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         int free, min_offs;
  36
  37         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  38                         EXT4_GOOD_OLD_INODE_SIZE -
  39                         EXT4_I(inode)->i_extra_isize -
  40                         sizeof(struct ext4_xattr_ibody_header);
  41
  42         /*
  43          * We need to subtract another sizeof(__u32) since an in-inode xattr
  44          * needs an empty 4 bytes to indicate the gap between the xattr entry
  45          * and the name/value pair.
  46          */
  47         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  48                 return EXT4_XATTR_SIZE(min_offs -
  49                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  50                         EXT4_XATTR_ROUND - sizeof(__u32));
  51
  52         raw_inode = ext4_raw_inode(iloc);
  53         header = IHDR(inode, raw_inode);
  54         entry = IFIRST(header);
  55
  56         /* Compute min_offs. */
  57         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  58                 if (!entry->e_value_inum && entry->e_value_size) {
  59                         size_t offs = le16_to_cpu(entry->e_value_offs);
  60                         if (offs < min_offs)
  61                                 min_offs = offs;
  62                 }
  63         }
  64         free = min_offs -
  65                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  66
  67         if (EXT4_I(inode)->i_inline_off) {
  68                 entry = (struct ext4_xattr_entry *)
  69                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  70
  71                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  72                 goto out;
  73         }
  74
  75         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  76
  77         if (free > EXT4_XATTR_ROUND)
  78                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  79         else
  80                 free = 0;
  81
  82 out:
  83         return free;
  84 }
  85
  86 /*
  87  * Get the maximum size we now can store in an inode.
  88  * If we can't find the space for a xattr entry, don't use the space
  89  * of the extents since we have no space to indicate the inline data.
  90  */
  91 int ext4_get_max_inline_size(struct inode *inode)
  92 {
  93         int error, max_inline_size;
  94         struct ext4_iloc iloc;
  95
  96         if (EXT4_I(inode)->i_extra_isize == 0)
  97                 return 0;
  98
  99         error = ext4_get_inode_loc(inode, &iloc);
 100         if (error) {
 101                 ext4_error_inode(inode, __func__, __LINE__, 0,
 102                                  "can't get inode location %lu",
 103                                  inode->i_ino);
 104                 return 0;
 105         }
 106
 107         down_read(&EXT4_I(inode)->xattr_sem);
 108         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 109         up_read(&EXT4_I(inode)->xattr_sem);
 110
 111         brelse(iloc.bh);
 112
 113         if (!max_inline_size)
 114                 return 0;
 115
 116         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 117 }
 118
 119 /*
 120  * this function does not take xattr_sem, which is OK because it is
 121  * currently only used in a code path coming form ext4_iget, before
 122  * the new inode has been unlocked
 123  */
 124 int ext4_find_inline_data_nolock(struct inode *inode)
 125 {
 126         struct ext4_xattr_ibody_find is = {
 127                 .s = { .not_found = -ENODATA, },
 128         };
 129         struct ext4_xattr_info i = {
 130                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 131                 .name = EXT4_XATTR_SYSTEM_DATA,
 132         };
 133         int error;
 134
 135         if (EXT4_I(inode)->i_extra_isize == 0)
 136                 return 0;
 137
 138         error = ext4_get_inode_loc(inode, &is.iloc);
 139         if (error)
 140                 return error;
 141
 142         error = ext4_xattr_ibody_find(inode, &i, &is);
 143         if (error)
 144                 goto out;
 145
 146         if (!is.s.not_found) {
 147                 if (is.s.here->e_value_inum) {
 148                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 149                                          "to an external xattr inode");
 150                         error = -EFSCORRUPTED;
 151                         goto out;
 152                 }
 153                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 154                                         (void *)ext4_raw_inode(&is.iloc));
 155                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 156                                 le32_to_cpu(is.s.here->e_value_size);
 157                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 158         }
 159 out:
 160         brelse(is.iloc.bh);
 161         return error;
 162 }
 163
 164 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 165                                  unsigned int len,
 166                                  struct ext4_iloc *iloc)
 167 {
 168         struct ext4_xattr_entry *entry;
 169         struct ext4_xattr_ibody_header *header;
 170         int cp_len = 0;
 171         struct ext4_inode *raw_inode;
 172
 173         if (!len)
 174                 return 0;
 175
 176         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 177
 178         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 179                         len : EXT4_MIN_INLINE_DATA_SIZE;
 180
 181         raw_inode = ext4_raw_inode(iloc);
 182         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 183
 184         len -= cp_len;
 185         buffer += cp_len;
 186
 187         if (!len)
 188                 goto out;
 189
 190         header = IHDR(inode, raw_inode);
 191         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 192                                             EXT4_I(inode)->i_inline_off);
 193         len = min_t(unsigned int, len,
 194                     (unsigned int)le32_to_cpu(entry->e_value_size));
 195
 196         memcpy(buffer,
 197                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 198         cp_len += len;
 199
 200 out:
 201         return cp_len;
 202 }
 203
 204 /*
 205  * write the buffer to the inline inode.
 206  * If 'create' is set, we don't need to do the extra copy in the xattr
 207  * value since it is already handled by ext4_xattr_ibody_inline_set.
 208  * That saves us one memcpy.
 209  */
 210 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 211                                    void *buffer, loff_t pos, unsigned int len)
 212 {
 213         struct ext4_xattr_entry *entry;
 214         struct ext4_xattr_ibody_header *header;
 215         struct ext4_inode *raw_inode;
 216         int cp_len = 0;
 217
 218         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 219                 return;
 220
 221         BUG_ON(!EXT4_I(inode)->i_inline_off);
 222         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 223
 224         raw_inode = ext4_raw_inode(iloc);
 225         buffer += pos;
 226
 227         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 228                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 229                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 230                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 231
 232                 len -= cp_len;
 233                 buffer += cp_len;
 234                 pos += cp_len;
 235         }
 236
 237         if (!len)
 238                 return;
 239
 240         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 241         header = IHDR(inode, raw_inode);
 242         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 243                                             EXT4_I(inode)->i_inline_off);
 244
 245         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 246                buffer, len);
 247 }
 248
 249 static int ext4_create_inline_data(handle_t *handle,
 250                                    struct inode *inode, unsigned len)
 251 {
 252         int error;
 253         void *value = NULL;
 254         struct ext4_xattr_ibody_find is = {
 255                 .s = { .not_found = -ENODATA, },
 256         };
 257         struct ext4_xattr_info i = {
 258                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 259                 .name = EXT4_XATTR_SYSTEM_DATA,
 260         };
 261
 262         error = ext4_get_inode_loc(inode, &is.iloc);
 263         if (error)
 264                 return error;
 265
 266         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 267         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 268         if (error)
 269                 goto out;
 270
 271         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 272                 value = EXT4_ZERO_XATTR_VALUE;
 273                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 274         } else {
 275                 value = "";
 276                 len = 0;
 277         }
 278
 279         /* Insert the the xttr entry. */
