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(EXT4_SB(inode->i_sb))))
 232                 return;
 233
 234         BUG_ON(!EXT4_I(inode)->i_inline_off);
 235         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 236
 237         raw_inode = ext4_raw_inode(iloc);
 238         buffer += pos;
 239
 240         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 241                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 242                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 243                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 244
 245                 len -= cp_len;
 246                 buffer += cp_len;
 247                 pos += cp_len;
 248         }
 249
 250         if (!len)
 251                 return;
 252
 253         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 254         header = IHDR(inode, raw_inode);
 255         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 256                                             EXT4_I(inode)->i_inline_off);
 257
 258         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 259                buffer, len);
 260 }
 261
 262 static int ext4_create_inline_data(handle_t *handle,
 263                                    struct inode *inode, unsigned len)
 264 {
 265         int error;
 266         void *value = NULL;
 267         struct ext4_xattr_ibody_find is = {
 268                 .s = { .not_found = -ENODATA, },
 269         };
 270         struct ext4_xattr_info i = {
 271                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 272                 .name = EXT4_XATTR_SYSTEM_DATA,
 273         };
 274
 275         error = ext4_get_inode_loc(inode, &is.iloc);
 276         if (error)
 277                 return error;
 278
 279         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 280         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 281                                               EXT4_JTR_NONE);
 282         if (error)
 283                 goto out;
 284
 285         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 286                 value = EXT4_ZERO_XATTR_VALUE;
 287                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 288         } else {
 289                 value = "";
 290                 len = 0;
 291         }
 292
 293         /* Insert the xttr entry. */
 294         i.value = value;
 295         i.value_len = len;
 296
 297         error = ext4_xattr_ibody_find(inode, &i, &is);
 298         if (error)
 299                 goto out;
 300
 301         BUG_ON(!is.s.not_found);
 302
 303         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 304         if (error) {
 305                 if (error == -ENOSPC)
 306                         ext4_clear_inode_state(inode,
 307                                                EXT4_STATE_MAY_INLINE_DATA);
 308                 goto out;
 309         }
 310
 311         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 312                 0, EXT4_MIN_INLINE_DATA_SIZE);
 313
 314         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 315                                       (void *)ext4_raw_inode(&is.iloc));
 316         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 317         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 318         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 319         get_bh(is.iloc.bh);
 320         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 321
 322 out:
 323         brelse(is.iloc.bh);
 324         return error;
 325 }
 326
 327 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 328                                    unsigned int len)
 329 {
 330         int error;
 331         void *value = NULL;
 332         struct ext4_xattr_ibody_find is = {
 333                 .s = { .not_found = -ENODATA, },
 334         };
 335         struct ext4_xattr_info i = {
 336                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 337                 .name = EXT4_XATTR_SYSTEM_DATA,
 338         };
 339
 340         /* If the old space is ok, write the data directly. */
 341         if (len <= EXT4_I(inode)->i_inline_size)
 342                 return 0;
 343
 344         error = ext4_get_inode_loc(inode, &is.iloc);
 345         if (error)
 346                 return error;
 347
 348         error = ext4_xattr_ibody_find(inode, &i, &is);
 349         if (error)
 350                 goto out;
 351
 352         BUG_ON(is.s.not_found);
 353
 354         len -= EXT4_MIN_INLINE_DATA_SIZE;
 355         value = kzalloc(len, GFP_NOFS);
 356         if (!value) {
 357                 error = -ENOMEM;
 358                 goto out;
 359         }
 360
 361         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 362                                      value, len);
 363         if (error == -ENODATA)
 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 page *page)
 745 {
 746         struct folio *folio = page_folio(page);
 747         handle_t *handle = ext4_journal_current_handle();
 748         int no_expand;
 749         void *kaddr;
 750         struct ext4_iloc iloc;
 751         int ret = 0, ret2;
 752
 753         if (unlikely(copied < len) && !folio_test_uptodate(folio))
 754                 copied = 0;
 755
 756         if (likely(copied)) {
 757                 ret = ext4_get_inode_loc(inode, &iloc);
 758                 if (ret) {
 759                         folio_unlock(folio);
 760                         folio_put(folio);
 761                         ext4_std_error(inode->i_sb, ret);
 762                         goto out;
 763                 }
 764                 ext4_write_lock_xattr(inode, &no_expand);
 765                 BUG_ON(!ext4_has_inline_data(inode));
 766
 767                 /*
 768                  * ei->i_inline_off may have changed since
 769                  * ext4_write_begin() called
 770                  * ext4_try_to_write_inline_data()
 771                  */
 772                 (void) ext4_find_inline_data_nolock(inode);
 773
 774                 kaddr = kmap_local_folio(folio, 0);
 775                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 776                 kunmap_local(kaddr);
 777                 folio_mark_uptodate(folio);
 778                 /* clear dirty flag so that writepages wouldn't work for us. */
 779                 folio_clear_dirty(folio);
 780
 781                 ext4_write_unlock_xattr(inode, &no_expand);
 782                 brelse(iloc.bh);
 783
 784                 /*
 785                  * It's important to update i_size while still holding folio
 786                  * lock: page writeout could otherwise come in and zero
 787                  * beyond i_size.
 788                  */
 789                 ext4_update_inode_size(inode, pos + copied);
 790         }
 791         folio_unlock(folio);
 792         folio_put(folio);
 793
 794         /*
 795          * Don't mark the inode dirty under folio lock. First, it unnecessarily
 796          * makes the holding time of folio lock longer. Second, it forces lock
 797          * ordering of folio lock and transaction start for journaling
 798          * filesystems.
