867         }
 868
 869         folio_mark_dirty(folio);
 870         folio_mark_uptodate(folio);
 871         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 872         *fsdata = (void *)CONVERT_INLINE_DATA;
 873
 874 out:
 875         up_read(&EXT4_I(inode)->xattr_sem);
 876         if (folio) {
 877                 folio_unlock(folio);
 878                 folio_put(folio);
 879         }
 880         return ret;
 881 }
 882
 883 /*
 884  * Prepare the write for the inline data.
 885  * If the data can be written into the inode, we just read
 886  * the page and make it uptodate, and start the journal.
 887  * Otherwise read the page, makes it dirty so that it can be
 888  * handle in writepages(the i_disksize update is left to the
 889  * normal ext4_da_write_end).
 890  */
 891 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 892                                     struct inode *inode,
 893                                     loff_t pos, unsigned len,
 894                                     struct page **pagep,
 895                                     void **fsdata)
 896 {
 897         int ret;
 898         handle_t *handle;
 899         struct folio *folio;
 900         struct ext4_iloc iloc;
 901         int retries = 0;
 902
 903         ret = ext4_get_inode_loc(inode, &iloc);
 904         if (ret)
 905                 return ret;
 906
 907 retry_journal:
 908         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 909         if (IS_ERR(handle)) {
 910                 ret = PTR_ERR(handle);
 911                 goto out;
 912         }
 913
 914         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 915         if (ret && ret != -ENOSPC)
 916                 goto out_journal;
 917
 918         if (ret == -ENOSPC) {
 919                 ext4_journal_stop(handle);
 920                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 921                                                             inode,
 922                                                             fsdata);
 923                 if (ret == -ENOSPC &&
 924                     ext4_should_retry_alloc(inode->i_sb, &retries))
 925                         goto retry_journal;
 926                 goto out;
 927         }
 928
 929         /*
 930          * We cannot recurse into the filesystem as the transaction
 931          * is already started.
 932          */
 933         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 934                                         mapping_gfp_mask(mapping));
 935         if (IS_ERR(folio)) {
 936                 ret = PTR_ERR(folio);
 937                 goto out_journal;
 938         }
 939
 940         down_read(&EXT4_I(inode)->xattr_sem);
 941         if (!ext4_has_inline_data(inode)) {
 942                 ret = 0;
 943                 goto out_release_page;
 944         }
 945
 946         if (!folio_test_uptodate(folio)) {
 947                 ret = ext4_read_inline_folio(inode, folio);
 948                 if (ret < 0)
 949                         goto out_release_page;
 950         }
 951         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 952                                             EXT4_JTR_NONE);
 953         if (ret)
 954                 goto out_release_page;
 955
 956         up_read(&EXT4_I(inode)->xattr_sem);
 957         *pagep = &folio->page;
 958         brelse(iloc.bh);
 959         return 1;
 960 out_release_page:
 961         up_read(&EXT4_I(inode)->xattr_sem);
 962         folio_unlock(folio);
 963         folio_put(folio);
 964 out_journal:
 965         ext4_journal_stop(handle);
 966 out:
 967         brelse(iloc.bh);
 968         return ret;
 969 }
 970
 971 #ifdef INLINE_DIR_DEBUG
 972 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 973                           void *inline_start, int inline_size)
 974 {
 975         int offset;
 976         unsigned short de_len;
 977         struct ext4_dir_entry_2 *de = inline_start;
 978         void *dlimit = inline_start + inline_size;
 979
 980         trace_printk("inode %lu\n", dir->i_ino);
 981         offset = 0;
 982         while ((void *)de < dlimit) {
 983                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 984                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 985                              offset, de_len, de->name_len, de->name,
 986                              de->name_len, le32_to_cpu(de->inode));
 987                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 988                                          inline_start, inline_size, offset))
 989                         BUG();
 990
 991                 offset += de_len;
 992                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 993         }
 994 }
 995 #else
 996 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 997 #endif
 998
 999 /*
1000  * Add a new entry into a inline dir.
1001  * It will return -ENOSPC if no space is available, and -EIO
1002  * and -EEXIST if directory entry already exists.
1003  */
1004 static int ext4_add_dirent_to_inline(handle_t *handle,
1005                                      struct ext4_filename *fname,
1006                                      struct inode *dir,
1007                                      struct inode *inode,
1008                                      struct ext4_iloc *iloc,
1009                                      void *inline_start, int inline_size)
1010 {
1011         int             err;
1012         struct ext4_dir_entry_2 *de;
1013
1014         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1015                                 inline_size, fname, &de);
1016         if (err)
1017                 return err;
1018
1019         BUFFER_TRACE(iloc->bh, "get_write_access");
1020         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1021                                             EXT4_JTR_NONE);
1022         if (err)
1023                 return err;
1024         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1025
1026         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1027
1028         /*
1029          * XXX shouldn't update any times until successful
1030          * completion of syscall, but too many callers depend
1031          * on this.
