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
  11 #include "ext4_jbd2.h"
  12 #include "ext4.h"
  13 #include "xattr.h"
  14 #include "truncate.h"
  15
  16 #define EXT4_XATTR_SYSTEM_DATA  "data"
  17 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  18 #define EXT4_INLINE_DOTDOT_OFFSET       2
  19 #define EXT4_INLINE_DOTDOT_SIZE         4
  20
  21 static int ext4_get_inline_size(struct inode *inode)
  22 {
  23         if (EXT4_I(inode)->i_inline_off)
  24                 return EXT4_I(inode)->i_inline_size;
  25
  26         return 0;
  27 }
  28
  29 static int get_max_inline_xattr_value_size(struct inode *inode,
  30                                            struct ext4_iloc *iloc)
  31 {
  32         struct ext4_xattr_ibody_header *header;
  33         struct ext4_xattr_entry *entry;
  34         struct ext4_inode *raw_inode;
  35         void *end;
  36         int free, min_offs;
  37
  38         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  39                 return 0;
  40
  41         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  42                         EXT4_GOOD_OLD_INODE_SIZE -
  43                         EXT4_I(inode)->i_extra_isize -
  44                         sizeof(struct ext4_xattr_ibody_header);
  45
  46         /*
  47          * We need to subtract another sizeof(__u32) since an in-inode xattr
  48          * needs an empty 4 bytes to indicate the gap between the xattr entry
  49          * and the name/value pair.
  50          */
  51         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  52                 return EXT4_XATTR_SIZE(min_offs -
  53                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  54                         EXT4_XATTR_ROUND - sizeof(__u32));
  55
  56         raw_inode = ext4_raw_inode(iloc);
  57         header = IHDR(inode, raw_inode);
  58         entry = IFIRST(header);
  59         end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  60
  61         /* Compute min_offs. */
  62         while (!IS_LAST_ENTRY(entry)) {
  63                 void *next = EXT4_XATTR_NEXT(entry);
  64
  65                 if (next >= end) {
  66                         EXT4_ERROR_INODE(inode,
  67                                          "corrupt xattr in inline inode");
  68                         return 0;
  69                 }
  70                 if (!entry->e_value_inum && entry->e_value_size) {
  71                         size_t offs = le16_to_cpu(entry->e_value_offs);
  72                         if (offs < min_offs)
  73                                 min_offs = offs;
  74                 }
  75                 entry = next;
  76         }
  77         free = min_offs -
  78                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  79
  80         if (EXT4_I(inode)->i_inline_off) {
  81                 entry = (struct ext4_xattr_entry *)
  82                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  83
  84                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  85                 goto out;
  86         }
  87
  88         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  89
  90         if (free > EXT4_XATTR_ROUND)
  91                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  92         else
  93                 free = 0;
  94
  95 out:
  96         return free;
  97 }
  98
  99 /*
 100  * Get the maximum size we now can store in an inode.
 101  * If we can't find the space for a xattr entry, don't use the space
 102  * of the extents since we have no space to indicate the inline data.
 103  */
 104 int ext4_get_max_inline_size(struct inode *inode)
 105 {
 106         int error, max_inline_size;
 107         struct ext4_iloc iloc;
 108
 109         if (EXT4_I(inode)->i_extra_isize == 0)
 110                 return 0;
 111
 112         error = ext4_get_inode_loc(inode, &iloc);
 113         if (error) {
 114                 ext4_error_inode(inode, __func__, __LINE__, 0,
 115                                  "can't get inode location %lu",
 116                                  inode->i_ino);
 117                 return 0;
 118         }
 119
 120         down_read(&EXT4_I(inode)->xattr_sem);
 121         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 122         up_read(&EXT4_I(inode)->xattr_sem);
 123
 124         brelse(iloc.bh);
 125
 126         if (!max_inline_size)
 127                 return 0;
 128
 129         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 130 }
 131
 132 /*
 133  * this function does not take xattr_sem, which is OK because it is
 134  * currently only used in a code path coming form ext4_iget, before
 135  * the new inode has been unlocked
 136  */
 137 int ext4_find_inline_data_nolock(struct inode *inode)
 138 {
 139         struct ext4_xattr_ibody_find is = {
 140                 .s = { .not_found = -ENODATA, },
 141         };
 142         struct ext4_xattr_info i = {
 143                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 144                 .name = EXT4_XATTR_SYSTEM_DATA,
 145         };
 146         int error;
 147
 148         if (EXT4_I(inode)->i_extra_isize == 0)
 149                 return 0;
 150
 151         error = ext4_get_inode_loc(inode, &is.iloc);
 152         if (error)
 153                 return error;
 154
 155         error = ext4_xattr_ibody_find(inode, &i, &is);
 156         if (error)
 157                 goto out;
 158
 159         if (!is.s.not_found) {
 160                 if (is.s.here->e_value_inum) {
 161                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 162                                          "to an external xattr inode");
 163                         error = -EFSCORRUPTED;
 164                         goto out;
 165                 }
 166                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 167                                         (void *)ext4_raw_inode(&is.iloc));
 168                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 169                                 le32_to_cpu(is.s.here->e_value_size);
 170         }
 171 out:
 172         brelse(is.iloc.bh);
 173         return error;
 174 }
 175
 176 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 177                                  unsigned int len,
 178                                  struct ext4_iloc *iloc)
 179 {
 180         struct ext4_xattr_entry *entry;
 181         struct ext4_xattr_ibody_header *header;
 182         int cp_len = 0;
 183         struct ext4_inode *raw_inode;
 184
 185         if (!len)
 186                 return 0;
 187
 188         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 189
 190         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 191                         len : EXT4_MIN_INLINE_DATA_SIZE;
 192
 193         raw_inode = ext4_raw_inode(iloc);
 194         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 195
 196         len -= cp_len;
 197         buffer += cp_len;
 198
 199         if (!len)
 200                 goto out;
 201
 202         header = IHDR(inode, raw_inode);
 203         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 204                                             EXT4_I(inode)->i_inline_off);
 205         len = min_t(unsigned int, len,
 206                     (unsigned int)le32_to_cpu(entry->e_value_size));
 207
 208         memcpy(buffer,
 209                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 210         cp_len += len;
 211
 212 out:
 213         return cp_len;
 214 }
 215
 216 /*
 217  * write the buffer to the inline inode.
 218  * If 'create' is set, we don't need to do the extra copy in the xattr
 219  * value since it is already handled by ext4_xattr_ibody_set.
 220  * That saves us one memcpy.