 799          */
 800         if (likely(copied))
 801                 mark_inode_dirty(inode);
 802 out:
 803         /*
 804          * If we didn't copy as much data as expected, we need to trim back
 805          * size of xattr containing inline data.
 806          */
 807         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 808                 ext4_orphan_add(handle, inode);
 809
 810         ret2 = ext4_journal_stop(handle);
 811         if (!ret)
 812                 ret = ret2;
 813         if (pos + len > inode->i_size) {
 814                 ext4_truncate_failed_write(inode);
 815                 /*
 816                  * If truncate failed early the inode might still be
 817                  * on the orphan list; we need to make sure the inode
 818                  * is removed from the orphan list in that case.
 819                  */
 820                 if (inode->i_nlink)
 821                         ext4_orphan_del(NULL, inode);
 822         }
 823         return ret ? ret : copied;
 824 }
 825
 826 struct buffer_head *
 827 ext4_journalled_write_inline_data(struct inode *inode,
 828                                   unsigned len,
 829                                   struct page *page)
 830 {
 831         int ret, no_expand;
 832         void *kaddr;
 833         struct ext4_iloc iloc;
 834
 835         ret = ext4_get_inode_loc(inode, &iloc);
 836         if (ret) {
 837                 ext4_std_error(inode->i_sb, ret);
 838                 return NULL;
 839         }
 840
 841         ext4_write_lock_xattr(inode, &no_expand);
 842         kaddr = kmap_atomic(page);
 843         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 844         kunmap_atomic(kaddr);
 845         ext4_write_unlock_xattr(inode, &no_expand);
 846
 847         return iloc.bh;
 848 }
 849
 850 /*
 851  * Try to make the page cache and handle ready for the inline data case.
 852  * We can call this function in 2 cases:
 853  * 1. The inode is created and the first write exceeds inline size. We can
 854  *    clear the inode state safely.
 855  * 2. The inode has inline data, then we need to read the data, make it
 856  *    update and dirty so that ext4_da_writepages can handle it. We don't
 857  *    need to start the journal since the file's metadata isn't changed now.
 858  */
 859 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 860                                                  struct inode *inode,
 861                                                  void **fsdata)
 862 {
 863         int ret = 0, inline_size;
 864         struct folio *folio;
 865
 866         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 867                                         mapping_gfp_mask(mapping));
 868         if (IS_ERR(folio))
 869                 return PTR_ERR(folio);
 870
 871         down_read(&EXT4_I(inode)->xattr_sem);
 872         if (!ext4_has_inline_data(inode)) {
 873                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 874                 goto out;
 875         }
 876
 877         inline_size = ext4_get_inline_size(inode);
 878
 879         if (!folio_test_uptodate(folio)) {
 880                 ret = ext4_read_inline_folio(inode, folio);
 881                 if (ret < 0)
 882                         goto out;
 883         }
 884
 885         ret = __block_write_begin(&folio->page, 0, inline_size,
 886                                   ext4_da_get_block_prep);
 887         if (ret) {
 888                 up_read(&EXT4_I(inode)->xattr_sem);
 889                 folio_unlock(folio);
 890                 folio_put(folio);
 891                 ext4_truncate_failed_write(inode);
 892                 return ret;
 893         }
 894
 895         folio_mark_dirty(folio);
 896         folio_mark_uptodate(folio);
 897         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 898         *fsdata = (void *)CONVERT_INLINE_DATA;
 899
 900 out:
 901         up_read(&EXT4_I(inode)->xattr_sem);
 902         if (folio) {
 903                 folio_unlock(folio);
 904                 folio_put(folio);
 905         }
 906         return ret;
 907 }
 908
 909 /*
 910  * Prepare the write for the inline data.
 911  * If the data can be written into the inode, we just read
 912  * the page and make it uptodate, and start the journal.
 913  * Otherwise read the page, makes it dirty so that it can be
 914  * handle in writepages(the i_disksize update is left to the
 915  * normal ext4_da_write_end).
 916  */
 917 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 918                                     struct inode *inode,
 919                                     loff_t pos, unsigned len,
 920                                     struct page **pagep,
 921                                     void **fsdata)
 922 {
 923         int ret;
 924         handle_t *handle;
 925         struct folio *folio;
 926         struct ext4_iloc iloc;
 927         int retries = 0;
 928
 929         ret = ext4_get_inode_loc(inode, &iloc);
 930         if (ret)
 931                 return ret;
 932
 933 retry_journal:
 934         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 935         if (IS_ERR(handle)) {
 936                 ret = PTR_ERR(handle);
 937                 goto out;
 938         }
 939
 940         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 941         if (ret && ret != -ENOSPC)
 942                 goto out_journal;
 943
 944         if (ret == -ENOSPC) {
 945                 ext4_journal_stop(handle);
 946                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 947                                                             inode,
 948                                                             fsdata);
 949                 if (ret == -ENOSPC &&
 950                     ext4_should_retry_alloc(inode->i_sb, &retries))
 951                         goto retry_journal;
 952                 goto out;
 953         }
 954
 955         /*
 956          * We cannot recurse into the filesystem as the transaction
 957          * is already started.