1032          *
1033          * XXX similarly, too many callers depend on
1034          * ext4_new_inode() setting the times, but error
1035          * recovery deletes the inode, so the worst that can
1036          * happen is that the times are slightly out of date
1037          * and/or different from the directory change time.
1038          */
1039         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1040         ext4_update_dx_flag(dir);
1041         inode_inc_iversion(dir);
1042         return 1;
1043 }
1044
1045 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1046                                        struct ext4_iloc *iloc)
1047 {
1048         struct ext4_xattr_entry *entry;
1049         struct ext4_xattr_ibody_header *header;
1050
1051         BUG_ON(!EXT4_I(inode)->i_inline_off);
1052
1053         header = IHDR(inode, ext4_raw_inode(iloc));
1054         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1055                                             EXT4_I(inode)->i_inline_off);
1056
1057         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1058 }
1059
1060 /* Set the final de to cover the whole block. */
1061 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1062 {
1063         struct ext4_dir_entry_2 *de, *prev_de;
1064         void *limit;
1065         int de_len;
1066
1067         de = de_buf;
1068         if (old_size) {
1069                 limit = de_buf + old_size;
1070                 do {
1071                         prev_de = de;
1072                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1073                         de_buf += de_len;
1074                         de = de_buf;
1075                 } while (de_buf < limit);
1076
1077                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1078                                                         old_size, new_size);
1079         } else {
1080                 /* this is just created, so create an empty entry. */
1081                 de->inode = 0;
1082                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1083         }
1084 }
1085
1086 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1087                                   struct ext4_iloc *iloc)
1088 {
1089         int ret;
1090         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1091         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1092
1093         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1094                 return -ENOSPC;
1095
1096         ret = ext4_update_inline_data(handle, dir,
1097                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1098         if (ret)
1099                 return ret;
1100
1101         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1102                              EXT4_I(dir)->i_inline_size -
1103                                                 EXT4_MIN_INLINE_DATA_SIZE);
1104         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1105         return 0;
1106 }
1107
1108 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1109                                      struct ext4_iloc *iloc,
1110                                      void *buf, int inline_size)
1111 {
1112         int ret;
1113
1114         ret = ext4_create_inline_data(handle, inode, inline_size);
1115         if (ret) {
1116                 ext4_msg(inode->i_sb, KERN_EMERG,
1117                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1118                         inode->i_ino, ret);
1119                 return;
1120         }
1121         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1122         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1123 }
1124
1125 static int ext4_finish_convert_inline_dir(handle_t *handle,
1126                                           struct inode *inode,
1127                                           struct buffer_head *dir_block,
1128                                           void *buf,
1129                                           int inline_size)
1130 {
1131         int err, csum_size = 0, header_size = 0;
1132         struct ext4_dir_entry_2 *de;
1133         void *target = dir_block->b_data;
1134
1135         /*
1136          * First create "." and ".." and then copy the dir information
1137          * back to the block.
1138          */
1139         de = target;
1140         de = ext4_init_dot_dotdot(inode, de,
1141                 inode->i_sb->s_blocksize, csum_size,
1142                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1143         header_size = (void *)de - target;
1144
1145         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1146                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1147
1148         if (ext4_has_metadata_csum(inode->i_sb))
1149                 csum_size = sizeof(struct ext4_dir_entry_tail);
1150
1151         inode->i_size = inode->i_sb->s_blocksize;
1152         i_size_write(inode, inode->i_sb->s_blocksize);
1153         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1154         ext4_update_final_de(dir_block->b_data,
1155                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1156                         inode->i_sb->s_blocksize - csum_size);
1157
1158         if (csum_size)
1159                 ext4_initialize_dirent_tail(dir_block,
1160                                             inode->i_sb->s_blocksize);
1161         set_buffer_uptodate(dir_block);
1162         unlock_buffer(dir_block);
1163         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1164         if (err)
1165                 return err;
1166         set_buffer_verified(dir_block);
1167         return ext4_mark_inode_dirty(handle, inode);
1168 }
1169
1170 static int ext4_convert_inline_data_nolock(handle_t *handle,
1171                                            struct inode *inode,
1172                                            struct ext4_iloc *iloc)
1173 {
1174         int error;
1175         void *buf = NULL;
1176         struct buffer_head *data_bh = NULL;
1177         struct ext4_map_blocks map;
1178         int inline_size;
1179
1180         inline_size = ext4_get_inline_size(inode);
1181         buf = kmalloc(inline_size, GFP_NOFS);
1182         if (!buf) {
1183                 error = -ENOMEM;
1184                 goto out;
1185         }
1186
1187         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1188         if (error < 0)
1189                 goto out;
1190
1191         /*
1192          * Make sure the inline directory entries pass checks before we try to
1193          * convert them, so that we avoid touching stuff that needs fsck.