 221  */
 222 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 223                                    void *buffer, loff_t pos, unsigned int len)
 224 {
 225         struct ext4_xattr_entry *entry;
 226         struct ext4_xattr_ibody_header *header;
 227         struct ext4_inode *raw_inode;
 228         int cp_len = 0;
 229
 230         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 231                 return;
 232
 233         BUG_ON(!EXT4_I(inode)->i_inline_off);
 234         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 235
 236         raw_inode = ext4_raw_inode(iloc);
 237         buffer += pos;
 238
 239         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 240                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 241                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 242                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 243
 244                 len -= cp_len;
 245                 buffer += cp_len;
 246                 pos += cp_len;
 247         }
 248
 249         if (!len)
 250                 return;
 251
 252         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 253         header = IHDR(inode, raw_inode);
 254         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 255                                             EXT4_I(inode)->i_inline_off);
 256
 257         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 258                buffer, len);
 259 }
 260
 261 static int ext4_create_inline_data(handle_t *handle,
 262                                    struct inode *inode, unsigned len)
 263 {
 264         int error;
 265         void *value = NULL;
 266         struct ext4_xattr_ibody_find is = {
 267                 .s = { .not_found = -ENODATA, },
 268         };
 269         struct ext4_xattr_info i = {
 270                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 271                 .name = EXT4_XATTR_SYSTEM_DATA,
 272         };
 273
 274         error = ext4_get_inode_loc(inode, &is.iloc);
 275         if (error)
 276                 return error;
 277
 278         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 279         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 280         if (error)
 281                 goto out;
 282
 283         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 284                 value = EXT4_ZERO_XATTR_VALUE;
 285                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 286         } else {
 287                 value = "";
 288                 len = 0;
 289         }
 290
 291         /* Insert the the xttr entry. */
 292         i.value = value;
 293         i.value_len = len;
 294
 295         error = ext4_xattr_ibody_find(inode, &i, &is);
 296         if (error)
 297                 goto out;
 298
 299         BUG_ON(!is.s.not_found);
 300
 301         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 302         if (error) {
 303                 if (error == -ENOSPC)
 304                         ext4_clear_inode_state(inode,
 305                                                EXT4_STATE_MAY_INLINE_DATA);
 306                 goto out;
 307         }
 308
 309         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 310                 0, EXT4_MIN_INLINE_DATA_SIZE);
 311
 312         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 313                                       (void *)ext4_raw_inode(&is.iloc));
 314         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 315         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 316         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 317         get_bh(is.iloc.bh);
 318         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 319
 320 out:
 321         brelse(is.iloc.bh);
 322         return error;
 323 }
 324
 325 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 326                                    unsigned int len)
 327 {
 328         int error;
 329         void *value = NULL;
 330         struct ext4_xattr_ibody_find is = {
 331                 .s = { .not_found = -ENODATA, },
 332         };
 333         struct ext4_xattr_info i = {
 334                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 335                 .name = EXT4_XATTR_SYSTEM_DATA,
 336         };
 337
 338         /* If the old space is ok, write the data directly. */
 339         if (len <= EXT4_I(inode)->i_inline_size)
 340                 return 0;
 341
 342         error = ext4_get_inode_loc(inode, &is.iloc);
 343         if (error)
 344                 return error;
 345
 346         error = ext4_xattr_ibody_find(inode, &i, &is);
 347         if (error)
 348                 goto out;
 349
 350         BUG_ON(is.s.not_found);
 351
 352         len -= EXT4_MIN_INLINE_DATA_SIZE;
 353         value = kzalloc(len, GFP_NOFS);
 354         if (!value) {
 355                 error = -ENOMEM;
 356                 goto out;
 357         }
 358
 359         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 360                                      value, len);
 361         if (error < 0)
 362                 goto out;
 363
 364         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 365         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 366         if (error)
 367                 goto out;
 368
 369         /* Update the xttr entry. */
 370         i.value = value;
 371         i.value_len = len;
 372
 373         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 374         if (error)
 375                 goto out;
 376
 377         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 378                                       (void *)ext4_raw_inode(&is.iloc));
 379         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 380                                 le32_to_cpu(is.s.here->e_value_size);
 381         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 382         get_bh(is.iloc.bh);
 383         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 384
 385 out:
 386         kfree(value);
 387         brelse(is.iloc.bh);
 388         return error;
 389 }
 390
 391 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 392                                     unsigned int len)
 393 {
 394         int ret, size, no_expand;
 395         struct ext4_inode_info *ei = EXT4_I(inode);
 396
 397         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 398                 return -ENOSPC;
 399
 400         size = ext4_get_max_inline_size(inode);
 401         if (size < len)
 402                 return -ENOSPC;
 403
 404         ext4_write_lock_xattr(inode, &no_expand);
 405
 406         if (ei->i_inline_off)
 407                 ret = ext4_update_inline_data(handle, inode, len);
 408         else
 409                 ret = ext4_create_inline_data(handle, inode, len);
 410
 411         ext4_write_unlock_xattr(inode, &no_expand);
 412         return ret;
 413 }
 414
 415 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 416                                            struct inode *inode)
 417 {
 418         struct ext4_inode_info *ei = EXT4_I(inode);
 419         struct ext4_xattr_ibody_find is = {
 420                 .s = { .not_found = 0, },
 421         };
 422         struct ext4_xattr_info i = {
 423                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 424                 .name = EXT4_XATTR_SYSTEM_DATA,
 425                 .value = NULL,
 426                 .value_len = 0,
 427         };
 428         int error;
 429
 430         if (!ei->i_inline_off)
 431                 return 0;
 432
 433         error = ext4_get_inode_loc(inode, &is.iloc);
 434         if (error)
 435                 return error;
 436
 437         error = ext4_xattr_ibody_find(inode, &i, &is);
 438         if (error)
 439                 goto out;
 440
 441         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 442         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 443         if (error)
 444                 goto out;
 445
 446         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 447         if (error)
 448                 goto out;
 449
 450         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 451                 0, EXT4_MIN_INLINE_DATA_SIZE);
 452         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 453
 454         if (ext4_has_feature_extents(inode->i_sb)) {
 455                 if (S_ISDIR(inode->i_mode) ||
 456                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 457                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 458                         ext4_ext_tree_init(handle, inode);
 459                 }
 460         }
 461         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 462
 463         get_bh(is.iloc.bh);
 464         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 465
 466         EXT4_I(inode)->i_inline_off = 0;
 467         EXT4_I(inode)->i_inline_size = 0;
 468         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 469 out:
 470         brelse(is.iloc.bh);
 471         if (error == -ENODATA)
 472                 error = 0;
 473         return error;
 474 }
 475
 476 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 477 {
 478         void *kaddr;
 479         int ret = 0;
 480         size_t len;
 481         struct ext4_iloc iloc;
 482
 483         BUG_ON(!PageLocked(page));
 484         BUG_ON(!ext4_has_inline_data(inode));
 485         BUG_ON(page->index);
 486
 487         if (!EXT4_I(inode)->i_inline_off) {
 488                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 489                              inode->i_ino);
 490                 goto out;
 491         }
 492
 493         ret = ext4_get_inode_loc(inode, &iloc);
 494         if (ret)
 495                 goto out;
 496
 497         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 498         kaddr = kmap_atomic(page);
 499         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 500         flush_dcache_page(page);
 501         kunmap_atomic(kaddr);
 502         zero_user_segment(page, len, PAGE_SIZE);
 503         SetPageUptodate(page);
 504         brelse(iloc.bh);
 505
 506 out:
 507         return ret;
 508 }
 509
 510 int ext4_readpage_inline(struct inode *inode, struct page *page)
 511 {
 512         int ret = 0;
 513
 514         down_read(&EXT4_I(inode)->xattr_sem);
 515         if (!ext4_has_inline_data(inode)) {
 516                 up_read(&EXT4_I(inode)->xattr_sem);
 517                 return -EAGAIN;
 518         }
 519
 520         /*
 521          * Current inline data can only exist in the 1st page,
 522          * So for all the other pages, just set them uptodate.
 523          */
 524         if (!page->index)
 525                 ret = ext4_read_inline_page(inode, page);
 526         else if (!PageUptodate(page)) {
 527                 zero_user_segment(page, 0, PAGE_SIZE);
 528                 SetPageUptodate(page);
 529         }
 530
 531         up_read(&EXT4_I(inode)->xattr_sem);
 532
 533         unlock_page(page);
 534         return ret >= 0 ? 0 : ret;
 535 }
 536
 537 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 538                                               struct inode *inode,
 539                                               unsigned flags)
 540 {
 541         int ret, needed_blocks, no_expand;
 542         handle_t *handle = NULL;
 543         int retries = 0, sem_held = 0;
 544         struct page *page = NULL;
 545         unsigned from, to;
 546         struct ext4_iloc iloc;
 547
 548         if (!ext4_has_inline_data(inode)) {
 549                 /*
 550                  * clear the flag so that no new write
 551                  * will trap here again.