 958          */
 959         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 960                                         mapping_gfp_mask(mapping));
 961         if (IS_ERR(folio)) {
 962                 ret = PTR_ERR(folio);
 963                 goto out_journal;
 964         }
 965
 966         down_read(&EXT4_I(inode)->xattr_sem);
 967         if (!ext4_has_inline_data(inode)) {
 968                 ret = 0;
 969                 goto out_release_page;
 970         }
 971
 972         if (!folio_test_uptodate(folio)) {
 973                 ret = ext4_read_inline_folio(inode, folio);
 974                 if (ret < 0)
 975                         goto out_release_page;
 976         }
 977         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 978                                             EXT4_JTR_NONE);
 979         if (ret)
 980                 goto out_release_page;
 981
 982         up_read(&EXT4_I(inode)->xattr_sem);
 983         *pagep = &folio->page;
 984         brelse(iloc.bh);
 985         return 1;
 986 out_release_page:
 987         up_read(&EXT4_I(inode)->xattr_sem);
 988         folio_unlock(folio);
 989         folio_put(folio);
 990 out_journal:
 991         ext4_journal_stop(handle);
 992 out:
 993         brelse(iloc.bh);
 994         return ret;
 995 }
 996
 997 #ifdef INLINE_DIR_DEBUG
 998 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 999                           void *inline_start, int inline_size)
1000 {
1001         int offset;
1002         unsigned short de_len;
1003         struct ext4_dir_entry_2 *de = inline_start;
1004         void *dlimit = inline_start + inline_size;
1005
1006         trace_printk("inode %lu\n", dir->i_ino);
1007         offset = 0;
1008         while ((void *)de < dlimit) {
1009                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1010                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1011                              offset, de_len, de->name_len, de->name,
1012                              de->name_len, le32_to_cpu(de->inode));
1013                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1014                                          inline_start, inline_size, offset))
1015                         BUG();
1016
1017                 offset += de_len;
1018                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1019         }
1020 }
1021 #else
1022 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1023 #endif
1024
1025 /*
1026  * Add a new entry into a inline dir.
1027  * It will return -ENOSPC if no space is available, and -EIO
1028  * and -EEXIST if directory entry already exists.
1029  */
1030 static int ext4_add_dirent_to_inline(handle_t *handle,
1031                                      struct ext4_filename *fname,
1032                                      struct inode *dir,
1033                                      struct inode *inode,
1034                                      struct ext4_iloc *iloc,
1035                                      void *inline_start, int inline_size)
1036 {
1037         int             err;
1038         struct ext4_dir_entry_2 *de;
1039
1040         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1041                                 inline_size, fname, &de);
1042         if (err)
1043                 return err;
1044
1045         BUFFER_TRACE(iloc->bh, "get_write_access");
1046         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1047                                             EXT4_JTR_NONE);
1048         if (err)
1049                 return err;
1050         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1051
1052         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1053
1054         /*
1055          * XXX shouldn't update any times until successful
1056          * completion of syscall, but too many callers depend
1057          * on this.
1058          *
1059          * XXX similarly, too many callers depend on
1060          * ext4_new_inode() setting the times, but error
1061          * recovery deletes the inode, so the worst that can
1062          * happen is that the times are slightly out of date
1063          * and/or different from the directory change time.
1064          */
1065         dir->i_mtime = dir->i_ctime = current_time(dir);
1066         ext4_update_dx_flag(dir);
1067         inode_inc_iversion(dir);
1068         return 1;
1069 }
1070
1071 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1072                                        struct ext4_iloc *iloc)
1073 {
1074         struct ext4_xattr_entry *entry;
1075         struct ext4_xattr_ibody_header *header;
1076
1077         BUG_ON(!EXT4_I(inode)->i_inline_off);
1078
1079         header = IHDR(inode, ext4_raw_inode(iloc));
1080         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1081                                             EXT4_I(inode)->i_inline_off);
1082
1083         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1084 }
1085
1086 /* Set the final de to cover the whole block. */
1087 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1088 {
1089         struct ext4_dir_entry_2 *de, *prev_de;
1090         void *limit;
1091         int de_len;
1092
1093         de = de_buf;
1094         if (old_size) {
1095                 limit = de_buf + old_size;
1096                 do {
1097                         prev_de = de;
1098                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1099                         de_buf += de_len;
1100                         de = de_buf;
1101                 } while (de_buf < limit);
1102
1103                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1104                                                         old_size, new_size);
1105         } else {
1106                 /* this is just created, so create an empty entry. */
1107                 de->inode = 0;
1108                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1109         }
1110 }
1111
1112 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1113                                   struct ext4_iloc *iloc)
1114 {
1115         int ret;
1116         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1117         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1118
1119         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1120                 return -ENOSPC;
1121
1122         ret = ext4_update_inline_data(handle, dir,
1123                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1124         if (ret)
1125                 return ret;
1126
1127         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1128                              EXT4_I(dir)->i_inline_size -
1129                                                 EXT4_MIN_INLINE_DATA_SIZE);
1130         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1131         return 0;
1132 }
1133
1134 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1135                                      struct ext4_iloc *iloc,
1136                                      void *buf, int inline_size)
1137 {
1138         int ret;
1139
1140         ret = ext4_create_inline_data(handle, inode, inline_size);
1141         if (ret) {
1142                 ext4_msg(inode->i_sb, KERN_EMERG,
1143                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1144                         inode->i_ino, ret);
1145                 return;
1146         }
1147         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1148         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1149 }
1150
1151 static int ext4_finish_convert_inline_dir(handle_t *handle,
1152                                           struct inode *inode,
1153                                           struct buffer_head *dir_block,
1154                                           void *buf,
1155                                           int inline_size)
1156 {
1157         int err, csum_size = 0, header_size = 0;
1158         struct ext4_dir_entry_2 *de;
1159         void *target = dir_block->b_data;
1160
1161         /*
1162          * First create "." and ".." and then copy the dir information
1163          * back to the block.