 280         i.value = value;
 281         i.value_len = len;
 282
 283         error = ext4_xattr_ibody_find(inode, &i, &is);
 284         if (error)
 285                 goto out;
 286
 287         BUG_ON(!is.s.not_found);
 288
 289         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 290         if (error) {
 291                 if (error == -ENOSPC)
 292                         ext4_clear_inode_state(inode,
 293                                                EXT4_STATE_MAY_INLINE_DATA);
 294                 goto out;
 295         }
 296
 297         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 298                 0, EXT4_MIN_INLINE_DATA_SIZE);
 299
 300         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 301                                       (void *)ext4_raw_inode(&is.iloc));
 302         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 303         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 304         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 305         get_bh(is.iloc.bh);
 306         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 307
 308 out:
 309         brelse(is.iloc.bh);
 310         return error;
 311 }
 312
 313 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 314                                    unsigned int len)
 315 {
 316         int error;
 317         void *value = NULL;
 318         struct ext4_xattr_ibody_find is = {
 319                 .s = { .not_found = -ENODATA, },
 320         };
 321         struct ext4_xattr_info i = {
 322                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 323                 .name = EXT4_XATTR_SYSTEM_DATA,
 324         };
 325
 326         /* If the old space is ok, write the data directly. */
 327         if (len <= EXT4_I(inode)->i_inline_size)
 328                 return 0;
 329
 330         error = ext4_get_inode_loc(inode, &is.iloc);
 331         if (error)
 332                 return error;
 333
 334         error = ext4_xattr_ibody_find(inode, &i, &is);
 335         if (error)
 336                 goto out;
 337
 338         BUG_ON(is.s.not_found);
 339
 340         len -= EXT4_MIN_INLINE_DATA_SIZE;
 341         value = kzalloc(len, GFP_NOFS);
 342         if (!value) {
 343                 error = -ENOMEM;
 344                 goto out;
 345         }
 346
 347         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 348                                      value, len);
 349         if (error == -ENODATA)
 350                 goto out;
 351
 352         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 353         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 354         if (error)
 355                 goto out;
 356
 357         /* Update the xttr entry. */
 358         i.value = value;
 359         i.value_len = len;
 360
 361         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 362         if (error)
 363                 goto out;
 364
 365         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 366                                       (void *)ext4_raw_inode(&is.iloc));
 367         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 368                                 le32_to_cpu(is.s.here->e_value_size);
 369         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 370         get_bh(is.iloc.bh);
 371         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 372
 373 out:
 374         kfree(value);
 375         brelse(is.iloc.bh);
 376         return error;
 377 }
 378
 379 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 380                                     unsigned int len)
 381 {
 382         int ret, size, no_expand;
 383         struct ext4_inode_info *ei = EXT4_I(inode);
 384
 385         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 386                 return -ENOSPC;
 387
 388         size = ext4_get_max_inline_size(inode);
 389         if (size < len)
 390                 return -ENOSPC;
 391
 392         ext4_write_lock_xattr(inode, &no_expand);
 393
 394         if (ei->i_inline_off)
 395                 ret = ext4_update_inline_data(handle, inode, len);
 396         else
 397                 ret = ext4_create_inline_data(handle, inode, len);
 398
 399         ext4_write_unlock_xattr(inode, &no_expand);
 400         return ret;
 401 }
 402
 403 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 404                                            struct inode *inode)
 405 {
 406         struct ext4_inode_info *ei = EXT4_I(inode);
 407         struct ext4_xattr_ibody_find is = {
 408                 .s = { .not_found = 0, },
 409         };
 410         struct ext4_xattr_info i = {
 411                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 412                 .name = EXT4_XATTR_SYSTEM_DATA,
 413                 .value = NULL,
 414                 .value_len = 0,
 415         };
 416         int error;
 417
 418         if (!ei->i_inline_off)
 419                 return 0;
 420
 421         error = ext4_get_inode_loc(inode, &is.iloc);
 422         if (error)
 423                 return error;
 424
 425         error = ext4_xattr_ibody_find(inode, &i, &is);
 426         if (error)
 427                 goto out;
 428
 429         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 430         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 431         if (error)
 432                 goto out;
 433
 434         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 435         if (error)
 436                 goto out;
 437
 438         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 439                 0, EXT4_MIN_INLINE_DATA_SIZE);
 440         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 441
 442         if (ext4_has_feature_extents(inode->i_sb)) {
 443                 if (S_ISDIR(inode->i_mode) ||
 444                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 445                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 446                         ext4_ext_tree_init(handle, inode);
 447                 }
 448         }
 449         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 450
 451         get_bh(is.iloc.bh);
 452         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 453
 454         EXT4_I(inode)->i_inline_off = 0;
 455         EXT4_I(inode)->i_inline_size = 0;
 456         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 457 out:
 458         brelse(is.iloc.bh);
 459         if (error == -ENODATA)
 460                 error = 0;
 461         return error;
 462 }
 463
 464 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 465 {
 466         void *kaddr;
 467         int ret = 0;
 468         size_t len;
 469         struct ext4_iloc iloc;
 470
 471         BUG_ON(!PageLocked(page));
 472         BUG_ON(!ext4_has_inline_data(inode));
 473         BUG_ON(page->index);
 474
 475         if (!EXT4_I(inode)->i_inline_off) {
 476                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 477                              inode->i_ino);
 478                 goto out;
 479         }
 480
 481         ret = ext4_get_inode_loc(inode, &iloc);
 482         if (ret)
 483                 goto out;
 484
 485         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 486         kaddr = kmap_atomic(page);
 487         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 488         flush_dcache_page(page);
 489         kunmap_atomic(kaddr);
 490         zero_user_segment(page, len, PAGE_SIZE);
 491         SetPageUptodate(page);
 492         brelse(iloc.bh);
 493
 494 out:
 495         return ret;
 496 }
 497
 498 int ext4_readpage_inline(struct inode *inode, struct page *page)
 499 {
 500         int ret = 0;
 501
 502         down_read(&EXT4_I(inode)->xattr_sem);
 503         if (!ext4_has_inline_data(inode)) {
 504                 up_read(&EXT4_I(inode)->xattr_sem);
 505                 return -EAGAIN;
 506         }
 507
 508         /*
 509          * Current inline data can only exist in the 1st page,
 510          * So for all the other pages, just set them uptodate.
 511          */
 512         if (!page->index)
 513                 ret = ext4_read_inline_page(inode, page);
 514         else if (!PageUptodate(page)) {
 515                 zero_user_segment(page, 0, PAGE_SIZE);
 516                 SetPageUptodate(page);
 517         }
 518
 519         up_read(&EXT4_I(inode)->xattr_sem);
 520
 521         unlock_page(page);
 522         return ret >= 0 ? 0 : ret;
 523 }
 524
 525 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 526                                               struct inode *inode,
 527                                               unsigned flags)
 528 {
 529         int ret, needed_blocks, no_expand;
 530         handle_t *handle = NULL;
 531         int retries = 0, sem_held = 0;
 532         struct page *page = NULL;
 533         unsigned from, to;
 534         struct ext4_iloc iloc;
 535
 536         if (!ext4_has_inline_data(inode)) {
 537                 /*
 538                  * clear the flag so that no new write
 539                  * will trap here again.