 552                  */
 553                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 554                 return 0;
 555         }
 556
 557         needed_blocks = ext4_writepage_trans_blocks(inode);
 558
 559         ret = ext4_get_inode_loc(inode, &iloc);
 560         if (ret)
 561                 return ret;
 562
 563 retry:
 564         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 565         if (IS_ERR(handle)) {
 566                 ret = PTR_ERR(handle);
 567                 handle = NULL;
 568                 goto out;
 569         }
 570
 571         /* We cannot recurse into the filesystem as the transaction is already
 572          * started */
 573         flags |= AOP_FLAG_NOFS;
 574
 575         page = grab_cache_page_write_begin(mapping, 0, flags);
 576         if (!page) {
 577                 ret = -ENOMEM;
 578                 goto out;
 579         }
 580
 581         ext4_write_lock_xattr(inode, &no_expand);
 582         sem_held = 1;
 583         /* If some one has already done this for us, just exit. */
 584         if (!ext4_has_inline_data(inode)) {
 585                 ret = 0;
 586                 goto out;
 587         }
 588
 589         from = 0;
 590         to = ext4_get_inline_size(inode);
 591         if (!PageUptodate(page)) {
 592                 ret = ext4_read_inline_page(inode, page);
 593                 if (ret < 0)
 594                         goto out;
 595         }
 596
 597         ret = ext4_destroy_inline_data_nolock(handle, inode);
 598         if (ret)
 599                 goto out;
 600
 601         if (ext4_should_dioread_nolock(inode)) {
 602                 ret = __block_write_begin(page, from, to,
 603                                           ext4_get_block_unwritten);
 604         } else
 605                 ret = __block_write_begin(page, from, to, ext4_get_block);
 606
 607         if (!ret && ext4_should_journal_data(inode)) {
 608                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 609                                              from, to, NULL,
 610                                              do_journal_get_write_access);
 611         }
 612
 613         if (ret) {
 614                 unlock_page(page);
 615                 put_page(page);
 616                 page = NULL;
 617                 ext4_orphan_add(handle, inode);
 618                 ext4_write_unlock_xattr(inode, &no_expand);
 619                 sem_held = 0;
 620                 ext4_journal_stop(handle);
 621                 handle = NULL;
 622                 ext4_truncate_failed_write(inode);
 623                 /*
 624                  * If truncate failed early the inode might
 625                  * still be on the orphan list; we need to
 626                  * make sure the inode is removed from the
 627                  * orphan list in that case.
 628                  */
 629                 if (inode->i_nlink)
 630                         ext4_orphan_del(NULL, inode);
 631         }
 632
 633         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 634                 goto retry;
 635
 636         if (page)
 637                 block_commit_write(page, from, to);
 638 out:
 639         if (page) {
 640                 unlock_page(page);
 641                 put_page(page);
 642         }
 643         if (sem_held)
 644                 ext4_write_unlock_xattr(inode, &no_expand);
 645         if (handle)
 646                 ext4_journal_stop(handle);
 647         brelse(iloc.bh);
 648         return ret;
 649 }
 650
 651 /*
 652  * Try to write data in the inode.
 653  * If the inode has inline data, check whether the new write can be
 654  * in the inode also. If not, create the page the handle, move the data
 655  * to the page make it update and let the later codes create extent for it.
 656  */
 657 int ext4_try_to_write_inline_data(struct address_space *mapping,
 658                                   struct inode *inode,
 659                                   loff_t pos, unsigned len,
 660                                   unsigned flags,
 661                                   struct page **pagep)
 662 {
 663         int ret;
 664         handle_t *handle;
 665         struct page *page;
 666         struct ext4_iloc iloc;
 667
 668         if (pos + len > ext4_get_max_inline_size(inode))
 669                 goto convert;
 670
 671         ret = ext4_get_inode_loc(inode, &iloc);
 672         if (ret)
 673                 return ret;
 674
 675         /*
 676          * The possible write could happen in the inode,
 677          * so try to reserve the space in inode first.
 678          */
 679         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 680         if (IS_ERR(handle)) {
 681                 ret = PTR_ERR(handle);
 682                 handle = NULL;
 683                 goto out;
 684         }
 685
 686         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 687         if (ret && ret != -ENOSPC)
 688                 goto out;
 689
 690         /* We don't have space in inline inode, so convert it to extent. */
 691         if (ret == -ENOSPC) {
 692                 ext4_journal_stop(handle);
 693                 brelse(iloc.bh);
 694                 goto convert;
 695         }
 696
 697         ret = ext4_journal_get_write_access(handle, iloc.bh);
 698         if (ret)
 699                 goto out;
 700
 701         flags |= AOP_FLAG_NOFS;
 702
 703         page = grab_cache_page_write_begin(mapping, 0, flags);
 704         if (!page) {
 705                 ret = -ENOMEM;
 706                 goto out;
 707         }
 708
 709         *pagep = page;
 710         down_read(&EXT4_I(inode)->xattr_sem);
 711         if (!ext4_has_inline_data(inode)) {
 712                 ret = 0;
 713                 unlock_page(page);
 714                 put_page(page);
 715                 goto out_up_read;
 716         }
 717
 718         if (!PageUptodate(page)) {
 719                 ret = ext4_read_inline_page(inode, page);
 720                 if (ret < 0) {
 721                         unlock_page(page);
 722                         put_page(page);
 723                         goto out_up_read;
 724                 }
 725         }
 726
 727         ret = 1;
 728         handle = NULL;
 729 out_up_read:
 730         up_read(&EXT4_I(inode)->xattr_sem);
 731 out:
 732         if (handle && (ret != 1))
 733                 ext4_journal_stop(handle);
 734         brelse(iloc.bh);
 735         return ret;
 736 convert:
 737         return ext4_convert_inline_data_to_extent(mapping,
 738                                                   inode, flags);
 739 }
 740
 741 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 742                                unsigned copied, struct page *page)
 743 {
 744         int ret, no_expand;
 745         void *kaddr;
 746         struct ext4_iloc iloc;
 747
 748         if (unlikely(copied < len) && !PageUptodate(page))
 749                 return 0;
 750
 751         ret = ext4_get_inode_loc(inode, &iloc);
 752         if (ret) {
 753                 ext4_std_error(inode->i_sb, ret);
 754                 return ret;
 755         }
 756
 757         ext4_write_lock_xattr(inode, &no_expand);
 758         BUG_ON(!ext4_has_inline_data(inode));
 759
 760         /*
 761          * ei->i_inline_off may have changed since ext4_write_begin()
 762          * called ext4_try_to_write_inline_data()
 763          */
 764         (void) ext4_find_inline_data_nolock(inode);
 765
 766         kaddr = kmap_atomic(page);
 767         ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 768         kunmap_atomic(kaddr);
 769         SetPageUptodate(page);
 770         /* clear page dirty so that writepages wouldn't work for us. */
 771         ClearPageDirty(page);
 772
 773         ext4_write_unlock_xattr(inode, &no_expand);
 774         brelse(iloc.bh);
 775         mark_inode_dirty(inode);
 776
 777         return copied;
 778 }
 779
 780 struct buffer_head *
 781 ext4_journalled_write_inline_data(struct inode *inode,
 782                                   unsigned len,
 783                                   struct page *page)
 784 {
 785         int ret, no_expand;
 786         void *kaddr;
 787         struct ext4_iloc iloc;
 788
 789         ret = ext4_get_inode_loc(inode, &iloc);
 790         if (ret) {
 791                 ext4_std_error(inode->i_sb, ret);
 792                 return NULL;
 793         }
 794
 795         ext4_write_lock_xattr(inode, &no_expand);
 796         kaddr = kmap_atomic(page);
 797         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 798         kunmap_atomic(kaddr);
 799         ext4_write_unlock_xattr(inode, &no_expand);
 800
 801         return iloc.bh;
 802 }
 803
 804 /*
 805  * Try to make the page cache and handle ready for the inline data case.