1164          */
1165         de = target;
1166         de = ext4_init_dot_dotdot(inode, de,
1167                 inode->i_sb->s_blocksize, csum_size,
1168                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1169         header_size = (void *)de - target;
1170
1171         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1172                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1173
1174         if (ext4_has_metadata_csum(inode->i_sb))
1175                 csum_size = sizeof(struct ext4_dir_entry_tail);
1176
1177         inode->i_size = inode->i_sb->s_blocksize;
1178         i_size_write(inode, inode->i_sb->s_blocksize);
1179         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1180         ext4_update_final_de(dir_block->b_data,
1181                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1182                         inode->i_sb->s_blocksize - csum_size);
1183
1184         if (csum_size)
1185                 ext4_initialize_dirent_tail(dir_block,
1186                                             inode->i_sb->s_blocksize);
1187         set_buffer_uptodate(dir_block);
1188         unlock_buffer(dir_block);
1189         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1190         if (err)
1191                 return err;
1192         set_buffer_verified(dir_block);
1193         return ext4_mark_inode_dirty(handle, inode);
1194 }
1195
1196 static int ext4_convert_inline_data_nolock(handle_t *handle,
1197                                            struct inode *inode,
1198                                            struct ext4_iloc *iloc)
1199 {
1200         int error;
1201         void *buf = NULL;
1202         struct buffer_head *data_bh = NULL;
1203         struct ext4_map_blocks map;
1204         int inline_size;
1205
1206         inline_size = ext4_get_inline_size(inode);
1207         buf = kmalloc(inline_size, GFP_NOFS);
1208         if (!buf) {
1209                 error = -ENOMEM;
1210                 goto out;
1211         }
1212
1213         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1214         if (error < 0)
1215                 goto out;
1216
1217         /*
1218          * Make sure the inline directory entries pass checks before we try to
1219          * convert them, so that we avoid touching stuff that needs fsck.
1220          */
1221         if (S_ISDIR(inode->i_mode)) {
1222                 error = ext4_check_all_de(inode, iloc->bh,
1223                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1224                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1225                 if (error)
1226                         goto out;
1227         }
1228
1229         error = ext4_destroy_inline_data_nolock(handle, inode);
1230         if (error)
1231                 goto out;
1232
1233         map.m_lblk = 0;
1234         map.m_len = 1;
1235         map.m_flags = 0;
1236         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1237         if (error < 0)
1238                 goto out_restore;
1239         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1240                 error = -EIO;
1241                 goto out_restore;
1242         }
1243
1244         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1245         if (!data_bh) {
1246                 error = -ENOMEM;
1247                 goto out_restore;
1248         }
1249
1250         lock_buffer(data_bh);
1251         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1252                                                EXT4_JTR_NONE);
1253         if (error) {
1254                 unlock_buffer(data_bh);
1255                 error = -EIO;
1256                 goto out_restore;
1257         }
1258         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1259
1260         if (!S_ISDIR(inode->i_mode)) {
1261                 memcpy(data_bh->b_data, buf, inline_size);
1262                 set_buffer_uptodate(data_bh);
1263                 unlock_buffer(data_bh);
1264                 error = ext4_handle_dirty_metadata(handle,
1265                                                    inode, data_bh);
1266         } else {
1267                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1268                                                        buf, inline_size);
1269         }
1270
1271 out_restore:
1272         if (error)
1273                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1274
1275 out:
1276         brelse(data_bh);
1277         kfree(buf);
1278         return error;
1279 }
1280
1281 /*
1282  * Try to add the new entry to the inline data.
1283  * If succeeds, return 0. If not, extended the inline dir and copied data to
1284  * the new created block.
1285  */
1286 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1287                               struct inode *dir, struct inode *inode)
1288 {
1289         int ret, ret2, inline_size, no_expand;
1290         void *inline_start;
1291         struct ext4_iloc iloc;
1292
1293         ret = ext4_get_inode_loc(dir, &iloc);
1294         if (ret)
1295                 return ret;
1296
1297         ext4_write_lock_xattr(dir, &no_expand);
1298         if (!ext4_has_inline_data(dir))
1299                 goto out;
1300
1301         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1302                                                  EXT4_INLINE_DOTDOT_SIZE;
1303         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1304
1305         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1306                                         inline_start, inline_size);
1307         if (ret != -ENOSPC)
1308                 goto out;
1309
1310         /* check whether it can be inserted to inline xattr space. */
1311         inline_size = EXT4_I(dir)->i_inline_size -
1312                         EXT4_MIN_INLINE_DATA_SIZE;
1313         if (!inline_size) {
1314                 /* Try to use the xattr space.*/
1315                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1316                 if (ret && ret != -ENOSPC)
1317                         goto out;
1318
1319                 inline_size = EXT4_I(dir)->i_inline_size -
1320                                 EXT4_MIN_INLINE_DATA_SIZE;
1321         }
1322
1323         if (inline_size) {
1324                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1325
1326                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1327                                                 inode, &iloc, inline_start,
1328                                                 inline_size);
1329
1330                 if (ret != -ENOSPC)
1331                         goto out;
1332         }
1333
1334         /*
1335          * The inline space is filled up, so create a new block for it.
1336          * As the extent tree will be created, we have to save the inline
1337          * dir first.
1338          */
1339         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1340
1341 out:
1342         ext4_write_unlock_xattr(dir, &no_expand);
1343         ret2 = ext4_mark_inode_dirty(handle, dir);
1344         if (unlikely(ret2 && !ret))
1345                 ret = ret2;
1346         brelse(iloc.bh);
1347         return ret;
1348 }
1349
1350 /*
1351  * This function fills a red-black tree with information from an
1352  * inlined dir.  It returns the number directory entries loaded
1353  * into the tree.  If there is an error it is returned in err.
