fs/ext4/inline.c

   1 /*
   2  * Copyright (c) 2012 Taobao.
   3  * Written by Tao Ma <boyu.mt@taobao.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/fiemap.h>
  16
  17 #include "ext4_jbd2.h"
  18 #include "ext4.h"
  19 #include "xattr.h"
  20 #include "truncate.h"
  21
  22 #define EXT4_XATTR_SYSTEM_DATA  "data"
  23 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  24 #define EXT4_INLINE_DOTDOT_OFFSET       2
  25 #define EXT4_INLINE_DOTDOT_SIZE         4
  26
  27 static int ext4_get_inline_size(struct inode *inode)
  28 {
  29         if (EXT4_I(inode)->i_inline_off)
  30                 return EXT4_I(inode)->i_inline_size;
  31
  32         return 0;
  33 }
  34
  35 static int get_max_inline_xattr_value_size(struct inode *inode,
  36                                            struct ext4_iloc *iloc)
  37 {
  38         struct ext4_xattr_ibody_header *header;
  39         struct ext4_xattr_entry *entry;
  40         struct ext4_inode *raw_inode;
  41         int free, min_offs;
  42
  43         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  44                         EXT4_GOOD_OLD_INODE_SIZE -
  45                         EXT4_I(inode)->i_extra_isize -
  46                         sizeof(struct ext4_xattr_ibody_header);
  47
  48         /*
  49          * We need to subtract another sizeof(__u32) since an in-inode xattr
  50          * needs an empty 4 bytes to indicate the gap between the xattr entry
  51          * and the name/value pair.
  52          */
  53         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  54                 return EXT4_XATTR_SIZE(min_offs -
  55                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  56                         EXT4_XATTR_ROUND - sizeof(__u32));
  57
  58         raw_inode = ext4_raw_inode(iloc);
  59         header = IHDR(inode, raw_inode);
  60         entry = IFIRST(header);
  61
  62         /* Compute min_offs. */
  63         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  64                 if (!entry->e_value_block && entry->e_value_size) {
  65                         size_t offs = le16_to_cpu(entry->e_value_offs);
  66                         if (offs < min_offs)
  67                                 min_offs = offs;
  68                 }
  69         }
  70         free = min_offs -
  71                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  72
  73         if (EXT4_I(inode)->i_inline_off) {
  74                 entry = (struct ext4_xattr_entry *)
  75                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  76
  77                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  78                 goto out;
  79         }
  80
  81         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  82
  83         if (free > EXT4_XATTR_ROUND)
  84                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  85         else
  86                 free = 0;
  87
  88 out:
  89         return free;
  90 }
  91
  92 /*
  93  * Get the maximum size we now can store in an inode.
  94  * If we can't find the space for a xattr entry, don't use the space
  95  * of the extents since we have no space to indicate the inline data.
  96  */
  97 int ext4_get_max_inline_size(struct inode *inode)
  98 {
  99         int error, max_inline_size;
 100         struct ext4_iloc iloc;
 101
 102         if (EXT4_I(inode)->i_extra_isize == 0)
 103                 return 0;
 104
 105         error = ext4_get_inode_loc(inode, &iloc);
 106         if (error) {
 107                 ext4_error_inode(inode, __func__, __LINE__, 0,
 108                                  "can't get inode location %lu",
 109                                  inode->i_ino);
 110                 return 0;
 111         }
 112
 113         down_read(&EXT4_I(inode)->xattr_sem);
 114         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 115         up_read(&EXT4_I(inode)->xattr_sem);
 116
 117         brelse(iloc.bh);
 118
 119         if (!max_inline_size)
 120                 return 0;
 121
 122         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 123 }
 124
 125 /*
 126  * this function does not take xattr_sem, which is OK because it is
 127  * currently only used in a code path coming form ext4_iget, before
 128  * the new inode has been unlocked
 129  */
 130 int ext4_find_inline_data_nolock(struct inode *inode)
 131 {
 132         struct ext4_xattr_ibody_find is = {
 133                 .s = { .not_found = -ENODATA, },
 134         };
 135         struct ext4_xattr_info i = {
 136                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 137                 .name = EXT4_XATTR_SYSTEM_DATA,
 138         };
 139         int error;
 140
 141         if (EXT4_I(inode)->i_extra_isize == 0)
 142                 return 0;
 143
 144         error = ext4_get_inode_loc(inode, &is.iloc);
 145         if (error)
 146                 return error;
 147
 148         error = ext4_xattr_ibody_find(inode, &i, &is);
 149         if (error)
 150                 goto out;
 151
 152         if (!is.s.not_found) {
 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         /*
 306          * Propagate changes to inode->i_flags as well - e.g. S_DAX may
 307          * get cleared
 308          */
 309         ext4_set_inode_flags(inode);
 310         get_bh(is.iloc.bh);
 311         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 312
 313 out:
 314         brelse(is.iloc.bh);
 315         return error;
 316 }
 317
 318 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 319                                    unsigned int len)
 320 {
 321         int error;
 322         void *value = NULL;
 323         struct ext4_xattr_ibody_find is = {
 324                 .s = { .not_found = -ENODATA, },
 325         };
 326         struct ext4_xattr_info i = {
 327                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 328                 .name = EXT4_XATTR_SYSTEM_DATA,
 329         };
 330
 331         /* If the old space is ok, write the data directly. */
 332         if (len <= EXT4_I(inode)->i_inline_size)
 333                 return 0;
 334
 335         error = ext4_get_inode_loc(inode, &is.iloc);
 336         if (error)
 337                 return error;
 338
 339         error = ext4_xattr_ibody_find(inode, &i, &is);
 340         if (error)
 341                 goto out;
 342
 343         BUG_ON(is.s.not_found);
 344
 345         len -= EXT4_MIN_INLINE_DATA_SIZE;
 346         value = kzalloc(len, GFP_NOFS);
 347         if (!value) {
 348                 error = -ENOMEM;
 349                 goto out;
 350         }
 351
 352         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 353                                      value, len);
 354         if (error == -ENODATA)
 355                 goto out;
 356
 357         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 358         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 359         if (error)
 360                 goto out;
 361
 362         /* Update the xttr entry. */
 363         i.value = value;
 364         i.value_len = len;
 365
 366         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 367         if (error)
 368                 goto out;
 369
 370         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 371                                       (void *)ext4_raw_inode(&is.iloc));
 372         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 373                                 le32_to_cpu(is.s.here->e_value_size);
 374         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 375         get_bh(is.iloc.bh);
 376         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 377
 378 out:
 379         kfree(value);
 380         brelse(is.iloc.bh);
 381         return error;
 382 }
 383
 384 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 385                                     unsigned int len)
 386 {
 387         int ret, size, no_expand;
 388         struct ext4_inode_info *ei = EXT4_I(inode);
 389
 390         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 391                 return -ENOSPC;
 392
 393         size = ext4_get_max_inline_size(inode);
 394         if (size < len)
 395                 return -ENOSPC;
 396
 397         ext4_write_lock_xattr(inode, &no_expand);
 398
 399         if (ei->i_inline_off)
 400                 ret = ext4_update_inline_data(handle, inode, len);
 401         else
 402                 ret = ext4_create_inline_data(handle, inode, len);
 403
 404         ext4_write_unlock_xattr(inode, &no_expand);
 405         return ret;
 406 }
 407
 408 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 409                                            struct inode *inode)
 410 {
 411         struct ext4_inode_info *ei = EXT4_I(inode);
 412         struct ext4_xattr_ibody_find is = {
 413                 .s = { .not_found = 0, },
 414         };
 415         struct ext4_xattr_info i = {
 416                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 417                 .name = EXT4_XATTR_SYSTEM_DATA,
 418                 .value = NULL,
 419                 .value_len = 0,
 420         };
 421         int error;
 422
 423         if (!ei->i_inline_off)
 424                 return 0;
 425
 426         error = ext4_get_inode_loc(inode, &is.iloc);
 427         if (error)
 428                 return error;
 429
 430         error = ext4_xattr_ibody_find(inode, &i, &is);
 431         if (error)
 432                 goto out;
 433
 434         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 435         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 436         if (error)
 437                 goto out;
 438
 439         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 440         if (error)
 441                 goto out;
 442
 443         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 444                 0, EXT4_MIN_INLINE_DATA_SIZE);
 445
 446         if (ext4_has_feature_extents(inode->i_sb)) {
 447                 if (S_ISDIR(inode->i_mode) ||
 448                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 449                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 450                         ext4_ext_tree_init(handle, inode);
 451                 }
 452         }
 453         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 454         /*
 455          * Propagate changes to inode->i_flags as well - e.g. S_DAX may
 456          * get set.