 806  * We can call this function in 2 cases:
 807  * 1. The inode is created and the first write exceeds inline size. We can
 808  *    clear the inode state safely.
 809  * 2. The inode has inline data, then we need to read the data, make it
 810  *    update and dirty so that ext4_da_writepages can handle it. We don't
 811  *    need to start the journal since the file's metatdata isn't changed now.
 812  */
 813 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 814                                                  struct inode *inode,
 815                                                  unsigned flags,
 816                                                  void **fsdata)
 817 {
 818         int ret = 0, inline_size;
 819         struct page *page;
 820
 821         page = grab_cache_page_write_begin(mapping, 0, flags);
 822         if (!page)
 823                 return -ENOMEM;
 824
 825         down_read(&EXT4_I(inode)->xattr_sem);
 826         if (!ext4_has_inline_data(inode)) {
 827                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 828                 goto out;
 829         }
 830
 831         inline_size = ext4_get_inline_size(inode);
 832
 833         if (!PageUptodate(page)) {
 834                 ret = ext4_read_inline_page(inode, page);
 835                 if (ret < 0)
 836                         goto out;
 837         }
 838
 839         ret = __block_write_begin(page, 0, inline_size,
 840                                   ext4_da_get_block_prep);
 841         if (ret) {
 842                 up_read(&EXT4_I(inode)->xattr_sem);
 843                 unlock_page(page);
 844                 put_page(page);
 845                 ext4_truncate_failed_write(inode);
 846                 return ret;
 847         }
 848
 849         SetPageDirty(page);
 850         SetPageUptodate(page);
 851         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 852         *fsdata = (void *)CONVERT_INLINE_DATA;
 853
 854 out:
 855         up_read(&EXT4_I(inode)->xattr_sem);
 856         if (page) {
 857                 unlock_page(page);
 858                 put_page(page);
 859         }
 860         return ret;
 861 }
 862
 863 /*
 864  * Prepare the write for the inline data.
 865  * If the the data can be written into the inode, we just read
 866  * the page and make it uptodate, and start the journal.
 867  * Otherwise read the page, makes it dirty so that it can be
 868  * handle in writepages(the i_disksize update is left to the
 869  * normal ext4_da_write_end).
 870  */
 871 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 872                                     struct inode *inode,
 873                                     loff_t pos, unsigned len,
 874                                     unsigned flags,
 875                                     struct page **pagep,
 876                                     void **fsdata)
 877 {
 878         int ret, inline_size;
 879         handle_t *handle;
 880         struct page *page;
 881         struct ext4_iloc iloc;
 882         int retries = 0;
 883
 884         ret = ext4_get_inode_loc(inode, &iloc);
 885         if (ret)
 886                 return ret;
 887
 888 retry_journal:
 889         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 890         if (IS_ERR(handle)) {
 891                 ret = PTR_ERR(handle);
 892                 goto out;
 893         }
 894
 895         inline_size = ext4_get_max_inline_size(inode);
 896
 897         ret = -ENOSPC;
 898         if (inline_size >= pos + len) {
 899                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 900                 if (ret && ret != -ENOSPC)
 901                         goto out_journal;
 902         }
 903
 904         /*
 905          * We cannot recurse into the filesystem as the transaction
 906          * is already started.
 907          */
 908         flags |= AOP_FLAG_NOFS;
 909
 910         if (ret == -ENOSPC) {
 911                 ext4_journal_stop(handle);
 912                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 913                                                             inode,
 914                                                             flags,
 915                                                             fsdata);
 916                 if (ret == -ENOSPC &&
 917                     ext4_should_retry_alloc(inode->i_sb, &retries))
 918                         goto retry_journal;
 919                 goto out;
 920         }
 921
 922         page = grab_cache_page_write_begin(mapping, 0, flags);
 923         if (!page) {
 924                 ret = -ENOMEM;
 925                 goto out_journal;
 926         }
 927
 928         down_read(&EXT4_I(inode)->xattr_sem);
 929         if (!ext4_has_inline_data(inode)) {
 930                 ret = 0;
 931                 goto out_release_page;
 932         }
 933
 934         if (!PageUptodate(page)) {
 935                 ret = ext4_read_inline_page(inode, page);
 936                 if (ret < 0)
 937                         goto out_release_page;
 938         }
 939         ret = ext4_journal_get_write_access(handle, iloc.bh);
 940         if (ret)
 941                 goto out_release_page;
 942
 943         up_read(&EXT4_I(inode)->xattr_sem);
 944         *pagep = page;
 945         brelse(iloc.bh);
 946         return 1;
 947 out_release_page:
 948         up_read(&EXT4_I(inode)->xattr_sem);
 949         unlock_page(page);
 950         put_page(page);
 951 out_journal:
 952         ext4_journal_stop(handle);
 953 out:
 954         brelse(iloc.bh);
 955         return ret;
 956 }
 957
 958 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 959                                   unsigned len, unsigned copied,
 960                                   struct page *page)
 961 {
 962         int ret;
 963
 964         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 965         if (ret < 0) {
 966                 unlock_page(page);
 967                 put_page(page);
 968                 return ret;
 969         }
 970         copied = ret;
 971
 972         /*
 973          * No need to use i_size_read() here, the i_size
 974          * cannot change under us because we hold i_mutex.
 975          *
 976          * But it's important to update i_size while still holding page lock:
 977          * page writeout could otherwise come in and zero beyond i_size.
 978          */
 979         if (pos+copied > inode->i_size)
 980                 i_size_write(inode, pos+copied);
 981         unlock_page(page);
 982         put_page(page);
 983
 984         /*
 985          * Don't mark the inode dirty under page lock. First, it unnecessarily
 986          * makes the holding time of page lock longer. Second, it forces lock
 987          * ordering of page lock and transaction start for journaling
 988          * filesystems.
 989          */
 990         mark_inode_dirty(inode);
 991
 992         return copied;
 993 }
 994
 995 #ifdef INLINE_DIR_DEBUG
 996 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 997                           void *inline_start, int inline_size)
 998 {
 999         int offset;
1000         unsigned short de_len;
1001         struct ext4_dir_entry_2 *de = inline_start;
1002         void *dlimit = inline_start + inline_size;
1003
1004         trace_printk("inode %lu\n", dir->i_ino);
1005         offset = 0;
1006         while ((void *)de < dlimit) {
1007                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1008                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1009                              offset, de_len, de->name_len, de->name,
1010                              de->name_len, le32_to_cpu(de->inode));
1011                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1012                                          inline_start, inline_size, offset))
1013                         BUG();
1014
1015                 offset += de_len;
1016                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1017         }
1018 }
1019 #else
1020 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1021 #endif
1022
1023 /*
1024  * Add a new entry into a inline dir.
1025  * It will return -ENOSPC if no space is available, and -EIO
1026  * and -EEXIST if directory entry already exists.