1354  */
1355 int ext4_inlinedir_to_tree(struct file *dir_file,
1356                            struct inode *dir, ext4_lblk_t block,
1357                            struct dx_hash_info *hinfo,
1358                            __u32 start_hash, __u32 start_minor_hash,
1359                            int *has_inline_data)
1360 {
1361         int err = 0, count = 0;
1362         unsigned int parent_ino;
1363         int pos;
1364         struct ext4_dir_entry_2 *de;
1365         struct inode *inode = file_inode(dir_file);
1366         int ret, inline_size = 0;
1367         struct ext4_iloc iloc;
1368         void *dir_buf = NULL;
1369         struct ext4_dir_entry_2 fake;
1370         struct fscrypt_str tmp_str;
1371
1372         ret = ext4_get_inode_loc(inode, &iloc);
1373         if (ret)
1374                 return ret;
1375
1376         down_read(&EXT4_I(inode)->xattr_sem);
1377         if (!ext4_has_inline_data(inode)) {
1378                 up_read(&EXT4_I(inode)->xattr_sem);
1379                 *has_inline_data = 0;
1380                 goto out;
1381         }
1382
1383         inline_size = ext4_get_inline_size(inode);
1384         dir_buf = kmalloc(inline_size, GFP_NOFS);
1385         if (!dir_buf) {
1386                 ret = -ENOMEM;
1387                 up_read(&EXT4_I(inode)->xattr_sem);
1388                 goto out;
1389         }
1390
1391         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1392         up_read(&EXT4_I(inode)->xattr_sem);
1393         if (ret < 0)
1394                 goto out;
1395
1396         pos = 0;
1397         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1398         while (pos < inline_size) {
1399                 /*
1400                  * As inlined dir doesn't store any information about '.' and
1401                  * only the inode number of '..' is stored, we have to handle
1402                  * them differently.
1403                  */
1404                 if (pos == 0) {
1405                         fake.inode = cpu_to_le32(inode->i_ino);
1406                         fake.name_len = 1;
1407                         strcpy(fake.name, ".");
1408                         fake.rec_len = ext4_rec_len_to_disk(
1409                                           ext4_dir_rec_len(fake.name_len, NULL),
1410                                           inline_size);
1411                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1412                         de = &fake;
1413                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1414                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1415                         fake.inode = cpu_to_le32(parent_ino);
1416                         fake.name_len = 2;
1417                         strcpy(fake.name, "..");
1418                         fake.rec_len = ext4_rec_len_to_disk(
1419                                           ext4_dir_rec_len(fake.name_len, NULL),
1420                                           inline_size);
1421                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1422                         de = &fake;
1423                         pos = EXT4_INLINE_DOTDOT_SIZE;
1424                 } else {
1425                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1426                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1427                         if (ext4_check_dir_entry(inode, dir_file, de,
1428                                          iloc.bh, dir_buf,
1429                                          inline_size, pos)) {
1430                                 ret = count;
1431                                 goto out;
1432                         }
1433                 }
1434
1435                 if (ext4_hash_in_dirent(dir)) {
1436                         hinfo->hash = EXT4_DIRENT_HASH(de);
1437                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1438                 } else {
1439                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1440                 }
1441                 if ((hinfo->hash < start_hash) ||
1442                     ((hinfo->hash == start_hash) &&
1443                      (hinfo->minor_hash < start_minor_hash)))
1444                         continue;
1445                 if (de->inode == 0)
1446                         continue;
1447                 tmp_str.name = de->name;
1448                 tmp_str.len = de->name_len;
1449                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1450                                               hinfo->minor_hash, de, &tmp_str);
1451                 if (err) {
1452                         ret = err;
1453                         goto out;
1454                 }
1455                 count++;
1456         }
1457         ret = count;
1458 out:
1459         kfree(dir_buf);
1460         brelse(iloc.bh);
1461         return ret;
1462 }
1463
1464 /*
1465  * So this function is called when the volume is mkfsed with
1466  * dir_index disabled. In order to keep f_pos persistent
1467  * after we convert from an inlined dir to a blocked based,
1468  * we just pretend that we are a normal dir and return the
1469  * offset as if '.' and '..' really take place.
1470  *
1471  */
1472 int ext4_read_inline_dir(struct file *file,
1473                          struct dir_context *ctx,
1474                          int *has_inline_data)
1475 {
1476         unsigned int offset, parent_ino;
1477         int i;
1478         struct ext4_dir_entry_2 *de;
1479         struct super_block *sb;
1480         struct inode *inode = file_inode(file);
1481         int ret, inline_size = 0;
1482         struct ext4_iloc iloc;
1483         void *dir_buf = NULL;
1484         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1485
1486         ret = ext4_get_inode_loc(inode, &iloc);
1487         if (ret)
1488                 return ret;
1489
1490         down_read(&EXT4_I(inode)->xattr_sem);
1491         if (!ext4_has_inline_data(inode)) {
1492                 up_read(&EXT4_I(inode)->xattr_sem);
1493                 *has_inline_data = 0;
1494                 goto out;
1495         }
1496
1497         inline_size = ext4_get_inline_size(inode);
1498         dir_buf = kmalloc(inline_size, GFP_NOFS);
1499         if (!dir_buf) {
1500                 ret = -ENOMEM;
1501                 up_read(&EXT4_I(inode)->xattr_sem);
1502                 goto out;
1503         }
1504
1505         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1506         up_read(&EXT4_I(inode)->xattr_sem);
1507         if (ret < 0)
1508                 goto out;
1509
1510         ret = 0;
1511         sb = inode->i_sb;
1512         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1513         offset = ctx->pos;
1514
1515         /*
1516          * dotdot_offset and dotdot_size is the real offset and
1517          * size for ".." and "." if the dir is block based while
1518          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1519          * So we will use extra_offset and extra_size to indicate them
1520          * during the inline dir iteration.