 540                  */
 541                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 542                 return 0;
 543         }
 544
 545         needed_blocks = ext4_writepage_trans_blocks(inode);
 546
 547         ret = ext4_get_inode_loc(inode, &iloc);
 548         if (ret)
 549                 return ret;
 550
 551 retry:
 552         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 553         if (IS_ERR(handle)) {
 554                 ret = PTR_ERR(handle);
 555                 handle = NULL;
 556                 goto out;
 557         }
 558
 559         /* We cannot recurse into the filesystem as the transaction is already
 560          * started */
 561         flags |= AOP_FLAG_NOFS;
 562
 563         page = grab_cache_page_write_begin(mapping, 0, flags);
 564         if (!page) {
 565                 ret = -ENOMEM;
 566                 goto out;
 567         }
 568
 569         ext4_write_lock_xattr(inode, &no_expand);
 570         sem_held = 1;
 571         /* If some one has already done this for us, just exit. */
 572         if (!ext4_has_inline_data(inode)) {
 573                 ret = 0;
 574                 goto out;
 575         }
 576
 577         from = 0;
 578         to = ext4_get_inline_size(inode);
 579         if (!PageUptodate(page)) {
 580                 ret = ext4_read_inline_page(inode, page);
 581                 if (ret < 0)
 582                         goto out;
 583         }
 584
 585         ret = ext4_destroy_inline_data_nolock(handle, inode);
 586         if (ret)
 587                 goto out;
 588
 589         if (ext4_should_dioread_nolock(inode)) {
 590                 ret = __block_write_begin(page, from, to,
 591                                           ext4_get_block_unwritten);
 592         } else
 593                 ret = __block_write_begin(page, from, to, ext4_get_block);
 594
 595         if (!ret && ext4_should_journal_data(inode)) {
 596                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 597                                              from, to, NULL,
 598                                              do_journal_get_write_access);
 599         }
 600
 601         if (ret) {
 602                 unlock_page(page);
 603                 put_page(page);
 604                 page = NULL;
 605                 ext4_orphan_add(handle, inode);
 606                 ext4_write_unlock_xattr(inode, &no_expand);
 607                 sem_held = 0;
 608                 ext4_journal_stop(handle);
 609                 handle = NULL;
 610                 ext4_truncate_failed_write(inode);
 611                 /*
 612                  * If truncate failed early the inode might
 613                  * still be on the orphan list; we need to
 614                  * make sure the inode is removed from the
 615                  * orphan list in that case.
 616                  */
 617                 if (inode->i_nlink)
 618                         ext4_orphan_del(NULL, inode);
 619         }
 620
 621         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 622                 goto retry;
 623
 624         if (page)
 625                 block_commit_write(page, from, to);
 626 out:
 627         if (page) {
 628                 unlock_page(page);
 629                 put_page(page);
 630         }
 631         if (sem_held)
 632                 ext4_write_unlock_xattr(inode, &no_expand);
 633         if (handle)
 634                 ext4_journal_stop(handle);
 635         brelse(iloc.bh);
 636         return ret;
 637 }
 638
 639 /*
 640  * Try to write data in the inode.
 641  * If the inode has inline data, check whether the new write can be
 642  * in the inode also. If not, create the page the handle, move the data
 643  * to the page make it update and let the later codes create extent for it.
 644  */
 645 int ext4_try_to_write_inline_data(struct address_space *mapping,
 646                                   struct inode *inode,
 647                                   loff_t pos, unsigned len,
 648                                   unsigned flags,
 649                                   struct page **pagep)
 650 {
 651         int ret;
 652         handle_t *handle;
 653         struct page *page;
 654         struct ext4_iloc iloc;
 655
 656         if (pos + len > ext4_get_max_inline_size(inode))
 657                 goto convert;
 658
 659         ret = ext4_get_inode_loc(inode, &iloc);
 660         if (ret)
 661                 return ret;
 662
 663         /*
 664          * The possible write could happen in the inode,
 665          * so try to reserve the space in inode first.
 666          */
 667         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 668         if (IS_ERR(handle)) {
 669                 ret = PTR_ERR(handle);
 670                 handle = NULL;
 671                 goto out;
 672         }
 673
 674         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 675         if (ret && ret != -ENOSPC)
 676                 goto out;
 677
 678         /* We don't have space in inline inode, so convert it to extent. */
 679         if (ret == -ENOSPC) {
 680                 ext4_journal_stop(handle);
 681                 brelse(iloc.bh);
 682                 goto convert;
 683         }
 684
 685         ret = ext4_journal_get_write_access(handle, iloc.bh);
 686         if (ret)
 687                 goto out;
 688
 689         flags |= AOP_FLAG_NOFS;
 690
 691         page = grab_cache_page_write_begin(mapping, 0, flags);
 692         if (!page) {
 693                 ret = -ENOMEM;
 694                 goto out;
 695         }
 696
 697         *pagep = page;
 698         down_read(&EXT4_I(inode)->xattr_sem);
 699         if (!ext4_has_inline_data(inode)) {
 700                 ret = 0;
 701                 unlock_page(page);
 702                 put_page(page);
 703                 goto out_up_read;
 704         }
 705
 706         if (!PageUptodate(page)) {
 707                 ret = ext4_read_inline_page(inode, page);
 708                 if (ret < 0) {
 709                         unlock_page(page);
 710                         put_page(page);
 711                         goto out_up_read;
 712                 }
 713         }
 714
 715         ret = 1;
 716         handle = NULL;
 717 out_up_read:
 718         up_read(&EXT4_I(inode)->xattr_sem);
 719 out:
 720         if (handle && (ret != 1))
 721                 ext4_journal_stop(handle);
 722         brelse(iloc.bh);
 723         return ret;
 724 convert:
 725         return ext4_convert_inline_data_to_extent(mapping,
 726                                                   inode, flags);
 727 }
 728
 729 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 730                                unsigned copied, struct page *page)
 731 {
 732         int ret, no_expand;
 733         void *kaddr;
 734         struct ext4_iloc iloc;
 735
 736         if (unlikely(copied < len)) {
 737                 if (!PageUptodate(page)) {
 738                         copied = 0;
 739                         goto out;
 740                 }
 741         }
 742
 743         ret = ext4_get_inode_loc(inode, &iloc);
 744         if (ret) {
 745                 ext4_std_error(inode->i_sb, ret);
 746                 copied = 0;
 747                 goto out;
 748         }
 749
 750         ext4_write_lock_xattr(inode, &no_expand);
 751         BUG_ON(!ext4_has_inline_data(inode));
 752
 753         /*
 754          * ei->i_inline_off may have changed since ext4_write_begin()
 755          * called ext4_try_to_write_inline_data()
 756          */
 757         (void) ext4_find_inline_data_nolock(inode);
 758
 759         kaddr = kmap_atomic(page);
 760         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 761         kunmap_atomic(kaddr);
 762         SetPageUptodate(page);
 763         /* clear page dirty so that writepages wouldn't work for us. */
 764         ClearPageDirty(page);
 765
 766         ext4_write_unlock_xattr(inode, &no_expand);
 767         brelse(iloc.bh);
 768         mark_inode_dirty(inode);
 769 out:
 770         return copied;
 771 }
 772
 773 struct buffer_head *
 774 ext4_journalled_write_inline_data(struct inode *inode,
 775                                   unsigned len,
 776                                   struct page *page)
 777 {
 778         int ret, no_expand;
 779         void *kaddr;
 780         struct ext4_iloc iloc;
 781
 782         ret = ext4_get_inode_loc(inode, &iloc);
 783         if (ret) {
 784                 ext4_std_error(inode->i_sb, ret);
 785                 return NULL;
 786         }
 787
 788         ext4_write_lock_xattr(inode, &no_expand);
 789         kaddr = kmap_atomic(page);
 790         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 791         kunmap_atomic(kaddr);
 792         ext4_write_unlock_xattr(inode, &no_expand);
 793
 794         return iloc.bh;
 795 }
 796
 797 /*
 798  * Try to make the page cache and handle ready for the inline data case.
 799  * We can call this function in 2 cases:
 800  * 1. The inode is created and the first write exceeds inline size. We can
 801  *    clear the inode state safely.
 802  * 2. The inode has inline data, then we need to read the data, make it
 803  *    update and dirty so that ext4_da_writepages can handle it. We don't
 804  *    need to start the journal since the file's metatdata isn't changed now.