1027  */
1028 static int ext4_add_dirent_to_inline(handle_t *handle,
1029                                      struct ext4_filename *fname,
1030                                      struct inode *dir,
1031                                      struct inode *inode,
1032                                      struct ext4_iloc *iloc,
1033                                      void *inline_start, int inline_size)
1034 {
1035         int             err;
1036         struct ext4_dir_entry_2 *de;
1037
1038         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1039                                 inline_size, fname, &de);
1040         if (err)
1041                 return err;
1042
1043         BUFFER_TRACE(iloc->bh, "get_write_access");
1044         err = ext4_journal_get_write_access(handle, iloc->bh);
1045         if (err)
1046                 return err;
1047         ext4_insert_dentry(inode, de, inline_size, fname);
1048
1049         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1050
1051         /*
1052          * XXX shouldn't update any times until successful
1053          * completion of syscall, but too many callers depend
1054          * on this.
1055          *
1056          * XXX similarly, too many callers depend on
1057          * ext4_new_inode() setting the times, but error
1058          * recovery deletes the inode, so the worst that can
1059          * happen is that the times are slightly out of date
1060          * and/or different from the directory change time.
1061          */
1062         dir->i_mtime = dir->i_ctime = current_time(dir);
1063         ext4_update_dx_flag(dir);
1064         inode_inc_iversion(dir);
1065         return 1;
1066 }
1067
1068 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1069                                        struct ext4_iloc *iloc)
1070 {
1071         struct ext4_xattr_entry *entry;
1072         struct ext4_xattr_ibody_header *header;
1073
1074         BUG_ON(!EXT4_I(inode)->i_inline_off);
1075
1076         header = IHDR(inode, ext4_raw_inode(iloc));
1077         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1078                                             EXT4_I(inode)->i_inline_off);
1079
1080         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1081 }
1082
1083 /* Set the final de to cover the whole block. */
1084 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1085 {
1086         struct ext4_dir_entry_2 *de, *prev_de;
1087         void *limit;
1088         int de_len;
1089
1090         de = (struct ext4_dir_entry_2 *)de_buf;
1091         if (old_size) {
1092                 limit = de_buf + old_size;
1093                 do {
1094                         prev_de = de;
1095                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1096                         de_buf += de_len;
1097                         de = (struct ext4_dir_entry_2 *)de_buf;
1098                 } while (de_buf < limit);
1099
1100                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1101                                                         old_size, new_size);
1102         } else {
1103                 /* this is just created, so create an empty entry. */
1104                 de->inode = 0;
1105                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1106         }
1107 }
1108
1109 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1110                                   struct ext4_iloc *iloc)
1111 {
1112         int ret;
1113         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1114         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1115
1116         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1117                 return -ENOSPC;
1118
1119         ret = ext4_update_inline_data(handle, dir,
1120                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1121         if (ret)
1122                 return ret;
1123
1124         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1125                              EXT4_I(dir)->i_inline_size -
1126                                                 EXT4_MIN_INLINE_DATA_SIZE);
1127         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1128         return 0;
1129 }
1130
1131 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1132                                      struct ext4_iloc *iloc,
1133                                      void *buf, int inline_size)
1134 {
1135         int ret;
1136
1137         ret = ext4_create_inline_data(handle, inode, inline_size);
1138         if (ret) {
1139                 ext4_msg(inode->i_sb, KERN_EMERG,
1140                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1141                         inode->i_ino, ret);
1142                 return;
1143         }
1144         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1145         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1146 }
1147
1148 static int ext4_finish_convert_inline_dir(handle_t *handle,
1149                                           struct inode *inode,
1150                                           struct buffer_head *dir_block,
1151                                           void *buf,
1152                                           int inline_size)
1153 {
1154         int err, csum_size = 0, header_size = 0;
1155         struct ext4_dir_entry_2 *de;
1156         void *target = dir_block->b_data;
1157
1158         /*
1159          * First create "." and ".." and then copy the dir information
1160          * back to the block.
1161          */
1162         de = (struct ext4_dir_entry_2 *)target;
1163         de = ext4_init_dot_dotdot(inode, de,
1164                 inode->i_sb->s_blocksize, csum_size,
1165                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1166         header_size = (void *)de - target;
1167
1168         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1169                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1170
1171         if (ext4_has_metadata_csum(inode->i_sb))
1172                 csum_size = sizeof(struct ext4_dir_entry_tail);
1173
1174         inode->i_size = inode->i_sb->s_blocksize;
1175         i_size_write(inode, inode->i_sb->s_blocksize);
1176         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1177         ext4_update_final_de(dir_block->b_data,
1178                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1179                         inode->i_sb->s_blocksize - csum_size);
1180
1181         if (csum_size)
1182                 ext4_initialize_dirent_tail(dir_block,
1183                                             inode->i_sb->s_blocksize);
1184         set_buffer_uptodate(dir_block);
1185         unlock_buffer(dir_block);
1186         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1187         if (err)
1188                 return err;
1189         set_buffer_verified(dir_block);
1190         return ext4_mark_inode_dirty(handle, inode);
1191 }
1192
1193 static int ext4_convert_inline_data_nolock(handle_t *handle,
1194                                            struct inode *inode,
1195                                            struct ext4_iloc *iloc)
1196 {
1197         int error;
1198         void *buf = NULL;
1199         struct buffer_head *data_bh = NULL;
1200         struct ext4_map_blocks map;
1201         int inline_size;
1202
1203         inline_size = ext4_get_inline_size(inode);
1204         buf = kmalloc(inline_size, GFP_NOFS);
1205         if (!buf) {
1206                 error = -ENOMEM;
1207                 goto out;
1208         }
1209
1210         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1211         if (error < 0)
1212                 goto out;
1213
1214         /*
1215          * Make sure the inline directory entries pass checks before we try to
1216          * convert them, so that we avoid touching stuff that needs fsck.
1217          */
1218         if (S_ISDIR(inode->i_mode)) {
1219                 error = ext4_check_all_de(inode, iloc->bh,
1220                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1221                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1222                 if (error)
1223                         goto out;
1224         }
1225
1226         error = ext4_destroy_inline_data_nolock(handle, inode);
1227         if (error)
1228                 goto out;
1229
1230         map.m_lblk = 0;
1231         map.m_len = 1;
1232         map.m_flags = 0;
1233         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1234         if (error < 0)
1235                 goto out_restore;
1236         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1237                 error = -EIO;
1238                 goto out_restore;
1239         }
1240
1241         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1242         if (!data_bh) {
1243                 error = -ENOMEM;
1244                 goto out_restore;
1245         }
1246
1247         lock_buffer(data_bh);
1248         error = ext4_journal_get_create_access(handle, data_bh);
1249         if (error) {
1250                 unlock_buffer(data_bh);
1251                 error = -EIO;
1252                 goto out_restore;
1253         }
1254         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1255
1256         if (!S_ISDIR(inode->i_mode)) {
1257                 memcpy(data_bh->b_data, buf, inline_size);
1258                 set_buffer_uptodate(data_bh);
1259                 unlock_buffer(data_bh);
1260                 error = ext4_handle_dirty_metadata(handle,
1261                                                    inode, data_bh);
1262         } else {
1263                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1264                                                        buf, inline_size);
1265         }
1266
1267 out_restore:
1268         if (error)
1269                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1270
1271 out:
1272         brelse(data_bh);
1273         kfree(buf);
1274         return error;
1275 }
1276
1277 /*
1278  * Try to add the new entry to the inline data.
1279  * If succeeds, return 0. If not, extended the inline dir and copied data to
1280  * the new created block.