1521          */
1522         dotdot_offset = ext4_dir_rec_len(1, NULL);
1523         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1524         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1525         extra_size = extra_offset + inline_size;
1526
1527         /*
1528          * If the version has changed since the last call to
1529          * readdir(2), then we might be pointing to an invalid
1530          * dirent right now.  Scan from the start of the inline
1531          * dir to make sure.
1532          */
1533         if (!inode_eq_iversion(inode, file->f_version)) {
1534                 for (i = 0; i < extra_size && i < offset;) {
1535                         /*
1536                          * "." is with offset 0 and
1537                          * ".." is dotdot_offset.
1538                          */
1539                         if (!i) {
1540                                 i = dotdot_offset;
1541                                 continue;
1542                         } else if (i == dotdot_offset) {
1543                                 i = dotdot_size;
1544                                 continue;
1545                         }
1546                         /* for other entry, the real offset in
1547                          * the buf has to be tuned accordingly.
1548                          */
1549                         de = (struct ext4_dir_entry_2 *)
1550                                 (dir_buf + i - extra_offset);
1551                         /* It's too expensive to do a full
1552                          * dirent test each time round this
1553                          * loop, but we do have to test at
1554                          * least that it is non-zero.  A
1555                          * failure will be detected in the
1556                          * dirent test below. */
1557                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1558                                 < ext4_dir_rec_len(1, NULL))
1559                                 break;
1560                         i += ext4_rec_len_from_disk(de->rec_len,
1561                                                     extra_size);
1562                 }
1563                 offset = i;
1564                 ctx->pos = offset;
1565                 file->f_version = inode_query_iversion(inode);
1566         }
1567
1568         while (ctx->pos < extra_size) {
1569                 if (ctx->pos == 0) {
1570                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1571                                 goto out;
1572                         ctx->pos = dotdot_offset;
1573                         continue;
1574                 }
1575
1576                 if (ctx->pos == dotdot_offset) {
1577                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1578                                 goto out;
1579                         ctx->pos = dotdot_size;
1580                         continue;
1581                 }
1582
1583                 de = (struct ext4_dir_entry_2 *)
1584                         (dir_buf + ctx->pos - extra_offset);
1585                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1586                                          extra_size, ctx->pos))
1587                         goto out;
1588                 if (le32_to_cpu(de->inode)) {
1589                         if (!dir_emit(ctx, de->name, de->name_len,
1590                                       le32_to_cpu(de->inode),
1591                                       get_dtype(sb, de->file_type)))
1592                                 goto out;
1593                 }
1594                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1595         }
1596 out:
1597         kfree(dir_buf);
1598         brelse(iloc.bh);
1599         return ret;
1600 }
1601
1602 void *ext4_read_inline_link(struct inode *inode)
1603 {
1604         struct ext4_iloc iloc;
1605         int ret, inline_size;
1606         void *link;
1607
1608         ret = ext4_get_inode_loc(inode, &iloc);
1609         if (ret)
1610                 return ERR_PTR(ret);
1611
1612         ret = -ENOMEM;
1613         inline_size = ext4_get_inline_size(inode);
1614         link = kmalloc(inline_size + 1, GFP_NOFS);
1615         if (!link)
1616                 goto out;
1617
1618         ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1619         if (ret < 0) {
1620                 kfree(link);
1621                 goto out;
1622         }
1623         nd_terminate_link(link, inode->i_size, ret);
1624 out:
1625         if (ret < 0)
1626                 link = ERR_PTR(ret);
1627         brelse(iloc.bh);
1628         return link;
1629 }
1630
1631 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1632                                         struct ext4_dir_entry_2 **parent_de,
1633                                         int *retval)
1634 {
1635         struct ext4_iloc iloc;
1636
1637         *retval = ext4_get_inode_loc(inode, &iloc);
1638         if (*retval)
1639                 return NULL;
1640
1641         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1642
1643         return iloc.bh;
1644 }
1645
1646 /*
1647  * Try to create the inline data for the new dir.
1648  * If it succeeds, return 0, otherwise return the error.
1649  * In case of ENOSPC, the caller should create the normal disk layout dir.
1650  */
1651 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1652                                struct inode *inode)
1653 {
1654         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1655         struct ext4_iloc iloc;
1656         struct ext4_dir_entry_2 *de;
1657
1658         ret = ext4_get_inode_loc(inode, &iloc);
1659         if (ret)
1660                 return ret;
1661
1662         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1663         if (ret)
1664                 goto out;
1665
1666         /*
1667          * For inline dir, we only save the inode information for the ".."
1668          * and create a fake dentry to cover the left space.
