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         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         flush_dcache_folio(folio);
 506         kunmap_local(kaddr);
 507         folio_zero_segment(folio, len, folio_size(folio));
 508         folio_mark_uptodate(folio);
 509         brelse(iloc.bh);
 510
 511 out:
 512         return ret;
 513 }
 514
 515 int ext4_readpage_inline(struct inode *inode, struct folio *folio)
 516 {
 517         int ret = 0;
 518
 519         down_read(&EXT4_I(inode)->xattr_sem);
 520         if (!ext4_has_inline_data(inode)) {
 521                 up_read(&EXT4_I(inode)->xattr_sem);
 522                 return -EAGAIN;
 523         }
 524
 525         /*
 526          * Current inline data can only exist in the 1st page,
 527          * So for all the other pages, just set them uptodate.
 528          */
 529         if (!folio->index)
 530                 ret = ext4_read_inline_folio(inode, folio);
 531         else if (!folio_test_uptodate(folio)) {
 532                 folio_zero_segment(folio, 0, folio_size(folio));
 533                 folio_mark_uptodate(folio);
 534         }
 535
 536         up_read(&EXT4_I(inode)->xattr_sem);
 537
 538         folio_unlock(folio);
 539         return ret >= 0 ? 0 : ret;
 540 }
 541
 542 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 543                                               struct inode *inode)
 544 {
 545         int ret, needed_blocks, no_expand;
 546         handle_t *handle = NULL;
 547         int retries = 0, sem_held = 0;
 548         struct folio *folio = NULL;
 549         unsigned from, to;
 550         struct ext4_iloc iloc;
 551
 552         if (!ext4_has_inline_data(inode)) {
 553                 /*
 554                  * clear the flag so that no new write
 555                  * will trap here again.
 556                  */
 557                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 558                 return 0;
 559         }
 560
 561         needed_blocks = ext4_writepage_trans_blocks(inode);
 562
 563         ret = ext4_get_inode_loc(inode, &iloc);
 564         if (ret)
 565                 return ret;
 566
 567 retry:
 568         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 569         if (IS_ERR(handle)) {
 570                 ret = PTR_ERR(handle);
 571                 handle = NULL;
 572                 goto out;
 573         }
 574
 575         /* We cannot recurse into the filesystem as the transaction is already
 576          * started */
 577         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 578                         mapping_gfp_mask(mapping));
 579         if (IS_ERR(folio)) {
 580                 ret = PTR_ERR(folio);
 581                 goto out_nofolio;
 582         }
 583
 584         ext4_write_lock_xattr(inode, &no_expand);
 585         sem_held = 1;
 586         /* If some one has already done this for us, just exit. */
 587         if (!ext4_has_inline_data(inode)) {
 588                 ret = 0;
 589                 goto out;
 590         }
 591
 592         from = 0;
 593         to = ext4_get_inline_size(inode);
 594         if (!folio_test_uptodate(folio)) {
 595                 ret = ext4_read_inline_folio(inode, folio);
 596                 if (ret < 0)
 597                         goto out;
 598         }
 599
 600         ret = ext4_destroy_inline_data_nolock(handle, inode);
 601         if (ret)
 602                 goto out;
 603
 604         if (ext4_should_dioread_nolock(inode)) {
 605                 ret = __block_write_begin(&folio->page, from, to,
 606                                           ext4_get_block_unwritten);
 607         } else
 608                 ret = __block_write_begin(&folio->page, from, to, ext4_get_block);
 609
 610         if (!ret && ext4_should_journal_data(inode)) {
 611                 ret = ext4_walk_page_buffers(handle, inode,
 612                                              folio_buffers(folio), from, to,
 613                                              NULL, do_journal_get_write_access);
 614         }
 615
 616         if (ret) {
 617                 folio_unlock(folio);
 618                 folio_put(folio);
 619                 folio = NULL;
 620                 ext4_orphan_add(handle, inode);
 621                 ext4_write_unlock_xattr(inode, &no_expand);
 622                 sem_held = 0;
 623                 ext4_journal_stop(handle);
 624                 handle = NULL;
 625                 ext4_truncate_failed_write(inode);
 626                 /*
 627                  * If truncate failed early the inode might
 628                  * still be on the orphan list; we need to
 629                  * make sure the inode is removed from the
 630                  * orphan list in that case.
 631                  */
 632                 if (inode->i_nlink)
 633                         ext4_orphan_del(NULL, inode);
 634         }
 635
 636         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 637                 goto retry;
 638
 639         if (folio)
 640                 block_commit_write(&folio->page, from, to);
 641 out:
 642         if (folio) {
 643                 folio_unlock(folio);
 644                 folio_put(folio);
 645         }
 646 out_nofolio:
 647         if (sem_held)
 648                 ext4_write_unlock_xattr(inode, &no_expand);
 649         if (handle)
 650                 ext4_journal_stop(handle);
 651         brelse(iloc.bh);
 652         return ret;
 653 }
 654
 655 /*
 656  * Try to write data in the inode.
 657  * If the inode has inline data, check whether the new write can be
 658  * in the inode also. If not, create the page the handle, move the data
 659  * to the page make it update and let the later codes create extent for it.
 660  */
 661 int ext4_try_to_write_inline_data(struct address_space *mapping,
 662                                   struct inode *inode,
 663                                   loff_t pos, unsigned len,
 664                                   struct page **pagep)
 665 {
 666         int ret;
 667         handle_t *handle;
 668         struct folio *folio;
 669         struct ext4_iloc iloc;
 670
 671         if (pos + len > ext4_get_max_inline_size(inode))
 672                 goto convert;
 673
 674         ret = ext4_get_inode_loc(inode, &iloc);
 675         if (ret)
 676                 return ret;
 677
 678         /*
 679          * The possible write could happen in the inode,
 680          * so try to reserve the space in inode first.