1194          */
1195         if (S_ISDIR(inode->i_mode)) {
1196                 error = ext4_check_all_de(inode, iloc->bh,
1197                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1198                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1199                 if (error)
1200                         goto out;
1201         }
1202
1203         error = ext4_destroy_inline_data_nolock(handle, inode);
1204         if (error)
1205                 goto out;
1206
1207         map.m_lblk = 0;
1208         map.m_len = 1;
1209         map.m_flags = 0;
1210         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1211         if (error < 0)
1212                 goto out_restore;
1213         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1214                 error = -EIO;
1215                 goto out_restore;
1216         }
1217
1218         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1219         if (!data_bh) {
1220                 error = -ENOMEM;
1221                 goto out_restore;
1222         }
1223
1224         lock_buffer(data_bh);
1225         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1226                                                EXT4_JTR_NONE);
1227         if (error) {
1228                 unlock_buffer(data_bh);
1229                 error = -EIO;
1230                 goto out_restore;
1231         }
1232         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1233
1234         if (!S_ISDIR(inode->i_mode)) {
1235                 memcpy(data_bh->b_data, buf, inline_size);
1236                 set_buffer_uptodate(data_bh);
1237                 unlock_buffer(data_bh);
1238                 error = ext4_handle_dirty_metadata(handle,
1239                                                    inode, data_bh);
1240         } else {
1241                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1242                                                        buf, inline_size);
1243         }
1244
1245 out_restore:
1246         if (error)
1247                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1248
1249 out:
1250         brelse(data_bh);
1251         kfree(buf);
1252         return error;
1253 }
1254
1255 /*
1256  * Try to add the new entry to the inline data.
1257  * If succeeds, return 0. If not, extended the inline dir and copied data to
1258  * the new created block.
1259  */
1260 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1261                               struct inode *dir, struct inode *inode)
1262 {
1263         int ret, ret2, inline_size, no_expand;
1264         void *inline_start;
1265         struct ext4_iloc iloc;
1266
1267         ret = ext4_get_inode_loc(dir, &iloc);
1268         if (ret)
1269                 return ret;
1270
1271         ext4_write_lock_xattr(dir, &no_expand);
1272         if (!ext4_has_inline_data(dir))
1273                 goto out;
1274
1275         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1276                                                  EXT4_INLINE_DOTDOT_SIZE;
1277         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1278
1279         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1280                                         inline_start, inline_size);
1281         if (ret != -ENOSPC)
1282                 goto out;
1283
1284         /* check whether it can be inserted to inline xattr space. */
1285         inline_size = EXT4_I(dir)->i_inline_size -
1286                         EXT4_MIN_INLINE_DATA_SIZE;
1287         if (!inline_size) {
1288                 /* Try to use the xattr space.*/
1289                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1290                 if (ret && ret != -ENOSPC)
1291                         goto out;
1292
1293                 inline_size = EXT4_I(dir)->i_inline_size -
1294                                 EXT4_MIN_INLINE_DATA_SIZE;
1295         }
1296
1297         if (inline_size) {
1298                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1299
1300                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1301                                                 inode, &iloc, inline_start,
1302                                                 inline_size);
1303
1304                 if (ret != -ENOSPC)
1305                         goto out;
1306         }
1307
1308         /*
1309          * The inline space is filled up, so create a new block for it.
1310          * As the extent tree will be created, we have to save the inline
1311          * dir first.
1312          */
1313         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1314
1315 out:
1316         ext4_write_unlock_xattr(dir, &no_expand);
1317         ret2 = ext4_mark_inode_dirty(handle, dir);
1318         if (unlikely(ret2 && !ret))
1319                 ret = ret2;
1320         brelse(iloc.bh);
1321         return ret;
1322 }
1323
1324 /*
1325  * This function fills a red-black tree with information from an
1326  * inlined dir.  It returns the number directory entries loaded
1327  * into the tree.  If there is an error it is returned in err.