 457          */
 458         ext4_set_inode_flags(inode);
 459
 460         get_bh(is.iloc.bh);
 461         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 462
 463         EXT4_I(inode)->i_inline_off = 0;
 464         EXT4_I(inode)->i_inline_size = 0;
 465         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 466 out:
 467         brelse(is.iloc.bh);
 468         if (error == -ENODATA)
 469                 error = 0;
 470         return error;
 471 }
 472
 473 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 474 {
 475         void *kaddr;
 476         int ret = 0;
 477         size_t len;
 478         struct ext4_iloc iloc;
 479
 480         BUG_ON(!PageLocked(page));
 481         BUG_ON(!ext4_has_inline_data(inode));
 482         BUG_ON(page->index);
 483
 484         if (!EXT4_I(inode)->i_inline_off) {
 485                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 486                              inode->i_ino);
 487                 goto out;
 488         }
 489
 490         ret = ext4_get_inode_loc(inode, &iloc);
 491         if (ret)
 492                 goto out;
 493
 494         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 495         kaddr = kmap_atomic(page);
 496         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 497         flush_dcache_page(page);
 498         kunmap_atomic(kaddr);
 499         zero_user_segment(page, len, PAGE_SIZE);
 500         SetPageUptodate(page);
 501         brelse(iloc.bh);
 502
 503 out:
 504         return ret;
 505 }
 506
 507 int ext4_readpage_inline(struct inode *inode, struct page *page)
 508 {
 509         int ret = 0;
 510
 511         down_read(&EXT4_I(inode)->xattr_sem);
 512         if (!ext4_has_inline_data(inode)) {
 513                 up_read(&EXT4_I(inode)->xattr_sem);
 514                 return -EAGAIN;
 515         }
 516
 517         /*
 518          * Current inline data can only exist in the 1st page,
 519          * So for all the other pages, just set them uptodate.
 520          */
 521         if (!page->index)
 522                 ret = ext4_read_inline_page(inode, page);
 523         else if (!PageUptodate(page)) {
 524                 zero_user_segment(page, 0, PAGE_SIZE);
 525                 SetPageUptodate(page);
 526         }
 527
 528         up_read(&EXT4_I(inode)->xattr_sem);
 529
 530         unlock_page(page);
 531         return ret >= 0 ? 0 : ret;
 532 }
 533
 534 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 535                                               struct inode *inode,
 536                                               unsigned flags)
 537 {
 538         int ret, needed_blocks, no_expand;
 539         handle_t *handle = NULL;
 540         int retries = 0, sem_held = 0;
 541         struct page *page = NULL;
 542         unsigned from, to;
 543         struct ext4_iloc iloc;
 544
 545         if (!ext4_has_inline_data(inode)) {
 546                 /*
 547                  * clear the flag so that no new write
 548                  * will trap here again.
 549                  */
 550                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 551                 return 0;
 552         }
 553
 554         needed_blocks = ext4_writepage_trans_blocks(inode);
 555
 556         ret = ext4_get_inode_loc(inode, &iloc);
 557         if (ret)
 558                 return ret;
 559
 560 retry:
 561         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 562         if (IS_ERR(handle)) {
 563                 ret = PTR_ERR(handle);
 564                 handle = NULL;
 565                 goto out;
 566         }
 567
 568         /* We cannot recurse into the filesystem as the transaction is already
 569          * started */
 570         flags |= AOP_FLAG_NOFS;
 571
 572         page = grab_cache_page_write_begin(mapping, 0, flags);
 573         if (!page) {
 574                 ret = -ENOMEM;
 575                 goto out;
 576         }
 577
 578         ext4_write_lock_xattr(inode, &no_expand);
 579         sem_held = 1;
 580         /* If some one has already done this for us, just exit. */
 581         if (!ext4_has_inline_data(inode)) {
 582                 ret = 0;
 583                 goto out;
 584         }
 585
 586         from = 0;
 587         to = ext4_get_inline_size(inode);
 588         if (!PageUptodate(page)) {
 589                 ret = ext4_read_inline_page(inode, page);
 590                 if (ret < 0)
 591                         goto out;
 592         }
 593
 594         ret = ext4_destroy_inline_data_nolock(handle, inode);
 595         if (ret)
 596                 goto out;
 597
 598         if (ext4_should_dioread_nolock(inode)) {
 599                 ret = __block_write_begin(page, from, to,
 600                                           ext4_get_block_unwritten);
 601         } else
 602                 ret = __block_write_begin(page, from, to, ext4_get_block);
 603
 604         if (!ret && ext4_should_journal_data(inode)) {
 605                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 606                                              from, to, NULL,
 607                                              do_journal_get_write_access);
 608         }
 609
 610         if (ret) {
 611                 unlock_page(page);
 612                 put_page(page);
 613                 page = NULL;
 614                 ext4_orphan_add(handle, inode);
 615                 ext4_write_unlock_xattr(inode, &no_expand);
 616                 sem_held = 0;
 617                 ext4_journal_stop(handle);
 618                 handle = NULL;
 619                 ext4_truncate_failed_write(inode);
 620                 /*
 621                  * If truncate failed early the inode might
 622                  * still be on the orphan list; we need to
 623                  * make sure the inode is removed from the
 624                  * orphan list in that case.
 625                  */
 626                 if (inode->i_nlink)
 627                         ext4_orphan_del(NULL, inode);
 628         }
 629
 630         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 631                 goto retry;
 632
 633         if (page)
 634                 block_commit_write(page, from, to);
 635 out:
 636         if (page) {
 637                 unlock_page(page);
 638                 put_page(page);
 639         }
 640         if (sem_held)
 641                 ext4_write_unlock_xattr(inode, &no_expand);
 642         if (handle)
 643                 ext4_journal_stop(handle);
 644         brelse(iloc.bh);
 645         return ret;
 646 }
 647
 648 /*
 649  * Try to write data in the inode.