 681          */
 682         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 683         if (IS_ERR(handle)) {
 684                 ret = PTR_ERR(handle);
 685                 handle = NULL;
 686                 goto out;
 687         }
 688
 689         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 690         if (ret && ret != -ENOSPC)
 691                 goto out;
 692
 693         /* We don't have space in inline inode, so convert it to extent. */
 694         if (ret == -ENOSPC) {
 695                 ext4_journal_stop(handle);
 696                 brelse(iloc.bh);
 697                 goto convert;
 698         }
 699
 700         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 701                                             EXT4_JTR_NONE);
 702         if (ret)
 703                 goto out;
 704
 705         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 706                                         mapping_gfp_mask(mapping));
 707         if (IS_ERR(folio)) {
 708                 ret = PTR_ERR(folio);
 709                 goto out;
 710         }
 711
 712         *pagep = &folio->page;
 713         down_read(&EXT4_I(inode)->xattr_sem);
 714         if (!ext4_has_inline_data(inode)) {
 715                 ret = 0;
 716                 folio_unlock(folio);
 717                 folio_put(folio);
 718                 goto out_up_read;
 719         }
 720
 721         if (!folio_test_uptodate(folio)) {
 722                 ret = ext4_read_inline_folio(inode, folio);
 723                 if (ret < 0) {
 724                         folio_unlock(folio);
 725                         folio_put(folio);
 726                         goto out_up_read;
 727                 }
 728         }
 729
 730         ret = 1;
 731         handle = NULL;
 732 out_up_read:
 733         up_read(&EXT4_I(inode)->xattr_sem);
 734 out:
 735         if (handle && (ret != 1))
 736                 ext4_journal_stop(handle);
 737         brelse(iloc.bh);
 738         return ret;
 739 convert:
 740         return ext4_convert_inline_data_to_extent(mapping, inode);
 741 }
 742
 743 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 744                                unsigned copied, struct folio *folio)
 745 {
 746         handle_t *handle = ext4_journal_current_handle();
 747         int no_expand;
 748         void *kaddr;
 749         struct ext4_iloc iloc;
 750         int ret = 0, ret2;
 751
 752         if (unlikely(copied < len) && !folio_test_uptodate(folio))
 753                 copied = 0;
 754
 755         if (likely(copied)) {
 756                 ret = ext4_get_inode_loc(inode, &iloc);
 757                 if (ret) {
 758                         folio_unlock(folio);
 759                         folio_put(folio);
 760                         ext4_std_error(inode->i_sb, ret);
 761                         goto out;
 762                 }
 763                 ext4_write_lock_xattr(inode, &no_expand);
 764                 BUG_ON(!ext4_has_inline_data(inode));
 765
 766                 /*
 767                  * ei->i_inline_off may have changed since
 768                  * ext4_write_begin() called
 769                  * ext4_try_to_write_inline_data()
 770                  */
 771                 (void) ext4_find_inline_data_nolock(inode);
 772
 773                 kaddr = kmap_local_folio(folio, 0);
 774                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 775                 kunmap_local(kaddr);
 776                 folio_mark_uptodate(folio);
 777                 /* clear dirty flag so that writepages wouldn't work for us. */
 778                 folio_clear_dirty(folio);
 779
 780                 ext4_write_unlock_xattr(inode, &no_expand);
 781                 brelse(iloc.bh);
 782
 783                 /*
 784                  * It's important to update i_size while still holding folio
 785                  * lock: page writeout could otherwise come in and zero
 786                  * beyond i_size.
 787                  */
 788                 ext4_update_inode_size(inode, pos + copied);
 789         }
 790         folio_unlock(folio);
 791         folio_put(folio);
 792
 793         /*
 794          * Don't mark the inode dirty under folio lock. First, it unnecessarily
 795          * makes the holding time of folio lock longer. Second, it forces lock
 796          * ordering of folio lock and transaction start for journaling
 797          * filesystems.
 798          */
 799         if (likely(copied))
 800                 mark_inode_dirty(inode);
 801 out:
 802         /*
 803          * If we didn't copy as much data as expected, we need to trim back
 804          * size of xattr containing inline data.
 805          */
 806         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 807                 ext4_orphan_add(handle, inode);
 808
 809         ret2 = ext4_journal_stop(handle);
 810         if (!ret)
 811                 ret = ret2;
 812         if (pos + len > inode->i_size) {
 813                 ext4_truncate_failed_write(inode);
 814                 /*
 815                  * If truncate failed early the inode might still be
 816                  * on the orphan list; we need to make sure the inode
 817                  * is removed from the orphan list in that case.
 818                  */
 819                 if (inode->i_nlink)
 820                         ext4_orphan_del(NULL, inode);
 821         }
 822         return ret ? ret : copied;
 823 }
 824
 825 /*
 826  * Try to make the page cache and handle ready for the inline data case.
 827  * We can call this function in 2 cases:
 828  * 1. The inode is created and the first write exceeds inline size. We can
 829  *    clear the inode state safely.
 830  * 2. The inode has inline data, then we need to read the data, make it
 831  *    update and dirty so that ext4_da_writepages can handle it. We don't
 832  *    need to start the journal since the file's metadata isn't changed now.
 833  */
 834 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 835                                                  struct inode *inode,
 836                                                  void **fsdata)
 837 {
 838         int ret = 0, inline_size;
 839         struct folio *folio;
 840
 841         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 842                                         mapping_gfp_mask(mapping));
 843         if (IS_ERR(folio))
 844                 return PTR_ERR(folio);
 845
 846         down_read(&EXT4_I(inode)->xattr_sem);
 847         if (!ext4_has_inline_data(inode)) {
 848                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 849                 goto out;
 850         }
 851
 852         inline_size = ext4_get_inline_size(inode);
 853
 854         if (!folio_test_uptodate(folio)) {
 855                 ret = ext4_read_inline_folio(inode, folio);
 856                 if (ret < 0)
 857                         goto out;
 858         }
 859
 860         ret = __block_write_begin(&folio->page, 0, inline_size,
 861                                   ext4_da_get_block_prep);
 862         if (ret) {
 863                 up_read(&EXT4_I(inode)->xattr_sem);
 864                 folio_unlock(folio);
 865                 folio_put(folio);
 866                 ext4_truncate_failed_write(inode);
 867                 return ret;
 868         }
 869
 870         folio_mark_dirty(folio);
 871         folio_mark_uptodate(folio);
 872         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 873         *fsdata = (void *)CONVERT_INLINE_DATA;
 874
 875 out:
 876         up_read(&EXT4_I(inode)->xattr_sem);
 877         if (folio) {
 878                 folio_unlock(folio);
 879                 folio_put(folio);
 880         }
 881         return ret;
 882 }
 883
 884 /*
 885  * Prepare the write for the inline data.