1328  */
1329 int ext4_inlinedir_to_tree(struct file *dir_file,
1330                            struct inode *dir, ext4_lblk_t block,
1331                            struct dx_hash_info *hinfo,
1332                            __u32 start_hash, __u32 start_minor_hash,
1333                            int *has_inline_data)
1334 {
1335         int err = 0, count = 0;
1336         unsigned int parent_ino;
1337         int pos;
1338         struct ext4_dir_entry_2 *de;
1339         struct inode *inode = file_inode(dir_file);
1340         int ret, inline_size = 0;
1341         struct ext4_iloc iloc;
1342         void *dir_buf = NULL;
1343         struct ext4_dir_entry_2 fake;
1344         struct fscrypt_str tmp_str;
1345
1346         ret = ext4_get_inode_loc(inode, &iloc);
1347         if (ret)
1348                 return ret;
1349
1350         down_read(&EXT4_I(inode)->xattr_sem);
1351         if (!ext4_has_inline_data(inode)) {
1352                 up_read(&EXT4_I(inode)->xattr_sem);
1353                 *has_inline_data = 0;
1354                 goto out;
1355         }
1356
1357         inline_size = ext4_get_inline_size(inode);
1358         dir_buf = kmalloc(inline_size, GFP_NOFS);
1359         if (!dir_buf) {
1360                 ret = -ENOMEM;
1361                 up_read(&EXT4_I(inode)->xattr_sem);
1362                 goto out;
1363         }
1364
1365         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1366         up_read(&EXT4_I(inode)->xattr_sem);
1367         if (ret < 0)
1368                 goto out;
1369
1370         pos = 0;
1371         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1372         while (pos < inline_size) {
1373                 /*
1374                  * As inlined dir doesn't store any information about '.' and
1375                  * only the inode number of '..' is stored, we have to handle
1376                  * them differently.
1377                  */
1378                 if (pos == 0) {
1379                         fake.inode = cpu_to_le32(inode->i_ino);
1380                         fake.name_len = 1;
1381                         strcpy(fake.name, ".");
1382                         fake.rec_len = ext4_rec_len_to_disk(
1383                                           ext4_dir_rec_len(fake.name_len, NULL),
1384                                           inline_size);
1385                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1386                         de = &fake;
1387                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1388                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1389                         fake.inode = cpu_to_le32(parent_ino);
1390                         fake.name_len = 2;
1391                         strcpy(fake.name, "..");
1392                         fake.rec_len = ext4_rec_len_to_disk(
1393                                           ext4_dir_rec_len(fake.name_len, NULL),
1394                                           inline_size);
1395                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1396                         de = &fake;
1397                         pos = EXT4_INLINE_DOTDOT_SIZE;
1398                 } else {
1399                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1400                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1401                         if (ext4_check_dir_entry(inode, dir_file, de,
1402                                          iloc.bh, dir_buf,
1403                                          inline_size, pos)) {
1404                                 ret = count;
1405                                 goto out;
1406                         }
1407                 }
1408
1409                 if (ext4_hash_in_dirent(dir)) {
1410                         hinfo->hash = EXT4_DIRENT_HASH(de);
1411                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1412                 } else {
1413                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1414                 }
1415                 if ((hinfo->hash < start_hash) ||
1416                     ((hinfo->hash == start_hash) &&
1417                      (hinfo->minor_hash < start_minor_hash)))
1418                         continue;
1419                 if (de->inode == 0)
1420                         continue;
1421                 tmp_str.name = de->name;
1422                 tmp_str.len = de->name_len;
1423                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1424                                               hinfo->minor_hash, de, &tmp_str);
1425                 if (err) {
1426                         ret = err;
1427                         goto out;
1428                 }
1429                 count++;
1430         }
1431         ret = count;
1432 out:
1433         kfree(dir_buf);
1434         brelse(iloc.bh);
1435         return ret;
1436 }
1437
1438 /*
1439  * So this function is called when the volume is mkfsed with
1440  * dir_index disabled. In order to keep f_pos persistent
1441  * after we convert from an inlined dir to a blocked based,
1442  * we just pretend that we are a normal dir and return the
1443  * offset as if '.' and '..' really take place.
