fs/ext4/inline.c

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