 886  * If the data can be written into the inode, we just read
 887  * the page and make it uptodate, and start the journal.
 888  * Otherwise read the page, makes it dirty so that it can be
 889  * handle in writepages(the i_disksize update is left to the
 890  * normal ext4_da_write_end).
 891  */
 892 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 893                                     struct inode *inode,
 894                                     loff_t pos, unsigned len,
 895                                     struct page **pagep,
 896                                     void **fsdata)
 897 {
 898         int ret;
 899         handle_t *handle;
 900         struct folio *folio;
 901         struct ext4_iloc iloc;
 902         int retries = 0;
 903
 904         ret = ext4_get_inode_loc(inode, &iloc);
 905         if (ret)
 906                 return ret;
 907
 908 retry_journal:
 909         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 910         if (IS_ERR(handle)) {
 911                 ret = PTR_ERR(handle);
 912                 goto out;
 913         }
 914
 915         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 916         if (ret && ret != -ENOSPC)
 917                 goto out_journal;
 918
 919         if (ret == -ENOSPC) {
 920                 ext4_journal_stop(handle);
 921                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 922                                                             inode,
 923                                                             fsdata);
 924                 if (ret == -ENOSPC &&
 925                     ext4_should_retry_alloc(inode->i_sb, &retries))
 926                         goto retry_journal;
 927                 goto out;
 928         }
 929
 930         /*
 931          * We cannot recurse into the filesystem as the transaction
 932          * is already started.
 933          */
 934         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 935                                         mapping_gfp_mask(mapping));
 936         if (IS_ERR(folio)) {
 937                 ret = PTR_ERR(folio);
 938                 goto out_journal;
 939         }
 940
 941         down_read(&EXT4_I(inode)->xattr_sem);
 942         if (!ext4_has_inline_data(inode)) {
 943                 ret = 0;
 944                 goto out_release_page;
 945         }
 946
 947         if (!folio_test_uptodate(folio)) {
 948                 ret = ext4_read_inline_folio(inode, folio);
 949                 if (ret < 0)
 950                         goto out_release_page;
 951         }
 952         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 953                                             EXT4_JTR_NONE);
 954         if (ret)
 955                 goto out_release_page;
 956
 957         up_read(&EXT4_I(inode)->xattr_sem);
 958         *pagep = &folio->page;
 959         brelse(iloc.bh);
 960         return 1;
 961 out_release_page:
 962         up_read(&EXT4_I(inode)->xattr_sem);
 963         folio_unlock(folio);
 964         folio_put(folio);
 965 out_journal:
 966         ext4_journal_stop(handle);
 967 out:
 968         brelse(iloc.bh);
 969         return ret;
 970 }
 971
 972 #ifdef INLINE_DIR_DEBUG
 973 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 974                           void *inline_start, int inline_size)
 975 {
 976         int offset;
 977         unsigned short de_len;
 978         struct ext4_dir_entry_2 *de = inline_start;
 979         void *dlimit = inline_start + inline_size;
 980
 981         trace_printk("inode %lu\n", dir->i_ino);
 982         offset = 0;
 983         while ((void *)de < dlimit) {
 984                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 985                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 986                              offset, de_len, de->name_len, de->name,
 987                              de->name_len, le32_to_cpu(de->inode));
 988                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 989                                          inline_start, inline_size, offset))
 990                         BUG();
 991
 992                 offset += de_len;
 993                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 994         }
 995 }
 996 #else
 997 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 998 #endif
 999
1000 /*
1001  * Add a new entry into a inline dir.
1002  * It will return -ENOSPC if no space is available, and -EIO
1003  * and -EEXIST if directory entry already exists.
1004  */
1005 static int ext4_add_dirent_to_inline(handle_t *handle,
1006                                      struct ext4_filename *fname,
1007                                      struct inode *dir,
1008                                      struct inode *inode,
1009                                      struct ext4_iloc *iloc,
1010                                      void *inline_start, int inline_size)
1011 {
1012         int             err;
1013         struct ext4_dir_entry_2 *de;
1014
1015         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1016                                 inline_size, fname, &de);
1017         if (err)
1018                 return err;
1019
1020         BUFFER_TRACE(iloc->bh, "get_write_access");
1021         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1022                                             EXT4_JTR_NONE);
1023         if (err)
1024                 return err;
1025         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1026
1027         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1028
1029         /*
1030          * XXX shouldn't update any times until successful
1031          * completion of syscall, but too many callers depend
1032          * on this.
1033          *
1034          * XXX similarly, too many callers depend on
1035          * ext4_new_inode() setting the times, but error
1036          * recovery deletes the inode, so the worst that can
1037          * happen is that the times are slightly out of date
1038          * and/or different from the directory change time.