 650  * If the inode has inline data, check whether the new write can be
 651  * in the inode also. If not, create the page the handle, move the data
 652  * to the page make it update and let the later codes create extent for it.
 653  */
 654 int ext4_try_to_write_inline_data(struct address_space *mapping,
 655                                   struct inode *inode,
 656                                   loff_t pos, unsigned len,
 657                                   unsigned flags,
 658                                   struct page **pagep)
 659 {
 660         int ret;
 661         handle_t *handle;
 662         struct page *page;
 663         struct ext4_iloc iloc;
 664
 665         if (pos + len > ext4_get_max_inline_size(inode))
 666                 goto convert;
 667
 668         ret = ext4_get_inode_loc(inode, &iloc);
 669         if (ret)
 670                 return ret;
 671
 672         /*
 673          * The possible write could happen in the inode,
 674          * so try to reserve the space in inode first.
 675          */
 676         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 677         if (IS_ERR(handle)) {
 678                 ret = PTR_ERR(handle);
 679                 handle = NULL;
 680                 goto out;
 681         }
 682
 683         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 684         if (ret && ret != -ENOSPC)
 685                 goto out;
 686
 687         /* We don't have space in inline inode, so convert it to extent. */
 688         if (ret == -ENOSPC) {
 689                 ext4_journal_stop(handle);
 690                 brelse(iloc.bh);
 691                 goto convert;
 692         }
 693
 694         flags |= AOP_FLAG_NOFS;
 695
 696         page = grab_cache_page_write_begin(mapping, 0, flags);
 697         if (!page) {
 698                 ret = -ENOMEM;
 699                 goto out;
 700         }
 701
 702         *pagep = page;
 703         down_read(&EXT4_I(inode)->xattr_sem);
 704         if (!ext4_has_inline_data(inode)) {
 705                 ret = 0;
 706                 unlock_page(page);
 707                 put_page(page);
 708                 goto out_up_read;
 709         }
 710
 711         if (!PageUptodate(page)) {
 712                 ret = ext4_read_inline_page(inode, page);
 713                 if (ret < 0)
 714                         goto out_up_read;
 715         }
 716
 717         ret = 1;
 718         handle = NULL;
 719 out_up_read:
 720         up_read(&EXT4_I(inode)->xattr_sem);
 721 out:
 722         if (handle)
 723                 ext4_journal_stop(handle);
 724         brelse(iloc.bh);
 725         return ret;
 726 convert:
 727         return ext4_convert_inline_data_to_extent(mapping,
 728                                                   inode, flags);
 729 }
 730
 731 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 732                                unsigned copied, struct page *page)
 733 {
 734         int ret, no_expand;
 735         void *kaddr;
 736         struct ext4_iloc iloc;
 737
 738         if (unlikely(copied < len)) {
 739                 if (!PageUptodate(page)) {
 740                         copied = 0;
 741                         goto out;
 742                 }
 743         }
 744
 745         ret = ext4_get_inode_loc(inode, &iloc);
 746         if (ret) {
 747                 ext4_std_error(inode->i_sb, ret);
 748                 copied = 0;
 749                 goto out;
 750         }
 751
 752         ext4_write_lock_xattr(inode, &no_expand);
 753         BUG_ON(!ext4_has_inline_data(inode));
 754
 755         kaddr = kmap_atomic(page);
 756         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 757         kunmap_atomic(kaddr);
 758         SetPageUptodate(page);
 759         /* clear page dirty so that writepages wouldn't work for us. */
 760         ClearPageDirty(page);
 761
 762         ext4_write_unlock_xattr(inode, &no_expand);
 763         brelse(iloc.bh);
 764 out:
 765         return copied;
 766 }
 767
 768 struct buffer_head *
 769 ext4_journalled_write_inline_data(struct inode *inode,
 770                                   unsigned len,
 771                                   struct page *page)
 772 {
 773         int ret, no_expand;
 774         void *kaddr;
 775         struct ext4_iloc iloc;
 776
 777         ret = ext4_get_inode_loc(inode, &iloc);
 778         if (ret) {
 779                 ext4_std_error(inode->i_sb, ret);
 780                 return NULL;
 781         }
 782
 783         ext4_write_lock_xattr(inode, &no_expand);
 784         kaddr = kmap_atomic(page);
 785         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 786         kunmap_atomic(kaddr);
 787         ext4_write_unlock_xattr(inode, &no_expand);
 788
 789         return iloc.bh;
 790 }
 791
 792 /*
 793  * Try to make the page cache and handle ready for the inline data case.
 794  * We can call this function in 2 cases:
 795  * 1. The inode is created and the first write exceeds inline size. We can
 796  *    clear the inode state safely.
 797  * 2. The inode has inline data, then we need to read the data, make it
 798  *    update and dirty so that ext4_da_writepages can handle it. We don't
 799  *    need to start the journal since the file's metatdata isn't changed now.
 800  */
 801 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 802                                                  struct inode *inode,
 803                                                  unsigned flags,
 804                                                  void **fsdata)
 805 {
 806         int ret = 0, inline_size;
 807         struct page *page;
 808
 809         page = grab_cache_page_write_begin(mapping, 0, flags);
 810         if (!page)
 811                 return -ENOMEM;
 812
 813         down_read(&EXT4_I(inode)->xattr_sem);
 814         if (!ext4_has_inline_data(inode)) {
 815                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 816                 goto out;
 817         }
 818
 819         inline_size = ext4_get_inline_size(inode);
 820
 821         if (!PageUptodate(page)) {
 822                 ret = ext4_read_inline_page(inode, page);
 823                 if (ret < 0)
 824                         goto out;
 825         }
 826
 827         ret = __block_write_begin(page, 0, inline_size,
 828                                   ext4_da_get_block_prep);
 829         if (ret) {
 830                 up_read(&EXT4_I(inode)->xattr_sem);
 831                 unlock_page(page);
 832                 put_page(page);
 833                 ext4_truncate_failed_write(inode);
 834                 return ret;
 835         }
 836
 837         SetPageDirty(page);
 838         SetPageUptodate(page);
 839         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 840         *fsdata = (void *)CONVERT_INLINE_DATA;
 841
 842 out:
 843         up_read(&EXT4_I(inode)->xattr_sem);
 844         if (page) {
 845                 unlock_page(page);
 846                 put_page(page);
 847         }
 848         return ret;
 849 }
 850
 851 /*
 852  * Prepare the write for the inline data.
 853  * If the the data can be written into the inode, we just read
 854  * the page and make it uptodate, and start the journal.
 855  * Otherwise read the page, makes it dirty so that it can be
 856  * handle in writepages(the i_disksize update is left to the
 857  * normal ext4_da_write_end).