1669          */
1670         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1671         de->inode = cpu_to_le32(parent->i_ino);
1672         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1673         de->inode = 0;
1674         de->rec_len = ext4_rec_len_to_disk(
1675                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1676                                 inline_size);
1677         set_nlink(inode, 2);
1678         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1679 out:
1680         brelse(iloc.bh);
1681         return ret;
1682 }
1683
1684 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1685                                         struct ext4_filename *fname,
1686                                         struct ext4_dir_entry_2 **res_dir,
1687                                         int *has_inline_data)
1688 {
1689         int ret;
1690         struct ext4_iloc iloc;
1691         void *inline_start;
1692         int inline_size;
1693
1694         if (ext4_get_inode_loc(dir, &iloc))
1695                 return NULL;
1696
1697         down_read(&EXT4_I(dir)->xattr_sem);
1698         if (!ext4_has_inline_data(dir)) {
1699                 *has_inline_data = 0;
1700                 goto out;
1701         }
1702
1703         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1704                                                 EXT4_INLINE_DOTDOT_SIZE;
1705         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1706         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1707                               dir, fname, 0, res_dir);
1708         if (ret == 1)
1709                 goto out_find;
1710         if (ret < 0)
1711                 goto out;
1712
1713         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1714                 goto out;
1715
1716         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1717         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1718
1719         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1720                               dir, fname, 0, res_dir);
1721         if (ret == 1)
1722                 goto out_find;
1723
1724 out:
1725         brelse(iloc.bh);
1726         iloc.bh = NULL;
1727 out_find:
1728         up_read(&EXT4_I(dir)->xattr_sem);
1729         return iloc.bh;
1730 }
1731
1732 int ext4_delete_inline_entry(handle_t *handle,
1733                              struct inode *dir,
1734                              struct ext4_dir_entry_2 *de_del,
1735                              struct buffer_head *bh,
1736                              int *has_inline_data)
1737 {
1738         int err, inline_size, no_expand;
1739         struct ext4_iloc iloc;
1740         void *inline_start;
1741
1742         err = ext4_get_inode_loc(dir, &iloc);
1743         if (err)
1744                 return err;
1745
1746         ext4_write_lock_xattr(dir, &no_expand);
1747         if (!ext4_has_inline_data(dir)) {
1748                 *has_inline_data = 0;
1749                 goto out;
1750         }
1751
1752         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1753                 EXT4_MIN_INLINE_DATA_SIZE) {
1754                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1755                                         EXT4_INLINE_DOTDOT_SIZE;
1756                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1757                                 EXT4_INLINE_DOTDOT_SIZE;
1758         } else {
1759                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1760                 inline_size = ext4_get_inline_size(dir) -
1761                                 EXT4_MIN_INLINE_DATA_SIZE;
1762         }
1763
1764         BUFFER_TRACE(bh, "get_write_access");
1765         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1766                                             EXT4_JTR_NONE);
1767         if (err)
1768                 goto out;
1769
1770         err = ext4_generic_delete_entry(dir, de_del, bh,
1771                                         inline_start, inline_size, 0);
1772         if (err)
1773                 goto out;
1774
1775         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1776 out:
1777         ext4_write_unlock_xattr(dir, &no_expand);
1778         if (likely(err == 0))
1779                 err = ext4_mark_inode_dirty(handle, dir);
1780         brelse(iloc.bh);
1781         if (err != -ENOENT)
1782                 ext4_std_error(dir->i_sb, err);
1783         return err;
1784 }
1785
1786 /*
1787  * Get the inline dentry at offset.
1788  */
1789 static inline struct ext4_dir_entry_2 *
1790 ext4_get_inline_entry(struct inode *inode,
1791                       struct ext4_iloc *iloc,
1792                       unsigned int offset,
1793                       void **inline_start,
1794                       int *inline_size)
1795 {
1796         void *inline_pos;
1797
1798         BUG_ON(offset > ext4_get_inline_size(inode));
1799
1800         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1801                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1802                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1803         } else {
1804                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1805                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1806                 *inline_size = ext4_get_inline_size(inode) -
1807                                 EXT4_MIN_INLINE_DATA_SIZE;
1808         }
1809
1810         if (inline_start)
1811                 *inline_start = inline_pos;
1812         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1813 }
1814
1815 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1816 {
1817         int err, inline_size;
1818         struct ext4_iloc iloc;
1819         size_t inline_len;
1820         void *inline_pos;
1821         unsigned int offset;
1822         struct ext4_dir_entry_2 *de;
1823         bool ret = false;
1824
1825         err = ext4_get_inode_loc(dir, &iloc);
1826         if (err) {
1827                 EXT4_ERROR_INODE_ERR(dir, -err,
1828                                      "error %d getting inode %lu block",
1829                                      err, dir->i_ino);
1830                 return false;
1831         }
1832
1833         down_read(&EXT4_I(dir)->xattr_sem);
1834         if (!ext4_has_inline_data(dir)) {
1835                 *has_inline_data = 0;
1836                 ret = true;
1837                 goto out;
1838         }
1839
1840         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1841         if (!le32_to_cpu(de->inode)) {
1842                 ext4_warning(dir->i_sb,
1843                              "bad inline directory (dir #%lu) - no `..'",
1844                              dir->i_ino);
1845                 goto out;
1846         }
1847
1848         inline_len = ext4_get_inline_size(dir);
1849         offset = EXT4_INLINE_DOTDOT_SIZE;
1850         while (offset < inline_len) {
1851                 de = ext4_get_inline_entry(dir, &iloc, offset,
1852                                            &inline_pos, &inline_size);
1853                 if (ext4_check_dir_entry(dir, NULL, de,
1854                                          iloc.bh, inline_pos,
1855                                          inline_size, offset)) {
1856                         ext4_warning(dir->i_sb,
1857                                      "bad inline directory (dir #%lu) - "
1858                                      "inode %u, rec_len %u, name_len %d"
1859                                      "inline size %d",
1860                                      dir->i_ino, le32_to_cpu(de->inode),
1861                                      le16_to_cpu(de->rec_len), de->name_len,
1862                                      inline_size);
1863                         goto out;
1864                 }
1865                 if (le32_to_cpu(de->inode)) {
1866                         goto out;
1867                 }
1868                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1869         }
1870
1871         ret = true;