1039          */
1040         dir->i_mtime = inode_set_ctime_current(dir);
1041         ext4_update_dx_flag(dir);
1042         inode_inc_iversion(dir);
1043         return 1;
1044 }
1045
1046 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1047                                        struct ext4_iloc *iloc)
1048 {
1049         struct ext4_xattr_entry *entry;
1050         struct ext4_xattr_ibody_header *header;
1051
1052         BUG_ON(!EXT4_I(inode)->i_inline_off);
1053
1054         header = IHDR(inode, ext4_raw_inode(iloc));
1055         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1056                                             EXT4_I(inode)->i_inline_off);
1057
1058         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1059 }
1060
1061 /* Set the final de to cover the whole block. */
1062 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1063 {
1064         struct ext4_dir_entry_2 *de, *prev_de;
1065         void *limit;
1066         int de_len;
1067
1068         de = de_buf;
1069         if (old_size) {
1070                 limit = de_buf + old_size;
1071                 do {
1072                         prev_de = de;
1073                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1074                         de_buf += de_len;
1075                         de = de_buf;
1076                 } while (de_buf < limit);
1077
1078                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1079                                                         old_size, new_size);
1080         } else {
1081                 /* this is just created, so create an empty entry. */
1082                 de->inode = 0;
1083                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1084         }
1085 }
1086
1087 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1088                                   struct ext4_iloc *iloc)
1089 {
1090         int ret;
1091         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1092         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1093
1094         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1095                 return -ENOSPC;
1096
1097         ret = ext4_update_inline_data(handle, dir,
1098                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1099         if (ret)
1100                 return ret;
1101
1102         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1103                              EXT4_I(dir)->i_inline_size -
1104                                                 EXT4_MIN_INLINE_DATA_SIZE);
1105         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1106         return 0;
1107 }
1108
1109 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1110                                      struct ext4_iloc *iloc,
1111                                      void *buf, int inline_size)
1112 {
1113         int ret;
1114
1115         ret = ext4_create_inline_data(handle, inode, inline_size);
1116         if (ret) {
1117                 ext4_msg(inode->i_sb, KERN_EMERG,
1118                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1119                         inode->i_ino, ret);
1120                 return;
1121         }
1122         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1123         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1124 }
1125
1126 static int ext4_finish_convert_inline_dir(handle_t *handle,
1127                                           struct inode *inode,
1128                                           struct buffer_head *dir_block,
1129                                           void *buf,
1130                                           int inline_size)
1131 {
1132         int err, csum_size = 0, header_size = 0;
1133         struct ext4_dir_entry_2 *de;
1134         void *target = dir_block->b_data;
1135
1136         /*
1137          * First create "." and ".." and then copy the dir information
1138          * back to the block.
1139          */
1140         de = target;
1141         de = ext4_init_dot_dotdot(inode, de,
1142                 inode->i_sb->s_blocksize, csum_size,
1143                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1144         header_size = (void *)de - target;
1145
1146         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1147                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1148
1149         if (ext4_has_metadata_csum(inode->i_sb))
1150                 csum_size = sizeof(struct ext4_dir_entry_tail);
1151
1152         inode->i_size = inode->i_sb->s_blocksize;
1153         i_size_write(inode, inode->i_sb->s_blocksize);
1154         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1155         ext4_update_final_de(dir_block->b_data,
1156                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1157                         inode->i_sb->s_blocksize - csum_size);
1158
1159         if (csum_size)
1160                 ext4_initialize_dirent_tail(dir_block,
1161                                             inode->i_sb->s_blocksize);
1162         set_buffer_uptodate(dir_block);
1163         unlock_buffer(dir_block);
1164         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1165         if (err)
1166                 return err;
1167         set_buffer_verified(dir_block);
1168         return ext4_mark_inode_dirty(handle, inode);
1169 }
1170
1171 static int ext4_convert_inline_data_nolock(handle_t *handle,
1172                                            struct inode *inode,
1173                                            struct ext4_iloc *iloc)
1174 {
1175         int error;
1176         void *buf = NULL;
1177         struct buffer_head *data_bh = NULL;
1178         struct ext4_map_blocks map;
1179         int inline_size;
1180
1181         inline_size = ext4_get_inline_size(inode);
1182         buf = kmalloc(inline_size, GFP_NOFS);
1183         if (!buf) {
1184                 error = -ENOMEM;
1185                 goto out;
1186         }
1187
1188         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1189         if (error < 0)
1190                 goto out;
1191
1192         /*
1193          * Make sure the inline directory entries pass checks before we try to
1194          * convert them, so that we avoid touching stuff that needs fsck.
1195          */
1196         if (S_ISDIR(inode->i_mode)) {
1197                 error = ext4_check_all_de(inode, iloc->bh,
1198                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1199                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1200                 if (error)
1201                         goto out;
1202         }
1203
1204         error = ext4_destroy_inline_data_nolock(handle, inode);
1205         if (error)
1206                 goto out;
1207
1208         map.m_lblk = 0;
1209         map.m_len = 1;
1210         map.m_flags = 0;
1211         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1212         if (error < 0)
1213                 goto out_restore;
1214         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1215                 error = -EIO;
1216                 goto out_restore;
1217         }
1218
1219         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1220         if (!data_bh) {
1221                 error = -ENOMEM;
1222                 goto out_restore;
1223         }
1224
1225         lock_buffer(data_bh);
1226         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1227                                                EXT4_JTR_NONE);
1228         if (error) {
1229                 unlock_buffer(data_bh);
1230                 error = -EIO;
1231                 goto out_restore;
1232         }
1233         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1234
1235         if (!S_ISDIR(inode->i_mode)) {
1236                 memcpy(data_bh->b_data, buf, inline_size);
1237                 set_buffer_uptodate(data_bh);
1238                 unlock_buffer(data_bh);
1239                 error = ext4_handle_dirty_metadata(handle,
1240                                                    inode, data_bh);
1241         } else {
1242                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1243                                                        buf, inline_size);
1244         }
1245
1246 out_restore:
1247         if (error)
1248                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1249
1250 out:
1251         brelse(data_bh);
1252         kfree(buf);
1253         return error;
1254 }
1255
1256 /*
1257  * Try to add the new entry to the inline data.
1258  * If succeeds, return 0. If not, extended the inline dir and copied data to
1259  * the new created block.