1281  */
1282 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1283                               struct inode *dir, struct inode *inode)
1284 {
1285         int ret, inline_size, no_expand;
1286         void *inline_start;
1287         struct ext4_iloc iloc;
1288
1289         ret = ext4_get_inode_loc(dir, &iloc);
1290         if (ret)
1291                 return ret;
1292
1293         ext4_write_lock_xattr(dir, &no_expand);
1294         if (!ext4_has_inline_data(dir))
1295                 goto out;
1296
1297         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1298                                                  EXT4_INLINE_DOTDOT_SIZE;
1299         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1300
1301         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1302                                         inline_start, inline_size);
1303         if (ret != -ENOSPC)
1304                 goto out;
1305
1306         /* check whether it can be inserted to inline xattr space. */
1307         inline_size = EXT4_I(dir)->i_inline_size -
1308                         EXT4_MIN_INLINE_DATA_SIZE;
1309         if (!inline_size) {
1310                 /* Try to use the xattr space.*/
1311                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1312                 if (ret && ret != -ENOSPC)
1313                         goto out;
1314
1315                 inline_size = EXT4_I(dir)->i_inline_size -
1316                                 EXT4_MIN_INLINE_DATA_SIZE;
1317         }
1318
1319         if (inline_size) {
1320                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1321
1322                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1323                                                 inode, &iloc, inline_start,
1324                                                 inline_size);
1325
1326                 if (ret != -ENOSPC)
1327                         goto out;
1328         }
1329
1330         /*
1331          * The inline space is filled up, so create a new block for it.
1332          * As the extent tree will be created, we have to save the inline
1333          * dir first.
1334          */
1335         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1336
1337 out:
1338         ext4_write_unlock_xattr(dir, &no_expand);
1339         ext4_mark_inode_dirty(handle, dir);
1340         brelse(iloc.bh);
1341         return ret;
1342 }
1343
1344 /*
1345  * This function fills a red-black tree with information from an
1346  * inlined dir.  It returns the number directory entries loaded
1347  * into the tree.  If there is an error it is returned in err.
1348  */
1349 int ext4_inlinedir_to_tree(struct file *dir_file,
1350                            struct inode *dir, ext4_lblk_t block,
1351                            struct dx_hash_info *hinfo,
1352                            __u32 start_hash, __u32 start_minor_hash,
1353                            int *has_inline_data)
1354 {
1355         int err = 0, count = 0;
1356         unsigned int parent_ino;
1357         int pos;
1358         struct ext4_dir_entry_2 *de;
1359         struct inode *inode = file_inode(dir_file);
1360         int ret, inline_size = 0;
1361         struct ext4_iloc iloc;
1362         void *dir_buf = NULL;
1363         struct ext4_dir_entry_2 fake;
1364         struct fscrypt_str tmp_str;
1365
1366         ret = ext4_get_inode_loc(inode, &iloc);
1367         if (ret)
1368                 return ret;
1369
1370         down_read(&EXT4_I(inode)->xattr_sem);
1371         if (!ext4_has_inline_data(inode)) {
1372                 up_read(&EXT4_I(inode)->xattr_sem);
1373                 *has_inline_data = 0;
1374                 goto out;
1375         }
1376
1377         inline_size = ext4_get_inline_size(inode);
1378         dir_buf = kmalloc(inline_size, GFP_NOFS);
1379         if (!dir_buf) {
1380                 ret = -ENOMEM;
1381                 up_read(&EXT4_I(inode)->xattr_sem);
1382                 goto out;
1383         }
1384
1385         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1386         up_read(&EXT4_I(inode)->xattr_sem);
1387         if (ret < 0)
1388                 goto out;
1389
1390         pos = 0;
1391         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1392         while (pos < inline_size) {
1393                 /*
1394                  * As inlined dir doesn't store any information about '.' and
1395                  * only the inode number of '..' is stored, we have to handle
1396                  * them differently.
1397                  */
1398                 if (pos == 0) {
1399                         fake.inode = cpu_to_le32(inode->i_ino);
1400                         fake.name_len = 1;
1401                         strcpy(fake.name, ".");
1402                         fake.rec_len = ext4_rec_len_to_disk(
1403                                                 EXT4_DIR_REC_LEN(fake.name_len),
1404                                                 inline_size);
1405                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1406                         de = &fake;
1407                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1408                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1409                         fake.inode = cpu_to_le32(parent_ino);
1410                         fake.name_len = 2;
1411                         strcpy(fake.name, "..");
1412                         fake.rec_len = ext4_rec_len_to_disk(
1413                                                 EXT4_DIR_REC_LEN(fake.name_len),
1414                                                 inline_size);
1415                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1416                         de = &fake;
1417                         pos = EXT4_INLINE_DOTDOT_SIZE;
1418                 } else {
1419                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1420                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1421                         if (ext4_check_dir_entry(inode, dir_file, de,
1422                                          iloc.bh, dir_buf,
1423                                          inline_size, pos)) {
1424                                 ret = count;
1425                                 goto out;
1426                         }
1427                 }
1428
1429                 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1430                 if ((hinfo->hash < start_hash) ||
1431                     ((hinfo->hash == start_hash) &&
1432                      (hinfo->minor_hash < start_minor_hash)))
1433                         continue;
1434                 if (de->inode == 0)
1435                         continue;
1436                 tmp_str.name = de->name;
1437                 tmp_str.len = de->name_len;
1438                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1439                                               hinfo->minor_hash, de, &tmp_str);
1440                 if (err) {
1441                         ret = err;
1442                         goto out;
1443                 }
1444                 count++;
1445         }
1446         ret = count;
1447 out:
1448         kfree(dir_buf);
1449         brelse(iloc.bh);
1450         return ret;
1451 }
1452
1453 /*
1454  * So this function is called when the volume is mkfsed with
1455  * dir_index disabled. In order to keep f_pos persistent
1456  * after we convert from an inlined dir to a blocked based,
1457  * we just pretend that we are a normal dir and return the
1458  * offset as if '.' and '..' really take place.
1459  *
1460  */
1461 int ext4_read_inline_dir(struct file *file,
1462                          struct dir_context *ctx,
1463                          int *has_inline_data)
1464 {
1465         unsigned int offset, parent_ino;
1466         int i;
1467         struct ext4_dir_entry_2 *de;
1468         struct super_block *sb;
1469         struct inode *inode = file_inode(file);
1470         int ret, inline_size = 0;
1471         struct ext4_iloc iloc;
1472         void *dir_buf = NULL;
1473         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1474
1475         ret = ext4_get_inode_loc(inode, &iloc);
1476         if (ret)
1477                 return ret;
1478
1479         down_read(&EXT4_I(inode)->xattr_sem);
1480         if (!ext4_has_inline_data(inode)) {
1481                 up_read(&EXT4_I(inode)->xattr_sem);
1482                 *has_inline_data = 0;
1483                 goto out;
1484         }
1485
1486         inline_size = ext4_get_inline_size(inode);
1487         dir_buf = kmalloc(inline_size, GFP_NOFS);
1488         if (!dir_buf) {
1489                 ret = -ENOMEM;
1490                 up_read(&EXT4_I(inode)->xattr_sem);
1491                 goto out;
1492         }
1493
1494         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1495         up_read(&EXT4_I(inode)->xattr_sem);
1496         if (ret < 0)
1497                 goto out;
1498
1499         ret = 0;
1500         sb = inode->i_sb;
1501         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1502         offset = ctx->pos;
1503
1504         /*
1505          * dotdot_offset and dotdot_size is the real offset and
1506          * size for ".." and "." if the dir is block based while
1507          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1508          * So we will use extra_offset and extra_size to indicate them
1509          * during the inline dir iteration.
1510          */
1511         dotdot_offset = EXT4_DIR_REC_LEN(1);
1512         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1513         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1514         extra_size = extra_offset + inline_size;
1515
1516         /*
1517          * If the version has changed since the last call to
1518          * readdir(2), then we might be pointing to an invalid
1519          * dirent right now.  Scan from the start of the inline
1520          * dir to make sure.