1444  *
1445  */
1446 int ext4_read_inline_dir(struct file *file,
1447                          struct dir_context *ctx,
1448                          int *has_inline_data)
1449 {
1450         unsigned int offset, parent_ino;
1451         int i;
1452         struct ext4_dir_entry_2 *de;
1453         struct super_block *sb;
1454         struct inode *inode = file_inode(file);
1455         int ret, inline_size = 0;
1456         struct ext4_iloc iloc;
1457         void *dir_buf = NULL;
1458         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1459
1460         ret = ext4_get_inode_loc(inode, &iloc);
1461         if (ret)
1462                 return ret;
1463
1464         down_read(&EXT4_I(inode)->xattr_sem);
1465         if (!ext4_has_inline_data(inode)) {
1466                 up_read(&EXT4_I(inode)->xattr_sem);
1467                 *has_inline_data = 0;
1468                 goto out;
1469         }
1470
1471         inline_size = ext4_get_inline_size(inode);
1472         dir_buf = kmalloc(inline_size, GFP_NOFS);
1473         if (!dir_buf) {
1474                 ret = -ENOMEM;
1475                 up_read(&EXT4_I(inode)->xattr_sem);
1476                 goto out;
1477         }
1478
1479         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1480         up_read(&EXT4_I(inode)->xattr_sem);
1481         if (ret < 0)
1482                 goto out;
1483
1484         ret = 0;
1485         sb = inode->i_sb;
1486         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1487         offset = ctx->pos;
1488
1489         /*
1490          * dotdot_offset and dotdot_size is the real offset and
1491          * size for ".." and "." if the dir is block based while
1492          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1493          * So we will use extra_offset and extra_size to indicate them
1494          * during the inline dir iteration.
1495          */
1496         dotdot_offset = ext4_dir_rec_len(1, NULL);
1497         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1498         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1499         extra_size = extra_offset + inline_size;
1500
1501         /*
1502          * If the version has changed since the last call to
1503          * readdir(2), then we might be pointing to an invalid
1504          * dirent right now.  Scan from the start of the inline
1505          * dir to make sure.
1506          */
1507         if (!inode_eq_iversion(inode, file->f_version)) {
1508                 for (i = 0; i < extra_size && i < offset;) {
1509                         /*
1510                          * "." is with offset 0 and
1511                          * ".." is dotdot_offset.
1512                          */
1513                         if (!i) {
1514                                 i = dotdot_offset;
1515                                 continue;
1516                         } else if (i == dotdot_offset) {
1517                                 i = dotdot_size;
1518                                 continue;
1519                         }
1520                         /* for other entry, the real offset in
1521                          * the buf has to be tuned accordingly.
1522                          */
1523                         de = (struct ext4_dir_entry_2 *)
1524                                 (dir_buf + i - extra_offset);
1525                         /* It's too expensive to do a full
1526                          * dirent test each time round this
1527                          * loop, but we do have to test at
1528                          * least that it is non-zero.  A
1529                          * failure will be detected in the
1530                          * dirent test below. */
1531                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1532                                 < ext4_dir_rec_len(1, NULL))
1533                                 break;
1534                         i += ext4_rec_len_from_disk(de->rec_len,
1535                                                     extra_size);
1536                 }
1537                 offset = i;
1538                 ctx->pos = offset;
1539                 file->f_version = inode_query_iversion(inode);
1540         }
1541
1542         while (ctx->pos < extra_size) {
1543                 if (ctx->pos == 0) {
1544                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1545                                 goto out;
1546                         ctx->pos = dotdot_offset;
1547                         continue;
1548                 }
1549
1550                 if (ctx->pos == dotdot_offset) {
1551                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1552                                 goto out;
1553                         ctx->pos = dotdot_size;
1554                         continue;
1555                 }
1556
1557                 de = (struct ext4_dir_entry_2 *)
1558                         (dir_buf + ctx->pos - extra_offset);
1559                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1560                                          extra_size, ctx->pos))
1561                         goto out;
1562                 if (le32_to_cpu(de->inode)) {
1563                         if (!dir_emit(ctx, de->name, de->name_len,
1564                                       le32_to_cpu(de->inode),
1565                                       get_dtype(sb, de->file_type)))
1566                                 goto out;
1567                 }
1568                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1569         }
1570 out:
1571         kfree(dir_buf);
1572         brelse(iloc.bh);
1573         return ret;
1574 }
1575
1576 void *ext4_read_inline_link(struct inode *inode)
1577 {
1578         struct ext4_iloc iloc;
1579         int ret, inline_size;
1580         void *link;
1581
1582         ret = ext4_get_inode_loc(inode, &iloc);
1583         if (ret)
1584                 return ERR_PTR(ret);
1585
1586         ret = -ENOMEM;
1587         inline_size = ext4_get_inline_size(inode);
1588         link = kmalloc(inline_size + 1, GFP_NOFS);
1589         if (!link)
1590                 goto out;
1591
1592         ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1593         if (ret < 0) {
1594                 kfree(link);
1595                 goto out;
1596         }
1597         nd_terminate_link(link, inode->i_size, ret);
1598 out:
1599         if (ret < 0)
1600                 link = ERR_PTR(ret);
1601         brelse(iloc.bh);
1602         return link;
1603 }
1604
1605 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1606                                         struct ext4_dir_entry_2 **parent_de,
1607                                         int *retval)
1608 {
1609         struct ext4_iloc iloc;
1610
1611         *retval = ext4_get_inode_loc(inode, &iloc);
1612         if (*retval)
1613                 return NULL;
1614
1615         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1616
1617         return iloc.bh;
1618 }
1619
1620 /*
1621  * Try to create the inline data for the new dir.