1260  */
1261 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1262                               struct inode *dir, struct inode *inode)
1263 {
1264         int ret, ret2, inline_size, no_expand;
1265         void *inline_start;
1266         struct ext4_iloc iloc;
1267
1268         ret = ext4_get_inode_loc(dir, &iloc);
1269         if (ret)
1270                 return ret;
1271
1272         ext4_write_lock_xattr(dir, &no_expand);
1273         if (!ext4_has_inline_data(dir))
1274                 goto out;
1275
1276         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1277                                                  EXT4_INLINE_DOTDOT_SIZE;
1278         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1279
1280         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1281                                         inline_start, inline_size);
1282         if (ret != -ENOSPC)
1283                 goto out;
1284
1285         /* check whether it can be inserted to inline xattr space. */
1286         inline_size = EXT4_I(dir)->i_inline_size -
1287                         EXT4_MIN_INLINE_DATA_SIZE;
1288         if (!inline_size) {
1289                 /* Try to use the xattr space.*/
1290                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1291                 if (ret && ret != -ENOSPC)
1292                         goto out;
1293
1294                 inline_size = EXT4_I(dir)->i_inline_size -
1295                                 EXT4_MIN_INLINE_DATA_SIZE;
1296         }
1297
1298         if (inline_size) {
1299                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1300
1301                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1302                                                 inode, &iloc, inline_start,
1303                                                 inline_size);
1304
1305                 if (ret != -ENOSPC)
1306                         goto out;
1307         }
1308
1309         /*
1310          * The inline space is filled up, so create a new block for it.
1311          * As the extent tree will be created, we have to save the inline
1312          * dir first.
1313          */
1314         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1315
1316 out:
1317         ext4_write_unlock_xattr(dir, &no_expand);
1318         ret2 = ext4_mark_inode_dirty(handle, dir);
1319         if (unlikely(ret2 && !ret))
1320                 ret = ret2;
1321         brelse(iloc.bh);
1322         return ret;
1323 }
1324
1325 /*
1326  * This function fills a red-black tree with information from an
1327  * inlined dir.  It returns the number directory entries loaded
1328  * into the tree.  If there is an error it is returned in err.
1329  */
1330 int ext4_inlinedir_to_tree(struct file *dir_file,
1331                            struct inode *dir, ext4_lblk_t block,
1332                            struct dx_hash_info *hinfo,
1333                            __u32 start_hash, __u32 start_minor_hash,
1334                            int *has_inline_data)
1335 {
1336         int err = 0, count = 0;
1337         unsigned int parent_ino;
1338         int pos;
1339         struct ext4_dir_entry_2 *de;
1340         struct inode *inode = file_inode(dir_file);
1341         int ret, inline_size = 0;
1342         struct ext4_iloc iloc;
1343         void *dir_buf = NULL;
1344         struct ext4_dir_entry_2 fake;
1345         struct fscrypt_str tmp_str;
1346
1347         ret = ext4_get_inode_loc(inode, &iloc);
1348         if (ret)
1349                 return ret;
1350
1351         down_read(&EXT4_I(inode)->xattr_sem);
1352         if (!ext4_has_inline_data(inode)) {
1353                 up_read(&EXT4_I(inode)->xattr_sem);
1354                 *has_inline_data = 0;
1355                 goto out;
1356         }
1357
1358         inline_size = ext4_get_inline_size(inode);
1359         dir_buf = kmalloc(inline_size, GFP_NOFS);
1360         if (!dir_buf) {
1361                 ret = -ENOMEM;
1362                 up_read(&EXT4_I(inode)->xattr_sem);
1363                 goto out;
1364         }
1365
1366         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1367         up_read(&EXT4_I(inode)->xattr_sem);
1368         if (ret < 0)
1369                 goto out;
1370
1371         pos = 0;
1372         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1373         while (pos < inline_size) {
1374                 /*
1375                  * As inlined dir doesn't store any information about '.' and
1376                  * only the inode number of '..' is stored, we have to handle
1377                  * them differently.
1378                  */
1379                 if (pos == 0) {
1380                         fake.inode = cpu_to_le32(inode->i_ino);
1381                         fake.name_len = 1;
1382                         strcpy(fake.name, ".");
1383                         fake.rec_len = ext4_rec_len_to_disk(
1384                                           ext4_dir_rec_len(fake.name_len, NULL),
1385                                           inline_size);
1386                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1387                         de = &fake;
1388                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1389                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1390                         fake.inode = cpu_to_le32(parent_ino);
1391                         fake.name_len = 2;
1392                         strcpy(fake.name, "..");
1393                         fake.rec_len = ext4_rec_len_to_disk(
1394                                           ext4_dir_rec_len(fake.name_len, NULL),
1395                                           inline_size);
1396                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1397                         de = &fake;
1398                         pos = EXT4_INLINE_DOTDOT_SIZE;
1399                 } else {
1400                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1401                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1402                         if (ext4_check_dir_entry(inode, dir_file, de,
1403                                          iloc.bh, dir_buf,
1404                                          inline_size, pos)) {
1405                                 ret = count;
1406                                 goto out;
1407                         }
1408                 }
1409
1410                 if (ext4_hash_in_dirent(dir)) {
1411                         hinfo->hash = EXT4_DIRENT_HASH(de);
1412                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1413                 } else {
1414                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1415                 }
1416                 if ((hinfo->hash < start_hash) ||
1417                     ((hinfo->hash == start_hash) &&
1418                      (hinfo->minor_hash < start_minor_hash)))
1419                         continue;
1420                 if (de->inode == 0)
1421                         continue;
1422                 tmp_str.name = de->name;
1423                 tmp_str.len = de->name_len;
1424                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1425                                               hinfo->minor_hash, de, &tmp_str);
1426                 if (err) {
1427                         ret = err;
1428                         goto out;
1429                 }
1430                 count++;
1431         }
1432         ret = count;
1433 out:
1434         kfree(dir_buf);
1435         brelse(iloc.bh);
1436         return ret;
1437 }
1438
1439 /*
1440  * So this function is called when the volume is mkfsed with
1441  * dir_index disabled. In order to keep f_pos persistent
1442  * after we convert from an inlined dir to a blocked based,
1443  * we just pretend that we are a normal dir and return the
1444  * offset as if '.' and '..' really take place.