 805  */
 806 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 807                                                  struct inode *inode,
 808                                                  unsigned flags,
 809                                                  void **fsdata)
 810 {
 811         int ret = 0, inline_size;
 812         struct page *page;
 813
 814         page = grab_cache_page_write_begin(mapping, 0, flags);
 815         if (!page)
 816                 return -ENOMEM;
 817
 818         down_read(&EXT4_I(inode)->xattr_sem);
 819         if (!ext4_has_inline_data(inode)) {
 820                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 821                 goto out;
 822         }
 823
 824         inline_size = ext4_get_inline_size(inode);
 825
 826         if (!PageUptodate(page)) {
 827                 ret = ext4_read_inline_page(inode, page);
 828                 if (ret < 0)
 829                         goto out;
 830         }
 831
 832         ret = __block_write_begin(page, 0, inline_size,
 833                                   ext4_da_get_block_prep);
 834         if (ret) {
 835                 up_read(&EXT4_I(inode)->xattr_sem);
 836                 unlock_page(page);
 837                 put_page(page);
 838                 ext4_truncate_failed_write(inode);
 839                 return ret;
 840         }
 841
 842         SetPageDirty(page);
 843         SetPageUptodate(page);
 844         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 845         *fsdata = (void *)CONVERT_INLINE_DATA;
 846
 847 out:
 848         up_read(&EXT4_I(inode)->xattr_sem);
 849         if (page) {
 850                 unlock_page(page);
 851                 put_page(page);
 852         }
 853         return ret;
 854 }
 855
 856 /*
 857  * Prepare the write for the inline data.
 858  * If the the data can be written into the inode, we just read
 859  * the page and make it uptodate, and start the journal.
 860  * Otherwise read the page, makes it dirty so that it can be
 861  * handle in writepages(the i_disksize update is left to the
 862  * normal ext4_da_write_end).
 863  */
 864 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 865                                     struct inode *inode,
 866                                     loff_t pos, unsigned len,
 867                                     unsigned flags,
 868                                     struct page **pagep,
 869                                     void **fsdata)
 870 {
 871         int ret, inline_size;
 872         handle_t *handle;
 873         struct page *page;
 874         struct ext4_iloc iloc;
 875         int retries = 0;
 876
 877         ret = ext4_get_inode_loc(inode, &iloc);
 878         if (ret)
 879                 return ret;
 880
 881 retry_journal:
 882         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 883         if (IS_ERR(handle)) {
 884                 ret = PTR_ERR(handle);
 885                 goto out;
 886         }
 887
 888         inline_size = ext4_get_max_inline_size(inode);
 889
 890         ret = -ENOSPC;
 891         if (inline_size >= pos + len) {
 892                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 893                 if (ret && ret != -ENOSPC)
 894                         goto out_journal;
 895         }
 896
 897         /*
 898          * We cannot recurse into the filesystem as the transaction
 899          * is already started.
 900          */
 901         flags |= AOP_FLAG_NOFS;
 902
 903         if (ret == -ENOSPC) {
 904                 ext4_journal_stop(handle);
 905                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 906                                                             inode,
 907                                                             flags,
 908                                                             fsdata);
 909                 if (ret == -ENOSPC &&
 910                     ext4_should_retry_alloc(inode->i_sb, &retries))
 911                         goto retry_journal;
 912                 goto out;
 913         }
 914
 915         page = grab_cache_page_write_begin(mapping, 0, flags);
 916         if (!page) {
 917                 ret = -ENOMEM;
 918                 goto out_journal;
 919         }
 920
 921         down_read(&EXT4_I(inode)->xattr_sem);
 922         if (!ext4_has_inline_data(inode)) {
 923                 ret = 0;
 924                 goto out_release_page;
 925         }
 926
 927         if (!PageUptodate(page)) {
 928                 ret = ext4_read_inline_page(inode, page);
 929                 if (ret < 0)
 930                         goto out_release_page;
 931         }
 932         ret = ext4_journal_get_write_access(handle, iloc.bh);
 933         if (ret)
 934                 goto out_release_page;
 935
 936         up_read(&EXT4_I(inode)->xattr_sem);
 937         *pagep = page;
 938         brelse(iloc.bh);
 939         return 1;
 940 out_release_page:
 941         up_read(&EXT4_I(inode)->xattr_sem);
 942         unlock_page(page);
 943         put_page(page);
 944 out_journal:
 945         ext4_journal_stop(handle);
 946 out:
 947         brelse(iloc.bh);
 948         return ret;
 949 }
 950
 951 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 952                                   unsigned len, unsigned copied,
 953                                   struct page *page)
 954 {
 955         int ret;
 956
 957         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 958         if (ret < 0) {
 959                 unlock_page(page);
 960                 put_page(page);
 961                 return ret;
 962         }
 963         copied = ret;
 964
 965         /*
 966          * No need to use i_size_read() here, the i_size
 967          * cannot change under us because we hold i_mutex.
 968          *
 969          * But it's important to update i_size while still holding page lock:
 970          * page writeout could otherwise come in and zero beyond i_size.
 971          */
 972         if (pos+copied > inode->i_size)
 973                 i_size_write(inode, pos+copied);
 974         unlock_page(page);
 975         put_page(page);
 976
 977         /*
 978          * Don't mark the inode dirty under page lock. First, it unnecessarily
 979          * makes the holding time of page lock longer. Second, it forces lock
 980          * ordering of page lock and transaction start for journaling
 981          * filesystems.
 982          */
 983         mark_inode_dirty(inode);
 984
 985         return copied;
 986 }
 987
 988 #ifdef INLINE_DIR_DEBUG
 989 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 990                           void *inline_start, int inline_size)
 991 {
 992         int offset;
 993         unsigned short de_len;
 994         struct ext4_dir_entry_2 *de = inline_start;
 995         void *dlimit = inline_start + inline_size;
 996
 997         trace_printk("inode %lu\n", dir->i_ino);
 998         offset = 0;
 999         while ((void *)de < dlimit) {
1000                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1001                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1002                              offset, de_len, de->name_len, de->name,
1003                              de->name_len, le32_to_cpu(de->inode));
1004                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1005                                          inline_start, inline_size, offset))
1006                         BUG();
1007
1008                 offset += de_len;
1009                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1010         }
1011 }
1012 #else
1013 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1014 #endif
1015
1016 /*
1017  * Add a new entry into a inline dir.
1018  * It will return -ENOSPC if no space is available, and -EIO
1019  * and -EEXIST if directory entry already exists.
1020  */
1021 static int ext4_add_dirent_to_inline(handle_t *handle,
1022                                      struct ext4_filename *fname,
1023                                      struct inode *dir,
1024                                      struct inode *inode,
1025                                      struct ext4_iloc *iloc,
1026                                      void *inline_start, int inline_size)
1027 {
1028         int             err;
1029         struct ext4_dir_entry_2 *de;
1030
1031         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1032                                 inline_size, fname, &de);
1033         if (err)
1034                 return err;
1035
1036         BUFFER_TRACE(iloc->bh, "get_write_access");
1037         err = ext4_journal_get_write_access(handle, iloc->bh);
1038         if (err)
1039                 return err;
1040         ext4_insert_dentry(inode, de, inline_size, fname);
1041
1042         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1043
1044         /*
1045          * XXX shouldn't update any times until successful
1046          * completion of syscall, but too many callers depend
1047          * on this.
1048          *
1049          * XXX similarly, too many callers depend on
1050          * ext4_new_inode() setting the times, but error
1051          * recovery deletes the inode, so the worst that can
1052          * happen is that the times are slightly out of date
1053          * and/or different from the directory change time.