 858  */
 859 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 860                                     struct inode *inode,
 861                                     loff_t pos, unsigned len,
 862                                     unsigned flags,
 863                                     struct page **pagep,
 864                                     void **fsdata)
 865 {
 866         int ret, inline_size;
 867         handle_t *handle;
 868         struct page *page;
 869         struct ext4_iloc iloc;
 870         int retries;
 871
 872         ret = ext4_get_inode_loc(inode, &iloc);
 873         if (ret)
 874                 return ret;
 875
 876 retry_journal:
 877         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 878         if (IS_ERR(handle)) {
 879                 ret = PTR_ERR(handle);
 880                 goto out;
 881         }
 882
 883         inline_size = ext4_get_max_inline_size(inode);
 884
 885         ret = -ENOSPC;
 886         if (inline_size >= pos + len) {
 887                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 888                 if (ret && ret != -ENOSPC)
 889                         goto out_journal;
 890         }
 891
 892         /*
 893          * We cannot recurse into the filesystem as the transaction
 894          * is already started.
 895          */
 896         flags |= AOP_FLAG_NOFS;
 897
 898         if (ret == -ENOSPC) {
 899                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 900                                                             inode,
 901                                                             flags,
 902                                                             fsdata);
 903                 ext4_journal_stop(handle);
 904                 if (ret == -ENOSPC &&
 905                     ext4_should_retry_alloc(inode->i_sb, &retries))
 906                         goto retry_journal;
 907                 goto out;
 908         }
 909
 910
 911         page = grab_cache_page_write_begin(mapping, 0, flags);
 912         if (!page) {
 913                 ret = -ENOMEM;
 914                 goto out_journal;
 915         }
 916
 917         down_read(&EXT4_I(inode)->xattr_sem);
 918         if (!ext4_has_inline_data(inode)) {
 919                 ret = 0;
 920                 goto out_release_page;
 921         }
 922
 923         if (!PageUptodate(page)) {
 924                 ret = ext4_read_inline_page(inode, page);
 925                 if (ret < 0)
 926                         goto out_release_page;
 927         }
 928
 929         up_read(&EXT4_I(inode)->xattr_sem);
 930         *pagep = page;
 931         brelse(iloc.bh);
 932         return 1;
 933 out_release_page:
 934         up_read(&EXT4_I(inode)->xattr_sem);
 935         unlock_page(page);
 936         put_page(page);
 937 out_journal:
 938         ext4_journal_stop(handle);
 939 out:
 940         brelse(iloc.bh);
 941         return ret;
 942 }
 943
 944 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 945                                   unsigned len, unsigned copied,
 946                                   struct page *page)
 947 {
 948         int i_size_changed = 0;
 949         int ret;
 950
 951         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 952         if (ret < 0) {
 953                 unlock_page(page);
 954                 put_page(page);
 955                 return ret;
 956         }
 957         copied = ret;
 958
 959         /*
 960          * No need to use i_size_read() here, the i_size
 961          * cannot change under us because we hold i_mutex.
 962          *
 963          * But it's important to update i_size while still holding page lock:
 964          * page writeout could otherwise come in and zero beyond i_size.
 965          */
 966         if (pos+copied > inode->i_size) {
 967                 i_size_write(inode, pos+copied);
 968                 i_size_changed = 1;
 969         }
 970         unlock_page(page);
 971         put_page(page);
 972
 973         /*
 974          * Don't mark the inode dirty under page lock. First, it unnecessarily
 975          * makes the holding time of page lock longer. Second, it forces lock
 976          * ordering of page lock and transaction start for journaling
 977          * filesystems.
 978          */
 979         if (i_size_changed)
 980                 mark_inode_dirty(inode);
 981
 982         return copied;
 983 }
 984
 985 #ifdef INLINE_DIR_DEBUG
 986 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 987                           void *inline_start, int inline_size)
 988 {
 989         int offset;
 990         unsigned short de_len;
 991         struct ext4_dir_entry_2 *de = inline_start;
 992         void *dlimit = inline_start + inline_size;
 993
 994         trace_printk("inode %lu\n", dir->i_ino);
 995         offset = 0;
 996         while ((void *)de < dlimit) {
 997                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 998                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 999                              offset, de_len, de->name_len, de->name,
1000                              de->name_len, le32_to_cpu(de->inode));
1001                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1002                                          inline_start, inline_size, offset))
1003                         BUG();
1004
1005                 offset += de_len;
1006                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1007         }
1008 }
1009 #else
1010 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1011 #endif
1012
1013 /*
1014  * Add a new entry into a inline dir.
1015  * It will return -ENOSPC if no space is available, and -EIO
1016  * and -EEXIST if directory entry already exists.
1017  */
1018 static int ext4_add_dirent_to_inline(handle_t *handle,
1019                                      struct ext4_filename *fname,
1020                                      struct inode *dir,
1021                                      struct inode *inode,
1022                                      struct ext4_iloc *iloc,
1023                                      void *inline_start, int inline_size)
1024 {
1025         int             err;
1026         struct ext4_dir_entry_2 *de;
1027
1028         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1029                                 inline_size, fname, &de);
1030         if (err)
1031                 return err;
1032
1033         BUFFER_TRACE(iloc->bh, "get_write_access");
1034         err = ext4_journal_get_write_access(handle, iloc->bh);
1035         if (err)
1036                 return err;
1037         ext4_insert_dentry(inode, de, inline_size, fname);
1038
1039         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1040
1041         /*
1042          * XXX shouldn't update any times until successful
1043          * completion of syscall, but too many callers depend
1044          * on this.
1045          *
1046          * XXX similarly, too many callers depend on
1047          * ext4_new_inode() setting the times, but error
1048          * recovery deletes the inode, so the worst that can
1049          * happen is that the times are slightly out of date
1050          * and/or different from the directory change time.
1051          */
1052         dir->i_mtime = dir->i_ctime = current_time(dir);
1053         ext4_update_dx_flag(dir);
1054         dir->i_version++;
1055         return 1;
1056 }
1057
1058 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1059                                        struct ext4_iloc *iloc)
1060 {
1061         struct ext4_xattr_entry *entry;
1062         struct ext4_xattr_ibody_header *header;
1063
1064         BUG_ON(!EXT4_I(inode)->i_inline_off);
1065
1066         header = IHDR(inode, ext4_raw_inode(iloc));
1067         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1068                                             EXT4_I(inode)->i_inline_off);
1069
1070         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1071 }
1072
1073 /* Set the final de to cover the whole block. */
1074 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1075 {
1076         struct ext4_dir_entry_2 *de, *prev_de;
1077         void *limit;
1078         int de_len;
1079
1080         de = (struct ext4_dir_entry_2 *)de_buf;
1081         if (old_size) {
1082                 limit = de_buf + old_size;
1083                 do {
1084                         prev_de = de;
1085                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1086                         de_buf += de_len;
1087                         de = (struct ext4_dir_entry_2 *)de_buf;
1088                 } while (de_buf < limit);
1089
1090                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1091                                                         old_size, new_size);
1092         } else {
1093                 /* this is just created, so create an empty entry. */
1094                 de->inode = 0;
1095                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1096         }
1097 }
1098
1099 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1100                                   struct ext4_iloc *iloc)
1101 {
1102         int ret;
1103         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1104         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1105
1106         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1107                 return -ENOSPC;
1108
1109         ret = ext4_update_inline_data(handle, dir,
1110                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1111         if (ret)
1112                 return ret;
1113
1114         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1115                              EXT4_I(dir)->i_inline_size -
1116                                                 EXT4_MIN_INLINE_DATA_SIZE);
1117         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1118         return 0;
1119 }
1120
1121 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1122                                      struct ext4_iloc *iloc,
1123                                      void *buf, int inline_size)
1124 {
1125         ext4_create_inline_data(handle, inode, inline_size);
1126         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1127         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1128 }
1129
1130 static int ext4_finish_convert_inline_dir(handle_t *handle,
1131                                           struct inode *inode,
1132                                           struct buffer_head *dir_block,
1133                                           void *buf,
1134                                           int inline_size)
1135 {
1136         int err, csum_size = 0, header_size = 0;
1137         struct ext4_dir_entry_2 *de;
1138         struct ext4_dir_entry_tail *t;
1139         void *target = dir_block->b_data;
1140
1141         /*
1142          * First create "." and ".." and then copy the dir information
1143          * back to the block.