1445  *
1446  */
1447 int ext4_read_inline_dir(struct file *file,
1448                          struct dir_context *ctx,
1449                          int *has_inline_data)
1450 {
1451         unsigned int offset, parent_ino;
1452         int i;
1453         struct ext4_dir_entry_2 *de;
1454         struct super_block *sb;
1455         struct inode *inode = file_inode(file);
1456         int ret, inline_size = 0;
1457         struct ext4_iloc iloc;
1458         void *dir_buf = NULL;
1459         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1460
1461         ret = ext4_get_inode_loc(inode, &iloc);
1462         if (ret)
1463                 return ret;
1464
1465         down_read(&EXT4_I(inode)->xattr_sem);
1466         if (!ext4_has_inline_data(inode)) {
1467                 up_read(&EXT4_I(inode)->xattr_sem);
1468                 *has_inline_data = 0;
1469                 goto out;
1470         }
1471
1472         inline_size = ext4_get_inline_size(inode);
1473         dir_buf = kmalloc(inline_size, GFP_NOFS);
1474         if (!dir_buf) {
1475                 ret = -ENOMEM;
1476                 up_read(&EXT4_I(inode)->xattr_sem);
1477                 goto out;
1478         }
1479
1480         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1481         up_read(&EXT4_I(inode)->xattr_sem);
1482         if (ret < 0)
1483                 goto out;
1484
1485         ret = 0;
1486         sb = inode->i_sb;
1487         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1488         offset = ctx->pos;
1489
1490         /*
1491          * dotdot_offset and dotdot_size is the real offset and
1492          * size for ".." and "." if the dir is block based while
1493          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1494          * So we will use extra_offset and extra_size to indicate them
1495          * during the inline dir iteration.
1496          */
1497         dotdot_offset = ext4_dir_rec_len(1, NULL);
1498         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1499         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1500         extra_size = extra_offset + inline_size;
1501
1502         /*
1503          * If the version has changed since the last call to
1504          * readdir(2), then we might be pointing to an invalid
1505          * dirent right now.  Scan from the start of the inline
1506          * dir to make sure.
1507          */
1508         if (!inode_eq_iversion(inode, file->f_version)) {
1509                 for (i = 0; i < extra_size && i < offset;) {
1510                         /*
1511                          * "." is with offset 0 and
1512                          * ".." is dotdot_offset.
1513                          */
1514                         if (!i) {
1515                                 i = dotdot_offset;
1516                                 continue;
1517                         } else if (i == dotdot_offset) {
1518                                 i = dotdot_size;
1519                                 continue;
1520                         }
1521                         /* for other entry, the real offset in
1522                          * the buf has to be tuned accordingly.
1523                          */
1524                         de = (struct ext4_dir_entry_2 *)
1525                                 (dir_buf + i - extra_offset);
1526                         /* It's too expensive to do a full
1527                          * dirent test each time round this
1528                          * loop, but we do have to test at
1529                          * least that it is non-zero.  A
1530                          * failure will be detected in the
1531                          * dirent test below. */
1532                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1533                                 < ext4_dir_rec_len(1, NULL))
1534                                 break;
1535                         i += ext4_rec_len_from_disk(de->rec_len,
1536                                                     extra_size);
1537                 }
1538                 offset = i;
1539                 ctx->pos = offset;
1540                 file->f_version = inode_query_iversion(inode);
1541         }
1542
1543         while (ctx->pos < extra_size) {
1544                 if (ctx->pos == 0) {
1545                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1546                                 goto out;
1547                         ctx->pos = dotdot_offset;
1548                         continue;
1549                 }
1550
1551                 if (ctx->pos == dotdot_offset) {
1552                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1553                                 goto out;
1554                         ctx->pos = dotdot_size;
1555                         continue;
1556                 }
1557
1558                 de = (struct ext4_dir_entry_2 *)
1559                         (dir_buf + ctx->pos - extra_offset);
1560                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1561                                          extra_size, ctx->pos))
1562                         goto out;
1563                 if (le32_to_cpu(de->inode)) {
1564                         if (!dir_emit(ctx, de->name, de->name_len,
1565                                       le32_to_cpu(de->inode),
1566                                       get_dtype(sb, de->file_type)))
1567                                 goto out;
1568                 }
1569                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1570         }
1571 out:
1572         kfree(dir_buf);
1573         brelse(iloc.bh);
1574         return ret;
1575 }
1576
1577 void *ext4_read_inline_link(struct inode *inode)
1578 {
1579         struct ext4_iloc iloc;
1580         int ret, inline_size;
1581         void *link;
1582
1583         ret = ext4_get_inode_loc(inode, &iloc);
1584         if (ret)
1585                 return ERR_PTR(ret);
1586
1587         ret = -ENOMEM;
1588         inline_size = ext4_get_inline_size(inode);
1589         link = kmalloc(inline_size + 1, GFP_NOFS);
1590         if (!link)
1591                 goto out;
1592
1593         ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1594         if (ret < 0) {
1595                 kfree(link);
1596                 goto out;
1597         }
1598         nd_terminate_link(link, inode->i_size, ret);
1599 out:
1600         if (ret < 0)
1601                 link = ERR_PTR(ret);
1602         brelse(iloc.bh);
1603         return link;
1604 }
1605
1606 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1607                                         struct ext4_dir_entry_2 **parent_de,
1608                                         int *retval)
1609 {
1610         struct ext4_iloc iloc;
1611
1612         *retval = ext4_get_inode_loc(inode, &iloc);
1613         if (*retval)
1614                 return NULL;
1615
1616         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1617
1618         return iloc.bh;
1619 }
1620
1621 /*
1622  * Try to create the inline data for the new dir.
1623  * If it succeeds, return 0, otherwise return the error.
1624  * In case of ENOSPC, the caller should create the normal disk layout dir.
1625  */
1626 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1627                                struct inode *inode)
1628 {
1629         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1630         struct ext4_iloc iloc;
1631         struct ext4_dir_entry_2 *de;
1632
1633         ret = ext4_get_inode_loc(inode, &iloc);
1634         if (ret)
1635                 return ret;
1636
1637         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1638         if (ret)
1639                 goto out;
1640
1641         /*
1642          * For inline dir, we only save the inode information for the ".."
1643          * and create a fake dentry to cover the left space.