1054          */
1055         dir->i_mtime = dir->i_ctime = current_time(dir);
1056         ext4_update_dx_flag(dir);
1057         inode_inc_iversion(dir);
1058         return 1;
1059 }
1060
1061 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1062                                        struct ext4_iloc *iloc)
1063 {
1064         struct ext4_xattr_entry *entry;
1065         struct ext4_xattr_ibody_header *header;
1066
1067         BUG_ON(!EXT4_I(inode)->i_inline_off);
1068
1069         header = IHDR(inode, ext4_raw_inode(iloc));
1070         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1071                                             EXT4_I(inode)->i_inline_off);
1072
1073         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1074 }
1075
1076 /* Set the final de to cover the whole block. */
1077 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1078 {
1079         struct ext4_dir_entry_2 *de, *prev_de;
1080         void *limit;
1081         int de_len;
1082
1083         de = (struct ext4_dir_entry_2 *)de_buf;
1084         if (old_size) {
1085                 limit = de_buf + old_size;
1086                 do {
1087                         prev_de = de;
1088                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1089                         de_buf += de_len;
1090                         de = (struct ext4_dir_entry_2 *)de_buf;
1091                 } while (de_buf < limit);
1092
1093                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1094                                                         old_size, new_size);
1095         } else {
1096                 /* this is just created, so create an empty entry. */
1097                 de->inode = 0;
1098                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1099         }
1100 }
1101
1102 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1103                                   struct ext4_iloc *iloc)
1104 {
1105         int ret;
1106         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1107         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1108
1109         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1110                 return -ENOSPC;
1111
1112         ret = ext4_update_inline_data(handle, dir,
1113                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1114         if (ret)
1115                 return ret;
1116
1117         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1118                              EXT4_I(dir)->i_inline_size -
1119                                                 EXT4_MIN_INLINE_DATA_SIZE);
1120         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1121         return 0;
1122 }
1123
1124 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1125                                      struct ext4_iloc *iloc,
1126                                      void *buf, int inline_size)
1127 {
1128         ext4_create_inline_data(handle, inode, inline_size);
1129         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1130         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1131 }
1132
1133 static int ext4_finish_convert_inline_dir(handle_t *handle,
1134                                           struct inode *inode,
1135                                           struct buffer_head *dir_block,
1136                                           void *buf,
1137                                           int inline_size)
1138 {
1139         int err, csum_size = 0, header_size = 0;
1140         struct ext4_dir_entry_2 *de;
1141         struct ext4_dir_entry_tail *t;
1142         void *target = dir_block->b_data;
1143
1144         /*
1145          * First create "." and ".." and then copy the dir information
1146          * back to the block.
1147          */
1148         de = (struct ext4_dir_entry_2 *)target;
1149         de = ext4_init_dot_dotdot(inode, de,
1150                 inode->i_sb->s_blocksize, csum_size,
1151                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1152         header_size = (void *)de - target;
1153
1154         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1155                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1156
1157         if (ext4_has_metadata_csum(inode->i_sb))
1158                 csum_size = sizeof(struct ext4_dir_entry_tail);
1159
1160         inode->i_size = inode->i_sb->s_blocksize;
1161         i_size_write(inode, inode->i_sb->s_blocksize);
1162         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1163         ext4_update_final_de(dir_block->b_data,
1164                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1165                         inode->i_sb->s_blocksize - csum_size);
1166
1167         if (csum_size) {
1168                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1169                                      inode->i_sb->s_blocksize);
1170                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1171         }
1172         set_buffer_uptodate(dir_block);
1173         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1174         if (err)
1175                 return err;
1176         set_buffer_verified(dir_block);
1177         return ext4_mark_inode_dirty(handle, inode);
1178 }
1179
1180 static int ext4_convert_inline_data_nolock(handle_t *handle,
1181                                            struct inode *inode,
1182                                            struct ext4_iloc *iloc)
1183 {
1184         int error;
1185         void *buf = NULL;
1186         struct buffer_head *data_bh = NULL;
1187         struct ext4_map_blocks map;
1188         int inline_size;
1189
1190         inline_size = ext4_get_inline_size(inode);
1191         buf = kmalloc(inline_size, GFP_NOFS);
1192         if (!buf) {
1193                 error = -ENOMEM;
1194                 goto out;
1195         }
1196
1197         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1198         if (error < 0)
1199                 goto out;
1200
1201         /*
1202          * Make sure the inline directory entries pass checks before we try to
1203          * convert them, so that we avoid touching stuff that needs fsck.
1204          */
1205         if (S_ISDIR(inode->i_mode)) {
1206                 error = ext4_check_all_de(inode, iloc->bh,
1207                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1208                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1209                 if (error)
1210                         goto out;
1211         }
1212
1213         error = ext4_destroy_inline_data_nolock(handle, inode);
1214         if (error)
1215                 goto out;
1216
1217         map.m_lblk = 0;
1218         map.m_len = 1;
1219         map.m_flags = 0;
1220         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1221         if (error < 0)
1222                 goto out_restore;
1223         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1224                 error = -EIO;
1225                 goto out_restore;
1226         }
1227
1228         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1229         if (!data_bh) {
1230                 error = -ENOMEM;
1231                 goto out_restore;
1232         }
1233
1234         lock_buffer(data_bh);
1235         error = ext4_journal_get_create_access(handle, data_bh);
1236         if (error) {
1237                 unlock_buffer(data_bh);
1238                 error = -EIO;
1239                 goto out_restore;
1240         }
1241         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1242
1243         if (!S_ISDIR(inode->i_mode)) {
1244                 memcpy(data_bh->b_data, buf, inline_size);
1245                 set_buffer_uptodate(data_bh);
1246                 error = ext4_handle_dirty_metadata(handle,
1247                                                    inode, data_bh);
1248         } else {
1249                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1250                                                        buf, inline_size);
1251         }
1252
1253         unlock_buffer(data_bh);
1254 out_restore:
1255         if (error)
1256                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1257
1258 out:
1259         brelse(data_bh);
1260         kfree(buf);
1261         return error;
1262 }
1263
1264 /*
1265  * Try to add the new entry to the inline data.
1266  * If succeeds, return 0. If not, extended the inline dir and copied data to
1267  * the new created block.
1268  */
1269 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1270                               struct inode *dir, struct inode *inode)
1271 {
1272         int ret, inline_size, no_expand;
1273         void *inline_start;
1274         struct ext4_iloc iloc;
1275
1276         ret = ext4_get_inode_loc(dir, &iloc);
1277         if (ret)
1278                 return ret;
1279
1280         ext4_write_lock_xattr(dir, &no_expand);
1281         if (!ext4_has_inline_data(dir))
1282                 goto out;
1283
1284         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1285                                                  EXT4_INLINE_DOTDOT_SIZE;
1286         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1287
1288         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1289                                         inline_start, inline_size);
1290         if (ret != -ENOSPC)
1291                 goto out;
1292
1293         /* check whether it can be inserted to inline xattr space. */
1294         inline_size = EXT4_I(dir)->i_inline_size -
1295                         EXT4_MIN_INLINE_DATA_SIZE;
1296         if (!inline_size) {
1297                 /* Try to use the xattr space.*/
1298                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1299                 if (ret && ret != -ENOSPC)
1300                         goto out;
1301
1302                 inline_size = EXT4_I(dir)->i_inline_size -
1303                                 EXT4_MIN_INLINE_DATA_SIZE;
1304         }
1305
1306         if (inline_size) {
1307                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1308
1309                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1310                                                 inode, &iloc, inline_start,
1311                                                 inline_size);
1312
1313                 if (ret != -ENOSPC)
1314                         goto out;
1315         }
1316
1317         /*
1318          * The inline space is filled up, so create a new block for it.