1622  * If it succeeds, return 0, otherwise return the error.
1623  * In case of ENOSPC, the caller should create the normal disk layout dir.
1624  */
1625 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1626                                struct inode *inode)
1627 {
1628         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1629         struct ext4_iloc iloc;
1630         struct ext4_dir_entry_2 *de;
1631
1632         ret = ext4_get_inode_loc(inode, &iloc);
1633         if (ret)
1634                 return ret;
1635
1636         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1637         if (ret)
1638                 goto out;
1639
1640         /*
1641          * For inline dir, we only save the inode information for the ".."
1642          * and create a fake dentry to cover the left space.
1643          */
1644         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1645         de->inode = cpu_to_le32(parent->i_ino);
1646         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1647         de->inode = 0;
1648         de->rec_len = ext4_rec_len_to_disk(
1649                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1650                                 inline_size);
1651         set_nlink(inode, 2);
1652         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1653 out:
1654         brelse(iloc.bh);
1655         return ret;
1656 }
1657
1658 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1659                                         struct ext4_filename *fname,
1660                                         struct ext4_dir_entry_2 **res_dir,
1661                                         int *has_inline_data)
1662 {
1663         int ret;
1664         struct ext4_iloc iloc;
1665         void *inline_start;
1666         int inline_size;
1667
1668         if (ext4_get_inode_loc(dir, &iloc))
1669                 return NULL;
1670
1671         down_read(&EXT4_I(dir)->xattr_sem);
1672         if (!ext4_has_inline_data(dir)) {
1673                 *has_inline_data = 0;
1674                 goto out;
1675         }
1676
1677         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1678                                                 EXT4_INLINE_DOTDOT_SIZE;
1679         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1680         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1681                               dir, fname, 0, res_dir);
1682         if (ret == 1)
1683                 goto out_find;
1684         if (ret < 0)
1685                 goto out;
1686
1687         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1688                 goto out;
1689
1690         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1691         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1692
1693         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1694                               dir, fname, 0, res_dir);
1695         if (ret == 1)
1696                 goto out_find;
1697
1698 out:
1699         brelse(iloc.bh);
1700         iloc.bh = NULL;
1701 out_find:
1702         up_read(&EXT4_I(dir)->xattr_sem);
1703         return iloc.bh;
1704 }
1705
1706 int ext4_delete_inline_entry(handle_t *handle,
1707                              struct inode *dir,
1708                              struct ext4_dir_entry_2 *de_del,
1709                              struct buffer_head *bh,
1710                              int *has_inline_data)
1711 {
1712         int err, inline_size, no_expand;
1713         struct ext4_iloc iloc;
1714         void *inline_start;
1715
1716         err = ext4_get_inode_loc(dir, &iloc);
1717         if (err)
1718                 return err;
1719
1720         ext4_write_lock_xattr(dir, &no_expand);
1721         if (!ext4_has_inline_data(dir)) {
1722                 *has_inline_data = 0;
1723                 goto out;
1724         }
1725
1726         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1727                 EXT4_MIN_INLINE_DATA_SIZE) {
1728                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1729                                         EXT4_INLINE_DOTDOT_SIZE;
1730                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1731                                 EXT4_INLINE_DOTDOT_SIZE;
1732         } else {
1733                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1734                 inline_size = ext4_get_inline_size(dir) -
1735                                 EXT4_MIN_INLINE_DATA_SIZE;
1736         }
1737
1738         BUFFER_TRACE(bh, "get_write_access");
1739         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1740                                             EXT4_JTR_NONE);
1741         if (err)
1742                 goto out;
1743
1744         err = ext4_generic_delete_entry(dir, de_del, bh,
1745                                         inline_start, inline_size, 0);
1746         if (err)
1747                 goto out;
1748
1749         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1750 out:
1751         ext4_write_unlock_xattr(dir, &no_expand);
1752         if (likely(err == 0))
1753                 err = ext4_mark_inode_dirty(handle, dir);
1754         brelse(iloc.bh);
1755         if (err != -ENOENT)
1756                 ext4_std_error(dir->i_sb, err);
1757         return err;
1758 }
1759
1760 /*
1761  * Get the inline dentry at offset.