1644          */
1645         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1646         de->inode = cpu_to_le32(parent->i_ino);
1647         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1648         de->inode = 0;
1649         de->rec_len = ext4_rec_len_to_disk(
1650                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1651                                 inline_size);
1652         set_nlink(inode, 2);
1653         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1654 out:
1655         brelse(iloc.bh);
1656         return ret;
1657 }
1658
1659 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1660                                         struct ext4_filename *fname,
1661                                         struct ext4_dir_entry_2 **res_dir,
1662                                         int *has_inline_data)
1663 {
1664         int ret;
1665         struct ext4_iloc iloc;
1666         void *inline_start;
1667         int inline_size;
1668
1669         if (ext4_get_inode_loc(dir, &iloc))
1670                 return NULL;
1671
1672         down_read(&EXT4_I(dir)->xattr_sem);
1673         if (!ext4_has_inline_data(dir)) {
1674                 *has_inline_data = 0;
1675                 goto out;
1676         }
1677
1678         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1679                                                 EXT4_INLINE_DOTDOT_SIZE;
1680         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1681         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1682                               dir, fname, 0, res_dir);
1683         if (ret == 1)
1684                 goto out_find;
1685         if (ret < 0)
1686                 goto out;
1687
1688         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1689                 goto out;
1690
1691         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1692         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1693
1694         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1695                               dir, fname, 0, res_dir);
1696         if (ret == 1)
1697                 goto out_find;
1698
1699 out:
1700         brelse(iloc.bh);
1701         iloc.bh = NULL;
1702 out_find:
1703         up_read(&EXT4_I(dir)->xattr_sem);
1704         return iloc.bh;
1705 }
1706
1707 int ext4_delete_inline_entry(handle_t *handle,
1708                              struct inode *dir,
1709                              struct ext4_dir_entry_2 *de_del,
1710                              struct buffer_head *bh,
1711                              int *has_inline_data)
1712 {
1713         int err, inline_size, no_expand;
1714         struct ext4_iloc iloc;
1715         void *inline_start;
1716
1717         err = ext4_get_inode_loc(dir, &iloc);
1718         if (err)
1719                 return err;
1720
1721         ext4_write_lock_xattr(dir, &no_expand);
1722         if (!ext4_has_inline_data(dir)) {
1723                 *has_inline_data = 0;
1724                 goto out;
1725         }
1726
1727         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1728                 EXT4_MIN_INLINE_DATA_SIZE) {
1729                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1730                                         EXT4_INLINE_DOTDOT_SIZE;
1731                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1732                                 EXT4_INLINE_DOTDOT_SIZE;
1733         } else {
1734                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1735                 inline_size = ext4_get_inline_size(dir) -
1736                                 EXT4_MIN_INLINE_DATA_SIZE;
1737         }
1738
1739         BUFFER_TRACE(bh, "get_write_access");
1740         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1741                                             EXT4_JTR_NONE);
1742         if (err)
1743                 goto out;
1744
1745         err = ext4_generic_delete_entry(dir, de_del, bh,
1746                                         inline_start, inline_size, 0);
1747         if (err)
1748                 goto out;
1749
1750         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1751 out:
1752         ext4_write_unlock_xattr(dir, &no_expand);
1753         if (likely(err == 0))
1754                 err = ext4_mark_inode_dirty(handle, dir);
1755         brelse(iloc.bh);
1756         if (err != -ENOENT)
1757                 ext4_std_error(dir->i_sb, err);
1758         return err;
1759 }
1760
1761 /*
1762  * Get the inline dentry at offset.
1763  */
1764 static inline struct ext4_dir_entry_2 *
1765 ext4_get_inline_entry(struct inode *inode,
1766                       struct ext4_iloc *iloc,
1767                       unsigned int offset,
1768                       void **inline_start,
1769                       int *inline_size)
1770 {
1771         void *inline_pos;
1772
1773         BUG_ON(offset > ext4_get_inline_size(inode));
1774
1775         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1776                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1777                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1778         } else {
1779                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1780                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1781                 *inline_size = ext4_get_inline_size(inode) -
1782                                 EXT4_MIN_INLINE_DATA_SIZE;
1783         }
1784
1785         if (inline_start)
1786                 *inline_start = inline_pos;
1787         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1788 }
1789
1790 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1791 {
1792         int err, inline_size;
1793         struct ext4_iloc iloc;
1794         size_t inline_len;
1795         void *inline_pos;
1796         unsigned int offset;
1797         struct ext4_dir_entry_2 *de;
1798         bool ret = false;
1799
1800         err = ext4_get_inode_loc(dir, &iloc);
1801         if (err) {
1802                 EXT4_ERROR_INODE_ERR(dir, -err,
1803                                      "error %d getting inode %lu block",
1804                                      err, dir->i_ino);
1805                 return false;
1806         }
1807
1808         down_read(&EXT4_I(dir)->xattr_sem);
1809         if (!ext4_has_inline_data(dir)) {
1810                 *has_inline_data = 0;
1811                 ret = true;
1812                 goto out;
1813         }
1814
1815         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1816         if (!le32_to_cpu(de->inode)) {
1817                 ext4_warning(dir->i_sb,
1818                              "bad inline directory (dir #%lu) - no `..'",
1819                              dir->i_ino);
1820                 goto out;
1821         }
1822
1823         inline_len = ext4_get_inline_size(dir);
1824         offset = EXT4_INLINE_DOTDOT_SIZE;
1825         while (offset < inline_len) {
1826                 de = ext4_get_inline_entry(dir, &iloc, offset,
1827                                            &inline_pos, &inline_size);
1828                 if (ext4_check_dir_entry(dir, NULL, de,
1829                                          iloc.bh, inline_pos,
1830                                          inline_size, offset)) {
1831                         ext4_warning(dir->i_sb,
1832                                      "bad inline directory (dir #%lu) - "
1833                                      "inode %u, rec_len %u, name_len %d"
1834                                      "inline size %d",
1835                                      dir->i_ino, le32_to_cpu(de->inode),
1836                                      le16_to_cpu(de->rec_len), de->name_len,
1837                                      inline_size);
1838                         goto out;
1839                 }
1840                 if (le32_to_cpu(de->inode)) {