1144          */
1145         de = (struct ext4_dir_entry_2 *)target;
1146         de = ext4_init_dot_dotdot(inode, de,
1147                 inode->i_sb->s_blocksize, csum_size,
1148                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1149         header_size = (void *)de - target;
1150
1151         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1152                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1153
1154         if (ext4_has_metadata_csum(inode->i_sb))
1155                 csum_size = sizeof(struct ext4_dir_entry_tail);
1156
1157         inode->i_size = inode->i_sb->s_blocksize;
1158         i_size_write(inode, inode->i_sb->s_blocksize);
1159         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1160         ext4_update_final_de(dir_block->b_data,
1161                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1162                         inode->i_sb->s_blocksize - csum_size);
1163
1164         if (csum_size) {
1165                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1166                                      inode->i_sb->s_blocksize);
1167                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1168         }
1169         set_buffer_uptodate(dir_block);
1170         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1171         if (err)
1172                 return err;
1173         set_buffer_verified(dir_block);
1174         return ext4_mark_inode_dirty(handle, inode);
1175 }
1176
1177 static int ext4_convert_inline_data_nolock(handle_t *handle,
1178                                            struct inode *inode,
1179                                            struct ext4_iloc *iloc)
1180 {
1181         int error;
1182         void *buf = NULL;
1183         struct buffer_head *data_bh = NULL;
1184         struct ext4_map_blocks map;
1185         int inline_size;
1186
1187         inline_size = ext4_get_inline_size(inode);
1188         buf = kmalloc(inline_size, GFP_NOFS);
1189         if (!buf) {
1190                 error = -ENOMEM;
1191                 goto out;
1192         }
1193
1194         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1195         if (error < 0)
1196                 goto out;
1197
1198         /*
1199          * Make sure the inline directory entries pass checks before we try to
1200          * convert them, so that we avoid touching stuff that needs fsck.
1201          */
1202         if (S_ISDIR(inode->i_mode)) {
1203                 error = ext4_check_all_de(inode, iloc->bh,
1204                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1205                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1206                 if (error)
1207                         goto out;
1208         }
1209
1210         error = ext4_destroy_inline_data_nolock(handle, inode);
1211         if (error)
1212                 goto out;
1213
1214         map.m_lblk = 0;
1215         map.m_len = 1;
1216         map.m_flags = 0;
1217         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1218         if (error < 0)
1219                 goto out_restore;
1220         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1221                 error = -EIO;
1222                 goto out_restore;
1223         }
1224
1225         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1226         if (!data_bh) {
1227                 error = -ENOMEM;
1228                 goto out_restore;
1229         }
1230
1231         lock_buffer(data_bh);
1232         error = ext4_journal_get_create_access(handle, data_bh);
1233         if (error) {
1234                 unlock_buffer(data_bh);
1235                 error = -EIO;
1236                 goto out_restore;
1237         }
1238         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1239
1240         if (!S_ISDIR(inode->i_mode)) {
1241                 memcpy(data_bh->b_data, buf, inline_size);
1242                 set_buffer_uptodate(data_bh);
1243                 error = ext4_handle_dirty_metadata(handle,
1244                                                    inode, data_bh);
1245         } else {
1246                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1247                                                        buf, inline_size);
1248         }
1249
1250         unlock_buffer(data_bh);
1251 out_restore:
1252         if (error)
1253                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1254
1255 out:
1256         brelse(data_bh);
1257         kfree(buf);
1258         return error;
1259 }
1260
1261 /*
1262  * Try to add the new entry to the inline data.
1263  * If succeeds, return 0. If not, extended the inline dir and copied data to
1264  * the new created block.
1265  */
1266 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1267                               struct inode *dir, struct inode *inode)
1268 {
1269         int ret, inline_size, no_expand;
1270         void *inline_start;
1271         struct ext4_iloc iloc;
1272
1273         ret = ext4_get_inode_loc(dir, &iloc);
1274         if (ret)
1275                 return ret;
1276
1277         ext4_write_lock_xattr(dir, &no_expand);
1278         if (!ext4_has_inline_data(dir))
1279                 goto out;
1280
1281         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1282                                                  EXT4_INLINE_DOTDOT_SIZE;
1283         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1284
1285         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1286                                         inline_start, inline_size);
1287         if (ret != -ENOSPC)
1288                 goto out;
1289
1290         /* check whether it can be inserted to inline xattr space. */
1291         inline_size = EXT4_I(dir)->i_inline_size -
1292                         EXT4_MIN_INLINE_DATA_SIZE;
1293         if (!inline_size) {
1294                 /* Try to use the xattr space.*/
1295                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1296                 if (ret && ret != -ENOSPC)
1297                         goto out;
1298
1299                 inline_size = EXT4_I(dir)->i_inline_size -
1300                                 EXT4_MIN_INLINE_DATA_SIZE;
1301         }
1302
1303         if (inline_size) {
1304                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1305
1306                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1307                                                 inode, &iloc, inline_start,
1308                                                 inline_size);
1309
1310                 if (ret != -ENOSPC)
1311                         goto out;
1312         }
1313
1314         /*
1315          * The inline space is filled up, so create a new block for it.
1316          * As the extent tree will be created, we have to save the inline
1317          * dir first.
1318          */
1319         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1320
1321 out:
1322         ext4_write_unlock_xattr(dir, &no_expand);
1323         ext4_mark_inode_dirty(handle, dir);
1324         brelse(iloc.bh);
1325         return ret;
1326 }
1327
1328 /*
1329  * This function fills a red-black tree with information from an
1330  * inlined dir.  It returns the number directory entries loaded
1331  * into the tree.  If there is an error it is returned in err.