1762  */
1763 static inline struct ext4_dir_entry_2 *
1764 ext4_get_inline_entry(struct inode *inode,
1765                       struct ext4_iloc *iloc,
1766                       unsigned int offset,
1767                       void **inline_start,
1768                       int *inline_size)
1769 {
1770         void *inline_pos;
1771
1772         BUG_ON(offset > ext4_get_inline_size(inode));
1773
1774         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1775                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1776                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1777         } else {
1778                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1779                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1780                 *inline_size = ext4_get_inline_size(inode) -
1781                                 EXT4_MIN_INLINE_DATA_SIZE;
1782         }
1783
1784         if (inline_start)
1785                 *inline_start = inline_pos;
1786         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1787 }
1788
1789 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1790 {
1791         int err, inline_size;
1792         struct ext4_iloc iloc;
1793         size_t inline_len;
1794         void *inline_pos;
1795         unsigned int offset;
1796         struct ext4_dir_entry_2 *de;
1797         bool ret = false;
1798
1799         err = ext4_get_inode_loc(dir, &iloc);
1800         if (err) {
1801                 EXT4_ERROR_INODE_ERR(dir, -err,
1802                                      "error %d getting inode %lu block",
1803                                      err, dir->i_ino);
1804                 return false;
1805         }
1806
1807         down_read(&EXT4_I(dir)->xattr_sem);
1808         if (!ext4_has_inline_data(dir)) {
1809                 *has_inline_data = 0;
1810                 ret = true;
1811                 goto out;
1812         }
1813
1814         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1815         if (!le32_to_cpu(de->inode)) {
1816                 ext4_warning(dir->i_sb,
1817                              "bad inline directory (dir #%lu) - no `..'",
1818                              dir->i_ino);
1819                 goto out;
1820         }
1821
1822         inline_len = ext4_get_inline_size(dir);
1823         offset = EXT4_INLINE_DOTDOT_SIZE;
1824         while (offset < inline_len) {
1825                 de = ext4_get_inline_entry(dir, &iloc, offset,
1826                                            &inline_pos, &inline_size);
1827                 if (ext4_check_dir_entry(dir, NULL, de,
1828                                          iloc.bh, inline_pos,
1829                                          inline_size, offset)) {
1830                         ext4_warning(dir->i_sb,
1831                                      "bad inline directory (dir #%lu) - "
1832                                      "inode %u, rec_len %u, name_len %d"
1833                                      "inline size %d",
1834                                      dir->i_ino, le32_to_cpu(de->inode),
1835                                      le16_to_cpu(de->rec_len), de->name_len,
1836                                      inline_size);
1837                         goto out;
1838                 }
1839                 if (le32_to_cpu(de->inode)) {
1840                         goto out;
1841                 }
1842                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1843         }
1844
1845         ret = true;
1846 out:
1847         up_read(&EXT4_I(dir)->xattr_sem);
1848         brelse(iloc.bh);
1849         return ret;
1850 }
1851
1852 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1853 {
1854         int ret, no_expand;
1855
1856         ext4_write_lock_xattr(inode, &no_expand);
1857         ret = ext4_destroy_inline_data_nolock(handle, inode);
1858         ext4_write_unlock_xattr(inode, &no_expand);
1859
1860         return ret;
1861 }
1862
1863 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1864 {
1865         __u64 addr;
1866         int error = -EAGAIN;
1867         struct ext4_iloc iloc;
1868
1869         down_read(&EXT4_I(inode)->xattr_sem);
1870         if (!ext4_has_inline_data(inode))
1871                 goto out;
1872
1873         error = ext4_get_inode_loc(inode, &iloc);
1874         if (error)
1875                 goto out;
1876
1877         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1878         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1879         addr += offsetof(struct ext4_inode, i_block);
1880
1881         brelse(iloc.bh);
1882
1883         iomap->addr = addr;
1884         iomap->offset = 0;
1885         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1886                               i_size_read(inode));
1887         iomap->type = IOMAP_INLINE;
1888         iomap->flags = 0;
1889
1890 out:
1891         up_read(&EXT4_I(inode)->xattr_sem);
1892         return error;
1893 }
1894
1895 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1896 {
1897         handle_t *handle;
1898         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1899         size_t i_size;
1900         void *value = NULL;
1901         struct ext4_xattr_ibody_find is = {
1902                 .s = { .not_found = -ENODATA, },
1903         };
1904         struct ext4_xattr_info i = {
1905                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1906                 .name = EXT4_XATTR_SYSTEM_DATA,
1907         };
1908
1909
1910         needed_blocks = ext4_writepage_trans_blocks(inode);
1911         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1912         if (IS_ERR(handle))