1521          */
1522         if (!inode_eq_iversion(inode, file->f_version)) {
1523                 for (i = 0; i < extra_size && i < offset;) {
1524                         /*
1525                          * "." is with offset 0 and
1526                          * ".." is dotdot_offset.
1527                          */
1528                         if (!i) {
1529                                 i = dotdot_offset;
1530                                 continue;
1531                         } else if (i == dotdot_offset) {
1532                                 i = dotdot_size;
1533                                 continue;
1534                         }
1535                         /* for other entry, the real offset in
1536                          * the buf has to be tuned accordingly.
1537                          */
1538                         de = (struct ext4_dir_entry_2 *)
1539                                 (dir_buf + i - extra_offset);
1540                         /* It's too expensive to do a full
1541                          * dirent test each time round this
1542                          * loop, but we do have to test at
1543                          * least that it is non-zero.  A
1544                          * failure will be detected in the
1545                          * dirent test below. */
1546                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1547                                 < EXT4_DIR_REC_LEN(1))
1548                                 break;
1549                         i += ext4_rec_len_from_disk(de->rec_len,
1550                                                     extra_size);
1551                 }
1552                 offset = i;
1553                 ctx->pos = offset;
1554                 file->f_version = inode_query_iversion(inode);
1555         }
1556
1557         while (ctx->pos < extra_size) {
1558                 if (ctx->pos == 0) {
1559                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1560                                 goto out;
1561                         ctx->pos = dotdot_offset;
1562                         continue;
1563                 }
1564
1565                 if (ctx->pos == dotdot_offset) {
1566                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1567                                 goto out;
1568                         ctx->pos = dotdot_size;
1569                         continue;
1570                 }
1571
1572                 de = (struct ext4_dir_entry_2 *)
1573                         (dir_buf + ctx->pos - extra_offset);
1574                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1575                                          extra_size, ctx->pos))
1576                         goto out;
1577                 if (le32_to_cpu(de->inode)) {
1578                         if (!dir_emit(ctx, de->name, de->name_len,
1579                                       le32_to_cpu(de->inode),
1580                                       get_dtype(sb, de->file_type)))
1581                                 goto out;
1582                 }
1583                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1584         }
1585 out:
1586         kfree(dir_buf);
1587         brelse(iloc.bh);
1588         return ret;
1589 }
1590
1591 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1592                                         struct ext4_dir_entry_2 **parent_de,
1593                                         int *retval)
1594 {
1595         struct ext4_iloc iloc;
1596
1597         *retval = ext4_get_inode_loc(inode, &iloc);
1598         if (*retval)
1599                 return NULL;
1600
1601         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1602
1603         return iloc.bh;
1604 }
1605
1606 /*
1607  * Try to create the inline data for the new dir.
1608  * If it succeeds, return 0, otherwise return the error.
1609  * In case of ENOSPC, the caller should create the normal disk layout dir.
1610  */
1611 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1612                                struct inode *inode)
1613 {
1614         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1615         struct ext4_iloc iloc;
1616         struct ext4_dir_entry_2 *de;
1617
1618         ret = ext4_get_inode_loc(inode, &iloc);
1619         if (ret)
1620                 return ret;
1621
1622         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1623         if (ret)
1624                 goto out;
1625
1626         /*
1627          * For inline dir, we only save the inode information for the ".."
1628          * and create a fake dentry to cover the left space.
1629          */
1630         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1631         de->inode = cpu_to_le32(parent->i_ino);
1632         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1633         de->inode = 0;
1634         de->rec_len = ext4_rec_len_to_disk(
1635                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1636                                 inline_size);
1637         set_nlink(inode, 2);
1638         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1639 out:
1640         brelse(iloc.bh);
1641         return ret;
1642 }
1643
1644 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1645                                         struct ext4_filename *fname,
1646                                         struct ext4_dir_entry_2 **res_dir,
1647                                         int *has_inline_data)
1648 {
1649         int ret;
1650         struct ext4_iloc iloc;
1651         void *inline_start;
1652         int inline_size;
1653
1654         if (ext4_get_inode_loc(dir, &iloc))
1655                 return NULL;
1656
1657         down_read(&EXT4_I(dir)->xattr_sem);
1658         if (!ext4_has_inline_data(dir)) {
1659                 *has_inline_data = 0;
1660                 goto out;
1661         }
1662
1663         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1664                                                 EXT4_INLINE_DOTDOT_SIZE;
1665         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1666         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1667                               dir, fname, 0, res_dir);
1668         if (ret == 1)
1669                 goto out_find;
1670         if (ret < 0)
1671                 goto out;
1672
1673         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1674                 goto out;
1675
1676         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1677         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1678
1679         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1680                               dir, fname, 0, res_dir);
1681         if (ret == 1)
1682                 goto out_find;
1683
1684 out:
1685         brelse(iloc.bh);
1686         iloc.bh = NULL;
1687 out_find:
1688         up_read(&EXT4_I(dir)->xattr_sem);
1689         return iloc.bh;
1690 }
1691
1692 int ext4_delete_inline_entry(handle_t *handle,
1693                              struct inode *dir,
1694                              struct ext4_dir_entry_2 *de_del,
1695                              struct buffer_head *bh,
1696                              int *has_inline_data)
1697 {
1698         int err, inline_size, no_expand;
1699         struct ext4_iloc iloc;
1700         void *inline_start;
1701
1702         err = ext4_get_inode_loc(dir, &iloc);
1703         if (err)
1704                 return err;
1705
1706         ext4_write_lock_xattr(dir, &no_expand);
1707         if (!ext4_has_inline_data(dir)) {
1708                 *has_inline_data = 0;
1709                 goto out;
1710         }
1711
1712         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1713                 EXT4_MIN_INLINE_DATA_SIZE) {
1714                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1715                                         EXT4_INLINE_DOTDOT_SIZE;
1716                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1717                                 EXT4_INLINE_DOTDOT_SIZE;
1718         } else {
1719                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1720                 inline_size = ext4_get_inline_size(dir) -
1721                                 EXT4_MIN_INLINE_DATA_SIZE;
1722         }
1723
1724         BUFFER_TRACE(bh, "get_write_access");
1725         err = ext4_journal_get_write_access(handle, bh);
1726         if (err)
1727                 goto out;
1728
1729         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1730                                         inline_start, inline_size, 0);
1731         if (err)
1732                 goto out;
1733
1734         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1735 out:
1736         ext4_write_unlock_xattr(dir, &no_expand);
1737         if (likely(err == 0))
1738                 err = ext4_mark_inode_dirty(handle, dir);
1739         brelse(iloc.bh);
1740         if (err != -ENOENT)
1741                 ext4_std_error(dir->i_sb, err);
1742         return err;
1743 }
1744
1745 /*
1746  * Get the inline dentry at offset.