1332  */
1333 int htree_inlinedir_to_tree(struct file *dir_file,
1334                             struct inode *dir, ext4_lblk_t block,
1335                             struct dx_hash_info *hinfo,
1336                             __u32 start_hash, __u32 start_minor_hash,
1337                             int *has_inline_data)
1338 {
1339         int err = 0, count = 0;
1340         unsigned int parent_ino;
1341         int pos;
1342         struct ext4_dir_entry_2 *de;
1343         struct inode *inode = file_inode(dir_file);
1344         int ret, inline_size = 0;
1345         struct ext4_iloc iloc;
1346         void *dir_buf = NULL;
1347         struct ext4_dir_entry_2 fake;
1348         struct fscrypt_str tmp_str;
1349
1350         ret = ext4_get_inode_loc(inode, &iloc);
1351         if (ret)
1352                 return ret;
1353
1354         down_read(&EXT4_I(inode)->xattr_sem);
1355         if (!ext4_has_inline_data(inode)) {
1356                 up_read(&EXT4_I(inode)->xattr_sem);
1357                 *has_inline_data = 0;
1358                 goto out;
1359         }
1360
1361         inline_size = ext4_get_inline_size(inode);
1362         dir_buf = kmalloc(inline_size, GFP_NOFS);
1363         if (!dir_buf) {
1364                 ret = -ENOMEM;
1365                 up_read(&EXT4_I(inode)->xattr_sem);
1366                 goto out;
1367         }
1368
1369         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1370         up_read(&EXT4_I(inode)->xattr_sem);
1371         if (ret < 0)
1372                 goto out;
1373
1374         pos = 0;
1375         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1376         while (pos < inline_size) {
1377                 /*
1378                  * As inlined dir doesn't store any information about '.' and
1379                  * only the inode number of '..' is stored, we have to handle
1380                  * them differently.
1381                  */
1382                 if (pos == 0) {
1383                         fake.inode = cpu_to_le32(inode->i_ino);
1384                         fake.name_len = 1;
1385                         strcpy(fake.name, ".");
1386                         fake.rec_len = ext4_rec_len_to_disk(
1387                                                 EXT4_DIR_REC_LEN(fake.name_len),
1388                                                 inline_size);
1389                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1390                         de = &fake;
1391                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1392                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1393                         fake.inode = cpu_to_le32(parent_ino);
1394                         fake.name_len = 2;
1395                         strcpy(fake.name, "..");
1396                         fake.rec_len = ext4_rec_len_to_disk(
1397                                                 EXT4_DIR_REC_LEN(fake.name_len),
1398                                                 inline_size);
1399                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1400                         de = &fake;
1401                         pos = EXT4_INLINE_DOTDOT_SIZE;
1402                 } else {
1403                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1404                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1405                         if (ext4_check_dir_entry(inode, dir_file, de,
1406                                          iloc.bh, dir_buf,
1407                                          inline_size, pos)) {
1408                                 ret = count;
1409                                 goto out;
1410                         }
1411                 }
1412
1413                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1414                 if ((hinfo->hash < start_hash) ||
1415                     ((hinfo->hash == start_hash) &&
1416                      (hinfo->minor_hash < start_minor_hash)))
1417                         continue;
1418                 if (de->inode == 0)
1419                         continue;
1420                 tmp_str.name = de->name;
1421                 tmp_str.len = de->name_len;
1422                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1423                                               hinfo->minor_hash, de, &tmp_str);
1424                 if (err) {
1425                         count = err;
1426                         goto out;
1427                 }
1428                 count++;
1429         }
1430         ret = count;
1431 out:
1432         kfree(dir_buf);
1433         brelse(iloc.bh);
1434         return ret;
1435 }
1436
1437 /*
1438  * So this function is called when the volume is mkfsed with
1439  * dir_index disabled. In order to keep f_pos persistent
1440  * after we convert from an inlined dir to a blocked based,
1441  * we just pretend that we are a normal dir and return the
1442  * offset as if '.' and '..' really take place.
1443  *
1444  */
1445 int ext4_read_inline_dir(struct file *file,
1446                          struct dir_context *ctx,
1447                          int *has_inline_data)
1448 {
1449         unsigned int offset, parent_ino;
1450         int i;
1451         struct ext4_dir_entry_2 *de;
1452         struct super_block *sb;
1453         struct inode *inode = file_inode(file);
1454         int ret, inline_size = 0;
1455         struct ext4_iloc iloc;
1456         void *dir_buf = NULL;
1457         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1458
1459         ret = ext4_get_inode_loc(inode, &iloc);
1460         if (ret)
1461                 return ret;
1462
1463         down_read(&EXT4_I(inode)->xattr_sem);
1464         if (!ext4_has_inline_data(inode)) {
1465                 up_read(&EXT4_I(inode)->xattr_sem);
1466                 *has_inline_data = 0;
1467                 goto out;
1468         }
1469
1470         inline_size = ext4_get_inline_size(inode);
1471         dir_buf = kmalloc(inline_size, GFP_NOFS);
1472         if (!dir_buf) {
1473                 ret = -ENOMEM;
1474                 up_read(&EXT4_I(inode)->xattr_sem);
1475                 goto out;
1476         }
1477
1478         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1479         up_read(&EXT4_I(inode)->xattr_sem);
1480         if (ret < 0)
1481                 goto out;
1482
1483         ret = 0;
1484         sb = inode->i_sb;
1485         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1486         offset = ctx->pos;
1487
1488         /*
1489          * dotdot_offset and dotdot_size is the real offset and
1490          * size for ".." and "." if the dir is block based while
1491          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1492          * So we will use extra_offset and extra_size to indicate them
1493          * during the inline dir iteration.
1494          */
1495         dotdot_offset = EXT4_DIR_REC_LEN(1);
1496         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1497         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1498         extra_size = extra_offset + inline_size;
1499
1500         /*
1501          * If the version has changed since the last call to
1502          * readdir(2), then we might be pointing to an invalid
1503          * dirent right now.  Scan from the start of the inline
1504          * dir to make sure.
1505          */
1506         if (file->f_version != inode->i_version) {
1507                 for (i = 0; i < extra_size && i < offset;) {
1508                         /*
1509                          * "." is with offset 0 and
1510                          * ".." is dotdot_offset.
1511                          */
1512                         if (!i) {
1513                                 i = dotdot_offset;
1514                                 continue;
1515                         } else if (i == dotdot_offset) {
1516                                 i = dotdot_size;
1517                                 continue;
1518                         }
1519                         /* for other entry, the real offset in
1520                          * the buf has to be tuned accordingly.
1521                          */
1522                         de = (struct ext4_dir_entry_2 *)
1523                                 (dir_buf + i - extra_offset);
1524                         /* It's too expensive to do a full
1525                          * dirent test each time round this
1526                          * loop, but we do have to test at
1527                          * least that it is non-zero.  A
1528                          * failure will be detected in the
1529                          * dirent test below. */
1530                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1531                                 < EXT4_DIR_REC_LEN(1))
1532                                 break;
1533                         i += ext4_rec_len_from_disk(de->rec_len,
1534                                                     extra_size);
1535                 }
1536                 offset = i;
1537                 ctx->pos = offset;
1538                 file->f_version = inode->i_version;
1539         }
1540
1541         while (ctx->pos < extra_size) {
1542                 if (ctx->pos == 0) {
1543                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1544                                 goto out;
1545                         ctx->pos = dotdot_offset;
1546                         continue;
1547                 }
1548
1549                 if (ctx->pos == dotdot_offset) {
1550                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1551                                 goto out;
1552                         ctx->pos = dotdot_size;
1553                         continue;
1554                 }
1555
1556                 de = (struct ext4_dir_entry_2 *)
1557                         (dir_buf + ctx->pos - extra_offset);
1558                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1559                                          extra_size, ctx->pos))
1560                         goto out;
1561                 if (le32_to_cpu(de->inode)) {
1562                         if (!dir_emit(ctx, de->name, de->name_len,
1563                                       le32_to_cpu(de->inode),
1564                                       get_dtype(sb, de->file_type)))
1565                                 goto out;
1566                 }
1567                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1568         }
1569 out:
1570         kfree(dir_buf);
1571         brelse(iloc.bh);
1572         return ret;
1573 }
1574
1575 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1576                                         struct ext4_dir_entry_2 **parent_de,
1577                                         int *retval)
1578 {
1579         struct ext4_iloc iloc;
1580
1581         *retval = ext4_get_inode_loc(inode, &iloc);
1582         if (*retval)
1583                 return NULL;
1584
1585         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1586
1587         return iloc.bh;
1588 }
1589
1590 /*
1591  * Try to create the inline data for the new dir.