1319          * As the extent tree will be created, we have to save the inline
1320          * dir first.
1321          */
1322         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1323
1324 out:
1325         ext4_write_unlock_xattr(dir, &no_expand);
1326         ext4_mark_inode_dirty(handle, dir);
1327         brelse(iloc.bh);
1328         return ret;
1329 }
1330
1331 /*
1332  * This function fills a red-black tree with information from an
1333  * inlined dir.  It returns the number directory entries loaded
1334  * into the tree.  If there is an error it is returned in err.
1335  */
1336 int htree_inlinedir_to_tree(struct file *dir_file,
1337                             struct inode *dir, ext4_lblk_t block,
1338                             struct dx_hash_info *hinfo,
1339                             __u32 start_hash, __u32 start_minor_hash,
1340                             int *has_inline_data)
1341 {
1342         int err = 0, count = 0;
1343         unsigned int parent_ino;
1344         int pos;
1345         struct ext4_dir_entry_2 *de;
1346         struct inode *inode = file_inode(dir_file);
1347         int ret, inline_size = 0;
1348         struct ext4_iloc iloc;
1349         void *dir_buf = NULL;
1350         struct ext4_dir_entry_2 fake;
1351         struct fscrypt_str tmp_str;
1352
1353         ret = ext4_get_inode_loc(inode, &iloc);
1354         if (ret)
1355                 return ret;
1356
1357         down_read(&EXT4_I(inode)->xattr_sem);
1358         if (!ext4_has_inline_data(inode)) {
1359                 up_read(&EXT4_I(inode)->xattr_sem);
1360                 *has_inline_data = 0;
1361                 goto out;
1362         }
1363
1364         inline_size = ext4_get_inline_size(inode);
1365         dir_buf = kmalloc(inline_size, GFP_NOFS);
1366         if (!dir_buf) {
1367                 ret = -ENOMEM;
1368                 up_read(&EXT4_I(inode)->xattr_sem);
1369                 goto out;
1370         }
1371
1372         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1373         up_read(&EXT4_I(inode)->xattr_sem);
1374         if (ret < 0)
1375                 goto out;
1376
1377         pos = 0;
1378         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1379         while (pos < inline_size) {
1380                 /*
1381                  * As inlined dir doesn't store any information about '.' and
1382                  * only the inode number of '..' is stored, we have to handle
1383                  * them differently.
1384                  */
1385                 if (pos == 0) {
1386                         fake.inode = cpu_to_le32(inode->i_ino);
1387                         fake.name_len = 1;
1388                         strcpy(fake.name, ".");
1389                         fake.rec_len = ext4_rec_len_to_disk(
1390                                                 EXT4_DIR_REC_LEN(fake.name_len),
1391                                                 inline_size);
1392                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1393                         de = &fake;
1394                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1395                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1396                         fake.inode = cpu_to_le32(parent_ino);
1397                         fake.name_len = 2;
1398                         strcpy(fake.name, "..");
1399                         fake.rec_len = ext4_rec_len_to_disk(
1400                                                 EXT4_DIR_REC_LEN(fake.name_len),
1401                                                 inline_size);
1402                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1403                         de = &fake;
1404                         pos = EXT4_INLINE_DOTDOT_SIZE;
1405                 } else {
1406                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1407                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1408                         if (ext4_check_dir_entry(inode, dir_file, de,
1409                                          iloc.bh, dir_buf,
1410                                          inline_size, pos)) {
1411                                 ret = count;
1412                                 goto out;
1413                         }
1414                 }
1415
1416                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1417                 if ((hinfo->hash < start_hash) ||
1418                     ((hinfo->hash == start_hash) &&
1419                      (hinfo->minor_hash < start_minor_hash)))
1420                         continue;
1421                 if (de->inode == 0)
1422                         continue;
1423                 tmp_str.name = de->name;
1424                 tmp_str.len = de->name_len;
1425                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1426                                               hinfo->minor_hash, de, &tmp_str);
1427                 if (err) {
1428                         ret = err;
1429                         goto out;
1430                 }
1431                 count++;
1432         }
1433         ret = count;
1434 out:
1435         kfree(dir_buf);
1436         brelse(iloc.bh);
1437         return ret;
1438 }
1439
1440 /*
1441  * So this function is called when the volume is mkfsed with
1442  * dir_index disabled. In order to keep f_pos persistent
1443  * after we convert from an inlined dir to a blocked based,
1444  * we just pretend that we are a normal dir and return the
1445  * offset as if '.' and '..' really take place.
1446  *
1447  */
1448 int ext4_read_inline_dir(struct file *file,
1449                          struct dir_context *ctx,
1450                          int *has_inline_data)
1451 {
1452         unsigned int offset, parent_ino;
1453         int i;
1454         struct ext4_dir_entry_2 *de;
1455         struct super_block *sb;
1456         struct inode *inode = file_inode(file);
1457         int ret, inline_size = 0;
1458         struct ext4_iloc iloc;
1459         void *dir_buf = NULL;
1460         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1461
1462         ret = ext4_get_inode_loc(inode, &iloc);
1463         if (ret)
1464                 return ret;
1465
1466         down_read(&EXT4_I(inode)->xattr_sem);
1467         if (!ext4_has_inline_data(inode)) {
1468                 up_read(&EXT4_I(inode)->xattr_sem);
1469                 *has_inline_data = 0;
1470                 goto out;
1471         }
1472
1473         inline_size = ext4_get_inline_size(inode);
1474         dir_buf = kmalloc(inline_size, GFP_NOFS);
1475         if (!dir_buf) {
1476                 ret = -ENOMEM;
1477                 up_read(&EXT4_I(inode)->xattr_sem);
1478                 goto out;
1479         }
1480
1481         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1482         up_read(&EXT4_I(inode)->xattr_sem);
1483         if (ret < 0)
1484                 goto out;
1485
1486         ret = 0;
1487         sb = inode->i_sb;
1488         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1489         offset = ctx->pos;
1490
1491         /*
1492          * dotdot_offset and dotdot_size is the real offset and
1493          * size for ".." and "." if the dir is block based while
1494          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1495          * So we will use extra_offset and extra_size to indicate them
1496          * during the inline dir iteration.
1497          */
1498         dotdot_offset = EXT4_DIR_REC_LEN(1);
1499         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1500         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1501         extra_size = extra_offset + inline_size;
1502
1503         /*
1504          * If the version has changed since the last call to
1505          * readdir(2), then we might be pointing to an invalid
1506          * dirent right now.  Scan from the start of the inline
1507          * dir to make sure.
1508          */
1509         if (!inode_eq_iversion(inode, file->f_version)) {
1510                 for (i = 0; i < extra_size && i < offset;) {
1511                         /*
1512                          * "." is with offset 0 and
1513                          * ".." is dotdot_offset.
1514                          */
1515                         if (!i) {
1516                                 i = dotdot_offset;
1517                                 continue;
1518                         } else if (i == dotdot_offset) {
1519                                 i = dotdot_size;
1520                                 continue;
1521                         }
1522                         /* for other entry, the real offset in
1523                          * the buf has to be tuned accordingly.