1913                 return PTR_ERR(handle);
1914
1915         ext4_write_lock_xattr(inode, &no_expand);
1916         if (!ext4_has_inline_data(inode)) {
1917                 ext4_write_unlock_xattr(inode, &no_expand);
1918                 *has_inline = 0;
1919                 ext4_journal_stop(handle);
1920                 return 0;
1921         }
1922
1923         if ((err = ext4_orphan_add(handle, inode)) != 0)
1924                 goto out;
1925
1926         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1927                 goto out;
1928
1929         down_write(&EXT4_I(inode)->i_data_sem);
1930         i_size = inode->i_size;
1931         inline_size = ext4_get_inline_size(inode);
1932         EXT4_I(inode)->i_disksize = i_size;
1933
1934         if (i_size < inline_size) {
1935                 /*
1936                  * if there's inline data to truncate and this file was
1937                  * converted to extents after that inline data was written,
1938                  * the extent status cache must be cleared to avoid leaving
1939                  * behind stale delayed allocated extent entries
1940                  */
1941                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1942                         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1943
1944                 /* Clear the content in the xattr space. */
1945                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1946                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1947                                 goto out_error;
1948
1949                         BUG_ON(is.s.not_found);
1950
1951                         value_len = le32_to_cpu(is.s.here->e_value_size);
1952                         value = kmalloc(value_len, GFP_NOFS);
1953                         if (!value) {
1954                                 err = -ENOMEM;
1955                                 goto out_error;
1956                         }
1957
1958                         err = ext4_xattr_ibody_get(inode, i.name_index,
1959                                                    i.name, value, value_len);
1960                         if (err <= 0)
1961                                 goto out_error;
1962
1963                         i.value = value;
1964                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1965                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1966                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1967                         if (err)
1968                                 goto out_error;
1969                 }
1970
1971                 /* Clear the content within i_blocks. */
1972                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1973                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1974                         memset(p + i_size, 0,
1975                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1976                 }
1977
1978                 EXT4_I(inode)->i_inline_size = i_size <
1979                                         EXT4_MIN_INLINE_DATA_SIZE ?
1980                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1981         }
1982
1983 out_error:
1984         up_write(&EXT4_I(inode)->i_data_sem);
1985 out:
1986         brelse(is.iloc.bh);
1987         ext4_write_unlock_xattr(inode, &no_expand);
1988         kfree(value);
1989         if (inode->i_nlink)
1990                 ext4_orphan_del(handle, inode);
1991
1992         if (err == 0) {
1993                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1994                 err = ext4_mark_inode_dirty(handle, inode);
1995                 if (IS_SYNC(inode))
1996                         ext4_handle_sync(handle);
1997         }
1998         ext4_journal_stop(handle);
1999         return err;
2000 }
2001
2002 int ext4_convert_inline_data(struct inode *inode)
2003 {
2004         int error, needed_blocks, no_expand;
2005         handle_t *handle;
2006         struct ext4_iloc iloc;
2007
2008         if (!ext4_has_inline_data(inode)) {
2009                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2010                 return 0;
2011         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2012                 /*
2013                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2014                  * cleared. This means we are in the middle of moving of
2015                  * inline data to delay allocated block. Just force writeout
2016                  * here to finish conversion.
2017                  */
2018                 error = filemap_flush(inode->i_mapping);
2019                 if (error)
2020                         return error;
2021                 if (!ext4_has_inline_data(inode))
2022                         return 0;
2023         }
2024
2025         needed_blocks = ext4_writepage_trans_blocks(inode);
2026
2027         iloc.bh = NULL;
2028         error = ext4_get_inode_loc(inode, &iloc);
2029         if (error)
2030                 return error;
2031
2032         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2033         if (IS_ERR(handle)) {
2034                 error = PTR_ERR(handle);
2035                 goto out_free;
2036         }
2037
2038         ext4_write_lock_xattr(inode, &no_expand);
2039         if (ext4_has_inline_data(inode))
2040                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2041         ext4_write_unlock_xattr(inode, &no_expand);
2042         ext4_journal_stop(handle);
2043 out_free:
2044         brelse(iloc.bh);
2045         return error;
2046 }