1592  * If it succeeds, return 0, otherwise return the error.
1593  * In case of ENOSPC, the caller should create the normal disk layout dir.
1594  */
1595 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1596                                struct inode *inode)
1597 {
1598         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1599         struct ext4_iloc iloc;
1600         struct ext4_dir_entry_2 *de;
1601
1602         ret = ext4_get_inode_loc(inode, &iloc);
1603         if (ret)
1604                 return ret;
1605
1606         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1607         if (ret)
1608                 goto out;
1609
1610         /*
1611          * For inline dir, we only save the inode information for the ".."
1612          * and create a fake dentry to cover the left space.
1613          */
1614         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1615         de->inode = cpu_to_le32(parent->i_ino);
1616         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1617         de->inode = 0;
1618         de->rec_len = ext4_rec_len_to_disk(
1619                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1620                                 inline_size);
1621         set_nlink(inode, 2);
1622         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1623 out:
1624         brelse(iloc.bh);
1625         return ret;
1626 }
1627
1628 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1629                                         struct ext4_filename *fname,
1630                                         struct ext4_dir_entry_2 **res_dir,
1631                                         int *has_inline_data)
1632 {
1633         int ret;
1634         struct ext4_iloc iloc;
1635         void *inline_start;
1636         int inline_size;
1637
1638         if (ext4_get_inode_loc(dir, &iloc))
1639                 return NULL;
1640
1641         down_read(&EXT4_I(dir)->xattr_sem);
1642         if (!ext4_has_inline_data(dir)) {
1643                 *has_inline_data = 0;
1644                 goto out;
1645         }
1646
1647         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1648                                                 EXT4_INLINE_DOTDOT_SIZE;
1649         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1650         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1651                               dir, fname, 0, res_dir);
1652         if (ret == 1)
1653                 goto out_find;
1654         if (ret < 0)
1655                 goto out;
1656
1657         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1658                 goto out;
1659
1660         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1661         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1662
1663         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1664                               dir, fname, 0, res_dir);
1665         if (ret == 1)
1666                 goto out_find;
1667
1668 out:
1669         brelse(iloc.bh);
1670         iloc.bh = NULL;
1671 out_find:
1672         up_read(&EXT4_I(dir)->xattr_sem);
1673         return iloc.bh;
1674 }
1675
1676 int ext4_delete_inline_entry(handle_t *handle,
1677                              struct inode *dir,
1678                              struct ext4_dir_entry_2 *de_del,
1679                              struct buffer_head *bh,
1680                              int *has_inline_data)
1681 {
1682         int err, inline_size, no_expand;
1683         struct ext4_iloc iloc;
1684         void *inline_start;
1685
1686         err = ext4_get_inode_loc(dir, &iloc);
1687         if (err)
1688                 return err;
1689
1690         ext4_write_lock_xattr(dir, &no_expand);
1691         if (!ext4_has_inline_data(dir)) {
1692                 *has_inline_data = 0;
1693                 goto out;
1694         }
1695
1696         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1697                 EXT4_MIN_INLINE_DATA_SIZE) {
1698                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1699                                         EXT4_INLINE_DOTDOT_SIZE;
1700                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1701                                 EXT4_INLINE_DOTDOT_SIZE;
1702         } else {
1703                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1704                 inline_size = ext4_get_inline_size(dir) -
1705                                 EXT4_MIN_INLINE_DATA_SIZE;
1706         }
1707
1708         BUFFER_TRACE(bh, "get_write_access");
1709         err = ext4_journal_get_write_access(handle, bh);
1710         if (err)
1711                 goto out;
1712
1713         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1714                                         inline_start, inline_size, 0);
1715         if (err)
1716                 goto out;
1717
1718         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1719 out:
1720         ext4_write_unlock_xattr(dir, &no_expand);
1721         if (likely(err == 0))
1722                 err = ext4_mark_inode_dirty(handle, dir);
1723         brelse(iloc.bh);
1724         if (err != -ENOENT)
1725                 ext4_std_error(dir->i_sb, err);
1726         return err;
1727 }
1728
1729 /*
1730  * Get the inline dentry at offset.
1731  */
1732 static inline struct ext4_dir_entry_2 *
1733 ext4_get_inline_entry(struct inode *inode,
1734                       struct ext4_iloc *iloc,
1735                       unsigned int offset,
1736                       void **inline_start,
1737                       int *inline_size)
1738 {
1739         void *inline_pos;
1740
1741         BUG_ON(offset > ext4_get_inline_size(inode));
1742
1743         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1744                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1745                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1746         } else {
1747                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1748                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1749                 *inline_size = ext4_get_inline_size(inode) -
1750                                 EXT4_MIN_INLINE_DATA_SIZE;
1751         }
1752
1753         if (inline_start)
1754                 *inline_start = inline_pos;
1755         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1756 }
1757
1758 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1759 {
1760         int err, inline_size;
1761         struct ext4_iloc iloc;
1762         void *inline_pos;
1763         unsigned int offset;
1764         struct ext4_dir_entry_2 *de;
1765         bool ret = true;
1766
1767         err = ext4_get_inode_loc(dir, &iloc);
1768         if (err) {
1769                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1770                                  err, dir->i_ino);
1771                 return true;
1772         }
1773
1774         down_read(&EXT4_I(dir)->xattr_sem);
1775         if (!ext4_has_inline_data(dir)) {
1776                 *has_inline_data = 0;
1777                 goto out;
1778         }
1779
1780         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1781         if (!le32_to_cpu(de->inode)) {
1782                 ext4_warning(dir->i_sb,
1783                              "bad inline directory (dir #%lu) - no `..'",
1784                              dir->i_ino);
1785                 ret = true;
1786                 goto out;
1787         }
1788
1789         offset = EXT4_INLINE_DOTDOT_SIZE;
1790         while (offset < dir->i_size) {
1791                 de = ext4_get_inline_entry(dir, &iloc, offset,
1792                                            &inline_pos, &inline_size);
1793                 if (ext4_check_dir_entry(dir, NULL, de,
1794                                          iloc.bh, inline_pos,
1795                                          inline_size, offset)) {
1796                         ext4_warning(dir->i_sb,
1797                                      "bad inline directory (dir #%lu) - "
1798                                      "inode %u, rec_len %u, name_len %d"
1799                                      "inline size %d",
1800                                      dir->i_ino, le32_to_cpu(de->inode),
1801                                      le16_to_cpu(de->rec_len), de->name_len,
1802                                      inline_size);
1803                         ret = true;
1804                         goto out;
1805                 }
1806                 if (le32_to_cpu(de->inode)) {
1807                         ret = false;
1808                         goto out;
1809                 }
1810                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1811         }
1812
1813 out:
1814         up_read(&EXT4_I(dir)->xattr_sem);
1815         brelse(iloc.bh);
1816         return ret;
1817 }
1818
1819 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1820 {
1821         int ret, no_expand;
1822
1823         ext4_write_lock_xattr(inode, &no_expand);
1824         ret = ext4_destroy_inline_data_nolock(handle, inode);
1825         ext4_write_unlock_xattr(inode, &no_expand);
1826
1827         return ret;
1828 }
1829
1830 int ext4_inline_data_fiemap(struct inode *inode,
1831                             struct fiemap_extent_info *fieinfo,
1832                             int *has_inline, __u64 start, __u64 len)
1833 {
1834         __u64 physical = 0;
1835         __u64 inline_len;
1836         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1837                 FIEMAP_EXTENT_LAST;
1838         int error = 0;
1839         struct ext4_iloc iloc;
1840
1841         down_read(&EXT4_I(inode)->xattr_sem);
1842         if (!ext4_has_inline_data(inode)) {
1843                 *has_inline = 0;
1844                 goto out;
1845         }
1846         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1847                            i_size_read(inode));
1848         if (start >= inline_len)
1849                 goto out;
1850         if (start + len < inline_len)
1851                 inline_len = start + len;
1852         inline_len -= start;
1853
1854         error = ext4_get_inode_loc(inode, &iloc);
1855         if (error)
1856                 goto out;
1857
1858         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1859         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1860         physical += offsetof(struct ext4_inode, i_block);
1861
1862         if (physical)
1863                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1864                                                 inline_len, flags);
1865         brelse(iloc.bh);
1866 out:
1867         up_read(&EXT4_I(inode)->xattr_sem);
1868         return (error < 0 ? error : 0);
1869 }
1870
1871 /*
1872  * Called during xattr set, and if we can sparse space 'needed',
1873  * just create the extent tree evict the data to the outer block.