1524                          */
1525                         de = (struct ext4_dir_entry_2 *)
1526                                 (dir_buf + i - extra_offset);
1527                         /* It's too expensive to do a full
1528                          * dirent test each time round this
1529                          * loop, but we do have to test at
1530                          * least that it is non-zero.  A
1531                          * failure will be detected in the
1532                          * dirent test below. */
1533                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1534                                 < EXT4_DIR_REC_LEN(1))
1535                                 break;
1536                         i += ext4_rec_len_from_disk(de->rec_len,
1537                                                     extra_size);
1538                 }
1539                 offset = i;
1540                 ctx->pos = offset;
1541                 file->f_version = inode_query_iversion(inode);
1542         }
1543
1544         while (ctx->pos < extra_size) {
1545                 if (ctx->pos == 0) {
1546                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1547                                 goto out;
1548                         ctx->pos = dotdot_offset;
1549                         continue;
1550                 }
1551
1552                 if (ctx->pos == dotdot_offset) {
1553                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1554                                 goto out;
1555                         ctx->pos = dotdot_size;
1556                         continue;
1557                 }
1558
1559                 de = (struct ext4_dir_entry_2 *)
1560                         (dir_buf + ctx->pos - extra_offset);
1561                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1562                                          extra_size, ctx->pos))
1563                         goto out;
1564                 if (le32_to_cpu(de->inode)) {
1565                         if (!dir_emit(ctx, de->name, de->name_len,
1566                                       le32_to_cpu(de->inode),
1567                                       get_dtype(sb, de->file_type)))
1568                                 goto out;
1569                 }
1570                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1571         }
1572 out:
1573         kfree(dir_buf);
1574         brelse(iloc.bh);
1575         return ret;
1576 }
1577
1578 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1579                                         struct ext4_dir_entry_2 **parent_de,
1580                                         int *retval)
1581 {
1582         struct ext4_iloc iloc;
1583
1584         *retval = ext4_get_inode_loc(inode, &iloc);
1585         if (*retval)
1586                 return NULL;
1587
1588         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1589
1590         return iloc.bh;
1591 }
1592
1593 /*
1594  * Try to create the inline data for the new dir.
1595  * If it succeeds, return 0, otherwise return the error.
1596  * In case of ENOSPC, the caller should create the normal disk layout dir.
1597  */
1598 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1599                                struct inode *inode)
1600 {
1601         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1602         struct ext4_iloc iloc;
1603         struct ext4_dir_entry_2 *de;
1604
1605         ret = ext4_get_inode_loc(inode, &iloc);
1606         if (ret)
1607                 return ret;
1608
1609         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1610         if (ret)
1611                 goto out;
1612
1613         /*
1614          * For inline dir, we only save the inode information for the ".."
1615          * and create a fake dentry to cover the left space.
1616          */
1617         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1618         de->inode = cpu_to_le32(parent->i_ino);
1619         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1620         de->inode = 0;
1621         de->rec_len = ext4_rec_len_to_disk(
1622                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1623                                 inline_size);
1624         set_nlink(inode, 2);
1625         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1626 out:
1627         brelse(iloc.bh);
1628         return ret;
1629 }
1630
1631 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1632                                         struct ext4_filename *fname,
1633                                         struct ext4_dir_entry_2 **res_dir,
1634                                         int *has_inline_data)
1635 {
1636         int ret;
1637         struct ext4_iloc iloc;
1638         void *inline_start;
1639         int inline_size;
1640
1641         if (ext4_get_inode_loc(dir, &iloc))
1642                 return NULL;
1643
1644         down_read(&EXT4_I(dir)->xattr_sem);
1645         if (!ext4_has_inline_data(dir)) {
1646                 *has_inline_data = 0;
1647                 goto out;
1648         }
1649
1650         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1651                                                 EXT4_INLINE_DOTDOT_SIZE;
1652         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1653         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1654                               dir, fname, 0, res_dir);
1655         if (ret == 1)
1656                 goto out_find;
1657         if (ret < 0)
1658                 goto out;
1659
1660         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1661                 goto out;
1662
1663         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1664         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1665
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
1671 out:
1672         brelse(iloc.bh);
1673         iloc.bh = NULL;
1674 out_find:
1675         up_read(&EXT4_I(dir)->xattr_sem);
1676         return iloc.bh;
1677 }
1678
1679 int ext4_delete_inline_entry(handle_t *handle,
1680                              struct inode *dir,
1681                              struct ext4_dir_entry_2 *de_del,
1682                              struct buffer_head *bh,
1683                              int *has_inline_data)
1684 {
1685         int err, inline_size, no_expand;
1686         struct ext4_iloc iloc;
1687         void *inline_start;
1688
1689         err = ext4_get_inode_loc(dir, &iloc);
1690         if (err)
1691                 return err;
1692
1693         ext4_write_lock_xattr(dir, &no_expand);
1694         if (!ext4_has_inline_data(dir)) {
1695                 *has_inline_data = 0;
1696                 goto out;
1697         }
1698
1699         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1700                 EXT4_MIN_INLINE_DATA_SIZE) {
1701                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1702                                         EXT4_INLINE_DOTDOT_SIZE;
1703                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1704                                 EXT4_INLINE_DOTDOT_SIZE;
1705         } else {
1706                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1707                 inline_size = ext4_get_inline_size(dir) -
1708                                 EXT4_MIN_INLINE_DATA_SIZE;
1709         }
1710
1711         BUFFER_TRACE(bh, "get_write_access");
1712         err = ext4_journal_get_write_access(handle, bh);
1713         if (err)
1714                 goto out;
1715
1716         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1717                                         inline_start, inline_size, 0);
1718         if (err)
1719                 goto out;
1720
1721         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1722 out:
1723         ext4_write_unlock_xattr(dir, &no_expand);
1724         if (likely(err == 0))
1725                 err = ext4_mark_inode_dirty(handle, dir);
1726         brelse(iloc.bh);
1727         if (err != -ENOENT)
1728                 ext4_std_error(dir->i_sb, err);
1729         return err;
1730 }
1731
1732 /*
1733  * Get the inline dentry at offset.