1747  */
1748 static inline struct ext4_dir_entry_2 *
1749 ext4_get_inline_entry(struct inode *inode,
1750                       struct ext4_iloc *iloc,
1751                       unsigned int offset,
1752                       void **inline_start,
1753                       int *inline_size)
1754 {
1755         void *inline_pos;
1756
1757         BUG_ON(offset > ext4_get_inline_size(inode));
1758
1759         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1760                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1761                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1762         } else {
1763                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1764                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1765                 *inline_size = ext4_get_inline_size(inode) -
1766                                 EXT4_MIN_INLINE_DATA_SIZE;
1767         }
1768
1769         if (inline_start)
1770                 *inline_start = inline_pos;
1771         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1772 }
1773
1774 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1775 {
1776         int err, inline_size;
1777         struct ext4_iloc iloc;
1778         size_t inline_len;
1779         void *inline_pos;
1780         unsigned int offset;
1781         struct ext4_dir_entry_2 *de;
1782         bool ret = true;
1783
1784         err = ext4_get_inode_loc(dir, &iloc);
1785         if (err) {
1786                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1787                                  err, dir->i_ino);
1788                 return true;
1789         }
1790
1791         down_read(&EXT4_I(dir)->xattr_sem);
1792         if (!ext4_has_inline_data(dir)) {
1793                 *has_inline_data = 0;
1794                 goto out;
1795         }
1796
1797         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1798         if (!le32_to_cpu(de->inode)) {
1799                 ext4_warning(dir->i_sb,
1800                              "bad inline directory (dir #%lu) - no `..'",
1801                              dir->i_ino);
1802                 ret = true;
1803                 goto out;
1804         }
1805
1806         inline_len = ext4_get_inline_size(dir);
1807         offset = EXT4_INLINE_DOTDOT_SIZE;
1808         while (offset < inline_len) {
1809                 de = ext4_get_inline_entry(dir, &iloc, offset,
1810                                            &inline_pos, &inline_size);
1811                 if (ext4_check_dir_entry(dir, NULL, de,
1812                                          iloc.bh, inline_pos,
1813                                          inline_size, offset)) {
1814                         ext4_warning(dir->i_sb,
1815                                      "bad inline directory (dir #%lu) - "
1816                                      "inode %u, rec_len %u, name_len %d"
1817                                      "inline size %d",
1818                                      dir->i_ino, le32_to_cpu(de->inode),
1819                                      le16_to_cpu(de->rec_len), de->name_len,
1820                                      inline_size);
1821                         ret = true;
1822                         goto out;
1823                 }
1824                 if (le32_to_cpu(de->inode)) {
1825                         ret = false;
1826                         goto out;
1827                 }
1828                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1829         }
1830
1831 out:
1832         up_read(&EXT4_I(dir)->xattr_sem);
1833         brelse(iloc.bh);
1834         return ret;
1835 }
1836
1837 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1838 {
1839         int ret, no_expand;
1840
1841         ext4_write_lock_xattr(inode, &no_expand);
1842         ret = ext4_destroy_inline_data_nolock(handle, inode);
1843         ext4_write_unlock_xattr(inode, &no_expand);
1844
1845         return ret;
1846 }
1847
1848 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1849 {
1850         __u64 addr;
1851         int error = -EAGAIN;
1852         struct ext4_iloc iloc;
1853
1854         down_read(&EXT4_I(inode)->xattr_sem);
1855         if (!ext4_has_inline_data(inode))
1856                 goto out;
1857
1858         error = ext4_get_inode_loc(inode, &iloc);
1859         if (error)
1860                 goto out;
1861
1862         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1863         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1864         addr += offsetof(struct ext4_inode, i_block);
1865
1866         brelse(iloc.bh);
1867
1868         iomap->addr = addr;
1869         iomap->offset = 0;
1870         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1871                               i_size_read(inode));
1872         iomap->type = IOMAP_INLINE;
1873         iomap->flags = 0;
1874
1875 out:
1876         up_read(&EXT4_I(inode)->xattr_sem);
1877         return error;
1878 }
1879
1880 int ext4_inline_data_fiemap(struct inode *inode,
1881                             struct fiemap_extent_info *fieinfo,
1882                             int *has_inline, __u64 start, __u64 len)
1883 {
1884         __u64 physical = 0;
1885         __u64 inline_len;
1886         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1887                 FIEMAP_EXTENT_LAST;
1888         int error = 0;
1889         struct ext4_iloc iloc;
1890
1891         down_read(&EXT4_I(inode)->xattr_sem);
1892         if (!ext4_has_inline_data(inode)) {
1893                 *has_inline = 0;
1894                 goto out;
1895         }
1896         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1897                            i_size_read(inode));
1898         if (start >= inline_len)
1899                 goto out;
1900         if (start + len < inline_len)
1901                 inline_len = start + len;
1902         inline_len -= start;
1903
1904         error = ext4_get_inode_loc(inode, &iloc);
1905         if (error)
1906                 goto out;
1907
1908         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1909         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1910         physical += offsetof(struct ext4_inode, i_block);
1911
1912         brelse(iloc.bh);
1913 out:
1914         up_read(&EXT4_I(inode)->xattr_sem);
1915         if (physical)
1916                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1917                                                 inline_len, flags);
1918         return (error < 0 ? error : 0);
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                 /* Clear the content in the xattr space. */
1962                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1963                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1964                                 goto out_error;
1965
1966                         BUG_ON(is.s.not_found);
1967
1968                         value_len = le32_to_cpu(is.s.here->e_value_size);
1969                         value = kmalloc(value_len, GFP_NOFS);
1970                         if (!value) {
1971                                 err = -ENOMEM;
1972                                 goto out_error;
1973                         }
1974
1975                         err = ext4_xattr_ibody_get(inode, i.name_index,
1976                                                    i.name, value, value_len);
1977                         if (err <= 0)
1978                                 goto out_error;
1979
1980                         i.value = value;
1981                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1982                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1983                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1984                         if (err)
1985                                 goto out_error;
1986                 }
1987
1988                 /* Clear the content within i_blocks. */
1989                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1990                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1991                         memset(p + i_size, 0,
1992                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1993                 }
1994
1995                 EXT4_I(inode)->i_inline_size = i_size <
1996                                         EXT4_MIN_INLINE_DATA_SIZE ?
1997                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1998         }
1999
2000 out_error:
2001         up_write(&EXT4_I(inode)->i_data_sem);
2002 out:
2003         brelse(is.iloc.bh);
2004         ext4_write_unlock_xattr(inode, &no_expand);
2005         kfree(value);
2006         if (inode->i_nlink)
2007                 ext4_orphan_del(handle, inode);
2008
2009         if (err == 0) {
2010                 inode->i_mtime = inode->i_ctime = current_time(inode);
2011                 err = ext4_mark_inode_dirty(handle, inode);
2012                 if (IS_SYNC(inode))
2013                         ext4_handle_sync(handle);
2014         }
2015         ext4_journal_stop(handle);
2016         return err;
2017 }
2018
2019 int ext4_convert_inline_data(struct inode *inode)
2020 {
2021         int error, needed_blocks, no_expand;
2022         handle_t *handle;
2023         struct ext4_iloc iloc;
2024
2025         if (!ext4_has_inline_data(inode)) {
2026                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2027                 return 0;
2028         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2029                 /*
2030                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2031                  * cleared. This means we are in the middle of moving of
2032                  * inline data to delay allocated block. Just force writeout
2033                  * here to finish conversion.
2034                  */
2035                 error = filemap_flush(inode->i_mapping);
2036                 if (error)
2037                         return error;
2038                 if (!ext4_has_inline_data(inode))
2039                         return 0;
2040         }
2041
2042         needed_blocks = ext4_writepage_trans_blocks(inode);
2043
2044         iloc.bh = NULL;
2045         error = ext4_get_inode_loc(inode, &iloc);
2046         if (error)
2047                 return error;
2048
2049         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2050         if (IS_ERR(handle)) {
2051                 error = PTR_ERR(handle);
2052                 goto out_free;
2053         }
2054
2055         ext4_write_lock_xattr(inode, &no_expand);
2056         if (ext4_has_inline_data(inode))
2057                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2058         ext4_write_unlock_xattr(inode, &no_expand);
2059         ext4_journal_stop(handle);
2060 out_free:
2061         brelse(iloc.bh);
2062         return error;
2063 }