1872 out:
1873         up_read(&EXT4_I(dir)->xattr_sem);
1874         brelse(iloc.bh);
1875         return ret;
1876 }
1877
1878 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1879 {
1880         int ret, no_expand;
1881
1882         ext4_write_lock_xattr(inode, &no_expand);
1883         ret = ext4_destroy_inline_data_nolock(handle, inode);
1884         ext4_write_unlock_xattr(inode, &no_expand);
1885
1886         return ret;
1887 }
1888
1889 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1890 {
1891         __u64 addr;
1892         int error = -EAGAIN;
1893         struct ext4_iloc iloc;
1894
1895         down_read(&EXT4_I(inode)->xattr_sem);
1896         if (!ext4_has_inline_data(inode))
1897                 goto out;
1898
1899         error = ext4_get_inode_loc(inode, &iloc);
1900         if (error)
1901                 goto out;
1902
1903         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1904         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1905         addr += offsetof(struct ext4_inode, i_block);
1906
1907         brelse(iloc.bh);
1908
1909         iomap->addr = addr;
1910         iomap->offset = 0;
1911         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1912                               i_size_read(inode));
1913         iomap->type = IOMAP_INLINE;
1914         iomap->flags = 0;
1915
1916 out:
1917         up_read(&EXT4_I(inode)->xattr_sem);
1918         return error;
1919 }
1920
1921 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1922 {
1923         handle_t *handle;
1924         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1925         size_t i_size;
1926         void *value = NULL;
1927         struct ext4_xattr_ibody_find is = {
1928                 .s = { .not_found = -ENODATA, },
1929         };
1930         struct ext4_xattr_info i = {
1931                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1932                 .name = EXT4_XATTR_SYSTEM_DATA,
1933         };
1934
1935
1936         needed_blocks = ext4_writepage_trans_blocks(inode);
1937         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1938         if (IS_ERR(handle))
1939                 return PTR_ERR(handle);
1940
1941         ext4_write_lock_xattr(inode, &no_expand);
1942         if (!ext4_has_inline_data(inode)) {
1943                 ext4_write_unlock_xattr(inode, &no_expand);
1944                 *has_inline = 0;
1945                 ext4_journal_stop(handle);
1946                 return 0;
1947         }
1948
1949         if ((err = ext4_orphan_add(handle, inode)) != 0)
1950                 goto out;
1951
1952         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1953                 goto out;
1954
1955         down_write(&EXT4_I(inode)->i_data_sem);
1956         i_size = inode->i_size;
1957         inline_size = ext4_get_inline_size(inode);
1958         EXT4_I(inode)->i_disksize = i_size;
1959
1960         if (i_size < inline_size) {
1961                 /*
1962                  * if there's inline data to truncate and this file was
1963                  * converted to extents after that inline data was written,
1964                  * the extent status cache must be cleared to avoid leaving
1965                  * behind stale delayed allocated extent entries
1966                  */
1967                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1968 retry:
1969                         err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1970                         if (err == -ENOMEM) {
1971                                 memalloc_retry_wait(GFP_ATOMIC);
1972                                 goto retry;
1973                         }
1974                         if (err)
1975                                 goto out_error;
1976                 }
1977
1978                 /* Clear the content in the xattr space. */
1979                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1980                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1981                                 goto out_error;
1982
1983                         BUG_ON(is.s.not_found);
1984
1985                         value_len = le32_to_cpu(is.s.here->e_value_size);
1986                         value = kmalloc(value_len, GFP_NOFS);
1987                         if (!value) {
1988                                 err = -ENOMEM;
1989                                 goto out_error;
1990                         }
1991
1992                         err = ext4_xattr_ibody_get(inode, i.name_index,
1993                                                    i.name, value, value_len);
1994                         if (err <= 0)
1995                                 goto out_error;
1996
1997                         i.value = value;
1998                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1999                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
2000                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
2001                         if (err)
2002                                 goto out_error;
2003                 }
2004
2005                 /* Clear the content within i_blocks. */
2006                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
2007                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2008                         memset(p + i_size, 0,
2009                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
2010                 }
2011
2012                 EXT4_I(inode)->i_inline_size = i_size <
2013                                         EXT4_MIN_INLINE_DATA_SIZE ?
2014                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2015         }
2016
2017 out_error:
2018         up_write(&EXT4_I(inode)->i_data_sem);
2019 out:
2020         brelse(is.iloc.bh);
2021         ext4_write_unlock_xattr(inode, &no_expand);
2022         kfree(value);
2023         if (inode->i_nlink)
2024                 ext4_orphan_del(handle, inode);
2025
2026         if (err == 0) {
2027                 inode->i_mtime = inode->i_ctime = current_time(inode);
2028                 err = ext4_mark_inode_dirty(handle, inode);
2029                 if (IS_SYNC(inode))
2030                         ext4_handle_sync(handle);
2031         }
2032         ext4_journal_stop(handle);
2033         return err;
2034 }
2035
2036 int ext4_convert_inline_data(struct inode *inode)
2037 {
2038         int error, needed_blocks, no_expand;
2039         handle_t *handle;
2040         struct ext4_iloc iloc;
2041
2042         if (!ext4_has_inline_data(inode)) {
2043                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2044                 return 0;
2045         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2046                 /*
2047                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2048                  * cleared. This means we are in the middle of moving of
2049                  * inline data to delay allocated block. Just force writeout
2050                  * here to finish conversion.
2051                  */
2052                 error = filemap_flush(inode->i_mapping);
2053                 if (error)
2054                         return error;
2055                 if (!ext4_has_inline_data(inode))
2056                         return 0;
2057         }
2058
2059         needed_blocks = ext4_writepage_trans_blocks(inode);
2060
2061         iloc.bh = NULL;
2062         error = ext4_get_inode_loc(inode, &iloc);
2063         if (error)
2064                 return error;
2065
2066         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2067         if (IS_ERR(handle)) {
2068                 error = PTR_ERR(handle);
2069                 goto out_free;
2070         }
2071
2072         ext4_write_lock_xattr(inode, &no_expand);
2073         if (ext4_has_inline_data(inode))
2074                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2075         ext4_write_unlock_xattr(inode, &no_expand);
2076         ext4_journal_stop(handle);
2077 out_free:
2078         brelse(iloc.bh);
2079         return error;
2080 }