1874  *
1875  * We use jbd2 instead of page cache to move data to the 1st block
1876  * so that the whole transaction can be committed as a whole and
1877  * the data isn't lost because of the delayed page cache write.
1878  */
1879 int ext4_try_to_evict_inline_data(handle_t *handle,
1880                                   struct inode *inode,
1881                                   int needed)
1882 {
1883         int error;
1884         struct ext4_xattr_entry *entry;
1885         struct ext4_inode *raw_inode;
1886         struct ext4_iloc iloc;
1887
1888         error = ext4_get_inode_loc(inode, &iloc);
1889         if (error)
1890                 return error;
1891
1892         raw_inode = ext4_raw_inode(&iloc);
1893         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1894                                             EXT4_I(inode)->i_inline_off);
1895         if (EXT4_XATTR_LEN(entry->e_name_len) +
1896             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1897                 error = -ENOSPC;
1898                 goto out;
1899         }
1900
1901         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1902 out:
1903         brelse(iloc.bh);
1904         return error;
1905 }
1906
1907 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1908 {
1909         handle_t *handle;
1910         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1911         size_t i_size;
1912         void *value = NULL;
1913         struct ext4_xattr_ibody_find is = {
1914                 .s = { .not_found = -ENODATA, },
1915         };
1916         struct ext4_xattr_info i = {
1917                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1918                 .name = EXT4_XATTR_SYSTEM_DATA,
1919         };
1920
1921
1922         needed_blocks = ext4_writepage_trans_blocks(inode);
1923         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1924         if (IS_ERR(handle))
1925                 return PTR_ERR(handle);
1926
1927         ext4_write_lock_xattr(inode, &no_expand);
1928         if (!ext4_has_inline_data(inode)) {
1929                 *has_inline = 0;
1930                 ext4_journal_stop(handle);
1931                 return 0;
1932         }
1933
1934         if ((err = ext4_orphan_add(handle, inode)) != 0)
1935                 goto out;
1936
1937         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1938                 goto out;
1939
1940         down_write(&EXT4_I(inode)->i_data_sem);
1941         i_size = inode->i_size;
1942         inline_size = ext4_get_inline_size(inode);
1943         EXT4_I(inode)->i_disksize = i_size;
1944
1945         if (i_size < inline_size) {
1946                 /* Clear the content in the xattr space. */
1947                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1948                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1949                                 goto out_error;
1950
1951                         BUG_ON(is.s.not_found);
1952
1953                         value_len = le32_to_cpu(is.s.here->e_value_size);
1954                         value = kmalloc(value_len, GFP_NOFS);
1955                         if (!value) {
1956                                 err = -ENOMEM;
1957                                 goto out_error;
1958                         }
1959
1960                         err = ext4_xattr_ibody_get(inode, i.name_index,
1961                                                    i.name, value, value_len);
1962                         if (err <= 0)
1963                                 goto out_error;
1964
1965                         i.value = value;
1966                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1967                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1968                         err = ext4_xattr_ibody_inline_set(handle, inode,
1969                                                           &i, &is);
1970                         if (err)
1971                                 goto out_error;
1972                 }
1973
1974                 /* Clear the content within i_blocks. */
1975                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1976                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1977                         memset(p + i_size, 0,
1978                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1979                 }
1980
1981                 EXT4_I(inode)->i_inline_size = i_size <
1982                                         EXT4_MIN_INLINE_DATA_SIZE ?
1983                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1984         }
1985
1986 out_error:
1987         up_write(&EXT4_I(inode)->i_data_sem);
1988 out:
1989         brelse(is.iloc.bh);
1990         ext4_write_unlock_xattr(inode, &no_expand);
1991         kfree(value);
1992         if (inode->i_nlink)
1993                 ext4_orphan_del(handle, inode);
1994
1995         if (err == 0) {
1996                 inode->i_mtime = inode->i_ctime = current_time(inode);
1997                 err = ext4_mark_inode_dirty(handle, inode);
1998                 if (IS_SYNC(inode))
1999                         ext4_handle_sync(handle);
2000         }
2001         ext4_journal_stop(handle);
2002         return err;
2003 }
2004
2005 int ext4_convert_inline_data(struct inode *inode)
2006 {
2007         int error, needed_blocks, no_expand;
2008         handle_t *handle;
2009         struct ext4_iloc iloc;
2010
2011         if (!ext4_has_inline_data(inode)) {
2012                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2013                 return 0;
2014         }
2015
2016         needed_blocks = ext4_writepage_trans_blocks(inode);
2017
2018         iloc.bh = NULL;
2019         error = ext4_get_inode_loc(inode, &iloc);
2020         if (error)
2021                 return error;
2022
2023         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2024         if (IS_ERR(handle)) {
2025                 error = PTR_ERR(handle);
2026                 goto out_free;
2027         }
2028
2029         ext4_write_lock_xattr(inode, &no_expand);
2030         if (ext4_has_inline_data(inode))
2031                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2032         ext4_write_unlock_xattr(inode, &no_expand);
2033         ext4_journal_stop(handle);
2034 out_free:
2035         brelse(iloc.bh);
2036         return error;
2037 }