1841                         goto out;
1842                 }
1843                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1844         }
1845
1846         ret = true;
1847 out:
1848         up_read(&EXT4_I(dir)->xattr_sem);
1849         brelse(iloc.bh);
1850         return ret;
1851 }
1852
1853 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1854 {
1855         int ret, no_expand;
1856
1857         ext4_write_lock_xattr(inode, &no_expand);
1858         ret = ext4_destroy_inline_data_nolock(handle, inode);
1859         ext4_write_unlock_xattr(inode, &no_expand);
1860
1861         return ret;
1862 }
1863
1864 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1865 {
1866         __u64 addr;
1867         int error = -EAGAIN;
1868         struct ext4_iloc iloc;
1869
1870         down_read(&EXT4_I(inode)->xattr_sem);
1871         if (!ext4_has_inline_data(inode))
1872                 goto out;
1873
1874         error = ext4_get_inode_loc(inode, &iloc);
1875         if (error)
1876                 goto out;
1877
1878         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1879         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1880         addr += offsetof(struct ext4_inode, i_block);
1881
1882         brelse(iloc.bh);
1883
1884         iomap->addr = addr;
1885         iomap->offset = 0;
1886         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1887                               i_size_read(inode));
1888         iomap->type = IOMAP_INLINE;
1889         iomap->flags = 0;
1890
1891 out:
1892         up_read(&EXT4_I(inode)->xattr_sem);
1893         return error;
1894 }
1895
1896 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1897 {
1898         handle_t *handle;
1899         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1900         size_t i_size;
1901         void *value = NULL;
1902         struct ext4_xattr_ibody_find is = {
1903                 .s = { .not_found = -ENODATA, },
1904         };
1905         struct ext4_xattr_info i = {
1906                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1907                 .name = EXT4_XATTR_SYSTEM_DATA,
1908         };
1909
1910
1911         needed_blocks = ext4_writepage_trans_blocks(inode);
1912         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1913         if (IS_ERR(handle))
1914                 return PTR_ERR(handle);
1915
1916         ext4_write_lock_xattr(inode, &no_expand);
1917         if (!ext4_has_inline_data(inode)) {
1918                 ext4_write_unlock_xattr(inode, &no_expand);
1919                 *has_inline = 0;
1920                 ext4_journal_stop(handle);
1921                 return 0;
1922         }
1923
1924         if ((err = ext4_orphan_add(handle, inode)) != 0)
1925                 goto out;
1926
1927         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1928                 goto out;
1929
1930         down_write(&EXT4_I(inode)->i_data_sem);
1931         i_size = inode->i_size;
1932         inline_size = ext4_get_inline_size(inode);
1933         EXT4_I(inode)->i_disksize = i_size;
1934
1935         if (i_size < inline_size) {
1936                 /*
1937                  * if there's inline data to truncate and this file was
1938                  * converted to extents after that inline data was written,
1939                  * the extent status cache must be cleared to avoid leaving
1940                  * behind stale delayed allocated extent entries
1941                  */
1942                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1943                         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1944
1945                 /* Clear the content in the xattr space. */
1946                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1947                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1948                                 goto out_error;
1949
1950                         BUG_ON(is.s.not_found);
1951
1952                         value_len = le32_to_cpu(is.s.here->e_value_size);
1953                         value = kmalloc(value_len, GFP_NOFS);
1954                         if (!value) {
1955                                 err = -ENOMEM;
1956                                 goto out_error;
1957                         }
1958
1959                         err = ext4_xattr_ibody_get(inode, i.name_index,
1960                                                    i.name, value, value_len);
1961                         if (err <= 0)
1962                                 goto out_error;
1963
1964                         i.value = value;
1965                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1966                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1967                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1968                         if (err)
1969                                 goto out_error;
1970                 }
1971
1972                 /* Clear the content within i_blocks. */
1973                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1974                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1975                         memset(p + i_size, 0,
1976                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1977                 }
1978
1979                 EXT4_I(inode)->i_inline_size = i_size <
1980                                         EXT4_MIN_INLINE_DATA_SIZE ?
1981                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1982         }
1983
1984 out_error:
1985         up_write(&EXT4_I(inode)->i_data_sem);
1986 out:
1987         brelse(is.iloc.bh);
1988         ext4_write_unlock_xattr(inode, &no_expand);
1989         kfree(value);
1990         if (inode->i_nlink)
1991                 ext4_orphan_del(handle, inode);
1992
1993         if (err == 0) {
1994                 inode->i_mtime = inode_set_ctime_current(inode);
1995                 err = ext4_mark_inode_dirty(handle, inode);
1996                 if (IS_SYNC(inode))
1997                         ext4_handle_sync(handle);
1998         }
1999         ext4_journal_stop(handle);
2000         return err;
2001 }
2002
2003 int ext4_convert_inline_data(struct inode *inode)
2004 {
2005         int error, needed_blocks, no_expand;
2006         handle_t *handle;
2007         struct ext4_iloc iloc;
2008
2009         if (!ext4_has_inline_data(inode)) {
2010                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2011                 return 0;
2012         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2013                 /*
2014                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2015                  * cleared. This means we are in the middle of moving of
2016                  * inline data to delay allocated block. Just force writeout
2017                  * here to finish conversion.
2018                  */
2019                 error = filemap_flush(inode->i_mapping);
2020                 if (error)
2021                         return error;
2022                 if (!ext4_has_inline_data(inode))
2023                         return 0;
2024         }
2025
2026         needed_blocks = ext4_writepage_trans_blocks(inode);
2027
2028         iloc.bh = NULL;
2029         error = ext4_get_inode_loc(inode, &iloc);
2030         if (error)
2031                 return error;
2032
2033         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2034         if (IS_ERR(handle)) {
2035                 error = PTR_ERR(handle);
2036                 goto out_free;
2037         }
2038
2039         ext4_write_lock_xattr(inode, &no_expand);
2040         if (ext4_has_inline_data(inode))
2041                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2042         ext4_write_unlock_xattr(inode, &no_expand);
2043         ext4_journal_stop(handle);
2044 out_free:
2045         brelse(iloc.bh);
2046         return error;
2047 }