1734  */
1735 static inline struct ext4_dir_entry_2 *
1736 ext4_get_inline_entry(struct inode *inode,
1737                       struct ext4_iloc *iloc,
1738                       unsigned int offset,
1739                       void **inline_start,
1740                       int *inline_size)
1741 {
1742         void *inline_pos;
1743
1744         BUG_ON(offset > ext4_get_inline_size(inode));
1745
1746         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1747                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1748                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1749         } else {
1750                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1751                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1752                 *inline_size = ext4_get_inline_size(inode) -
1753                                 EXT4_MIN_INLINE_DATA_SIZE;
1754         }
1755
1756         if (inline_start)
1757                 *inline_start = inline_pos;
1758         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1759 }
1760
1761 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1762 {
1763         int err, inline_size;
1764         struct ext4_iloc iloc;
1765         size_t inline_len;
1766         void *inline_pos;
1767         unsigned int offset;
1768         struct ext4_dir_entry_2 *de;
1769         bool ret = true;
1770
1771         err = ext4_get_inode_loc(dir, &iloc);
1772         if (err) {
1773                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1774                                  err, dir->i_ino);
1775                 return true;
1776         }
1777
1778         down_read(&EXT4_I(dir)->xattr_sem);
1779         if (!ext4_has_inline_data(dir)) {
1780                 *has_inline_data = 0;
1781                 goto out;
1782         }
1783
1784         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1785         if (!le32_to_cpu(de->inode)) {
1786                 ext4_warning(dir->i_sb,
1787                              "bad inline directory (dir #%lu) - no `..'",
1788                              dir->i_ino);
1789                 ret = true;
1790                 goto out;
1791         }
1792
1793         inline_len = ext4_get_inline_size(dir);
1794         offset = EXT4_INLINE_DOTDOT_SIZE;
1795         while (offset < inline_len) {
1796                 de = ext4_get_inline_entry(dir, &iloc, offset,
1797                                            &inline_pos, &inline_size);
1798                 if (ext4_check_dir_entry(dir, NULL, de,
1799                                          iloc.bh, inline_pos,
1800                                          inline_size, offset)) {
1801                         ext4_warning(dir->i_sb,
1802                                      "bad inline directory (dir #%lu) - "
1803                                      "inode %u, rec_len %u, name_len %d"
1804                                      "inline size %d",
1805                                      dir->i_ino, le32_to_cpu(de->inode),
1806                                      le16_to_cpu(de->rec_len), de->name_len,
1807                                      inline_size);
1808                         ret = true;
1809                         goto out;
1810                 }
1811                 if (le32_to_cpu(de->inode)) {
1812                         ret = false;
1813                         goto out;
1814                 }
1815                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1816         }
1817
1818 out:
1819         up_read(&EXT4_I(dir)->xattr_sem);
1820         brelse(iloc.bh);
1821         return ret;
1822 }
1823
1824 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1825 {
1826         int ret, no_expand;
1827
1828         ext4_write_lock_xattr(inode, &no_expand);
1829         ret = ext4_destroy_inline_data_nolock(handle, inode);
1830         ext4_write_unlock_xattr(inode, &no_expand);
1831
1832         return ret;
1833 }
1834
1835 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1836 {
1837         __u64 addr;
1838         int error = -EAGAIN;
1839         struct ext4_iloc iloc;
1840
1841         down_read(&EXT4_I(inode)->xattr_sem);
1842         if (!ext4_has_inline_data(inode))
1843                 goto out;
1844
1845         error = ext4_get_inode_loc(inode, &iloc);
1846         if (error)
1847                 goto out;
1848
1849         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1850         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1851         addr += offsetof(struct ext4_inode, i_block);
1852
1853         brelse(iloc.bh);
1854
1855         iomap->addr = addr;
1856         iomap->offset = 0;
1857         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1858                               i_size_read(inode));
1859         iomap->type = IOMAP_INLINE;
1860         iomap->flags = 0;
1861
1862 out:
1863         up_read(&EXT4_I(inode)->xattr_sem);
1864         return error;
1865 }
1866
1867 int ext4_inline_data_fiemap(struct inode *inode,
1868                             struct fiemap_extent_info *fieinfo,
1869                             int *has_inline, __u64 start, __u64 len)
1870 {
1871         __u64 physical = 0;
1872         __u64 inline_len;
1873         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1874                 FIEMAP_EXTENT_LAST;
1875         int error = 0;
1876         struct ext4_iloc iloc;
1877
1878         down_read(&EXT4_I(inode)->xattr_sem);
1879         if (!ext4_has_inline_data(inode)) {
1880                 *has_inline = 0;
1881                 goto out;
1882         }
1883         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1884                            i_size_read(inode));
1885         if (start >= inline_len)
1886                 goto out;
1887         if (start + len < inline_len)
1888                 inline_len = start + len;
1889         inline_len -= start;
1890
1891         error = ext4_get_inode_loc(inode, &iloc);
1892         if (error)
1893                 goto out;
1894
1895         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1896         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1897         physical += offsetof(struct ext4_inode, i_block);
1898
1899         brelse(iloc.bh);
1900 out:
1901         up_read(&EXT4_I(inode)->xattr_sem);
1902         if (physical)
1903                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1904                                                 inline_len, flags);
1905         return (error < 0 ? error : 0);
1906 }
1907
1908 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1909 {
1910         handle_t *handle;
1911         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1912         size_t i_size;
1913         void *value = NULL;
1914         struct ext4_xattr_ibody_find is = {
1915                 .s = { .not_found = -ENODATA, },
1916         };
1917         struct ext4_xattr_info i = {
1918                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1919                 .name = EXT4_XATTR_SYSTEM_DATA,
1920         };
1921
1922
1923         needed_blocks = ext4_writepage_trans_blocks(inode);
1924         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1925         if (IS_ERR(handle))
1926                 return PTR_ERR(handle);
1927
1928         ext4_write_lock_xattr(inode, &no_expand);
1929         if (!ext4_has_inline_data(inode)) {
1930                 ext4_write_unlock_xattr(inode, &no_expand);
1931                 *has_inline = 0;
1932                 ext4_journal_stop(handle);
1933                 return 0;
1934         }
1935
1936         if ((err = ext4_orphan_add(handle, inode)) != 0)
1937                 goto out;
1938
1939         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1940                 goto out;
1941
1942         down_write(&EXT4_I(inode)->i_data_sem);
1943         i_size = inode->i_size;
1944         inline_size = ext4_get_inline_size(inode);
1945         EXT4_I(inode)->i_disksize = i_size;
1946
1947         if (i_size < inline_size) {
1948                 /* Clear the content in the xattr space. */
1949                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1950                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1951                                 goto out_error;
1952
1953                         BUG_ON(is.s.not_found);
1954
1955                         value_len = le32_to_cpu(is.s.here->e_value_size);
1956                         value = kmalloc(value_len, GFP_NOFS);
1957                         if (!value) {
1958                                 err = -ENOMEM;
1959                                 goto out_error;
1960                         }
1961
1962                         err = ext4_xattr_ibody_get(inode, i.name_index,
1963                                                    i.name, value, value_len);
1964                         if (err <= 0)
1965                                 goto out_error;
1966
1967                         i.value = value;
1968                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1969                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1970                         err = ext4_xattr_ibody_inline_set(handle, inode,
1971                                                           &i, &is);
1972                         if (err)
1973                                 goto out_error;
1974                 }
1975
1976                 /* Clear the content within i_blocks. */
1977                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1978                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1979                         memset(p + i_size, 0,
1980                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1981                 }
1982
1983                 EXT4_I(inode)->i_inline_size = i_size <
1984                                         EXT4_MIN_INLINE_DATA_SIZE ?
1985                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1986         }
1987
1988 out_error:
1989         up_write(&EXT4_I(inode)->i_data_sem);
1990 out:
1991         brelse(is.iloc.bh);
1992         ext4_write_unlock_xattr(inode, &no_expand);
1993         kfree(value);
1994         if (inode->i_nlink)
1995                 ext4_orphan_del(handle, inode);
1996
1997         if (err == 0) {
1998                 inode->i_mtime = inode->i_ctime = current_time(inode);
1999                 err = ext4_mark_inode_dirty(handle, inode);
2000                 if (IS_SYNC(inode))
2001                         ext4_handle_sync(handle);
2002         }
2003         ext4_journal_stop(handle);
2004         return err;
2005 }
2006
2007 int ext4_convert_inline_data(struct inode *inode)
2008 {
2009         int error, needed_blocks, no_expand;
2010         handle_t *handle;
2011         struct ext4_iloc iloc;
2012
2013         if (!ext4_has_inline_data(inode)) {
2014                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2015                 return 0;
2016         }
2017
2018         needed_blocks = ext4_writepage_trans_blocks(inode);
2019
2020         iloc.bh = NULL;
2021         error = ext4_get_inode_loc(inode, &iloc);
2022         if (error)
2023                 return error;
2024
2025         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2026         if (IS_ERR(handle)) {
2027                 error = PTR_ERR(handle);
2028                 goto out_free;
2029         }
2030
2031         ext4_write_lock_xattr(inode, &no_expand);
2032         if (ext4_has_inline_data(inode))
2033                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2034         ext4_write_unlock_xattr(inode, &no_expand);
2035         ext4_journal_stop(handle);
2036 out_free:
2037         brelse(iloc.bh);
2038         return error;
2039 }