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/iomap.h>
  16 #include <linux/fiemap.h>
  17
  18 #include "ext4_jbd2.h"
  19 #include "ext4.h"
  20 #include "xattr.h"
  21 #include "truncate.h"
  22
  23 #define EXT4_XATTR_SYSTEM_DATA  "data"
  24 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  25 #define EXT4_INLINE_DOTDOT_OFFSET       2
  26 #define EXT4_INLINE_DOTDOT_SIZE         4
  27
  28 static int ext4_get_inline_size(struct inode *inode)
  29 {
  30         if (EXT4_I(inode)->i_inline_off)
  31                 return EXT4_I(inode)->i_inline_size;
  32
  33         return 0;
  34 }
  35
  36 static int get_max_inline_xattr_value_size(struct inode *inode,
  37                                            struct ext4_iloc *iloc)
  38 {
  39         struct ext4_xattr_ibody_header *header;
  40         struct ext4_xattr_entry *entry;
  41         struct ext4_inode *raw_inode;
  42         int free, min_offs;
  43
  44         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  45                         EXT4_GOOD_OLD_INODE_SIZE -
  46                         EXT4_I(inode)->i_extra_isize -
  47                         sizeof(struct ext4_xattr_ibody_header);
  48
  49         /*
  50          * We need to subtract another sizeof(__u32) since an in-inode xattr
  51          * needs an empty 4 bytes to indicate the gap between the xattr entry
  52          * and the name/value pair.
  53          */
  54         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  55                 return EXT4_XATTR_SIZE(min_offs -
  56                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  57                         EXT4_XATTR_ROUND - sizeof(__u32));
  58
  59         raw_inode = ext4_raw_inode(iloc);
  60         header = IHDR(inode, raw_inode);
  61         entry = IFIRST(header);
  62
  63         /* Compute min_offs. */
  64         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  65                 if (!entry->e_value_inum && entry->e_value_size) {
  66                         size_t offs = le16_to_cpu(entry->e_value_offs);
  67                         if (offs < min_offs)
  68                                 min_offs = offs;
  69                 }
  70         }
  71         free = min_offs -
  72                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  73
  74         if (EXT4_I(inode)->i_inline_off) {
  75                 entry = (struct ext4_xattr_entry *)
  76                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  77
  78                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  79                 goto out;
  80         }
  81
  82         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  83
  84         if (free > EXT4_XATTR_ROUND)
  85                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  86         else
  87                 free = 0;
  88
  89 out:
  90         return free;
  91 }
  92
  93 /*
  94  * Get the maximum size we now can store in an inode.
  95  * If we can't find the space for a xattr entry, don't use the space
  96  * of the extents since we have no space to indicate the inline data.
  97  */
  98 int ext4_get_max_inline_size(struct inode *inode)
  99 {
 100         int error, max_inline_size;
 101         struct ext4_iloc iloc;
 102
 103         if (EXT4_I(inode)->i_extra_isize == 0)
 104                 return 0;
 105
 106         error = ext4_get_inode_loc(inode, &iloc);
 107         if (error) {
 108                 ext4_error_inode(inode, __func__, __LINE__, 0,
 109                                  "can't get inode location %lu",
 110                                  inode->i_ino);
 111                 return 0;
 112         }
 113
 114         down_read(&EXT4_I(inode)->xattr_sem);
 115         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 116         up_read(&EXT4_I(inode)->xattr_sem);
 117
 118         brelse(iloc.bh);
 119
 120         if (!max_inline_size)
 121                 return 0;
 122
 123         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 124 }
 125
 126 /*
 127  * this function does not take xattr_sem, which is OK because it is
 128  * currently only used in a code path coming form ext4_iget, before
 129  * the new inode has been unlocked
 130  */
 131 int ext4_find_inline_data_nolock(struct inode *inode)
 132 {
 133         struct ext4_xattr_ibody_find is = {
 134                 .s = { .not_found = -ENODATA, },
 135         };
 136         struct ext4_xattr_info i = {
 137                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 138                 .name = EXT4_XATTR_SYSTEM_DATA,
 139         };
 140         int error;
 141
 142         if (EXT4_I(inode)->i_extra_isize == 0)
 143                 return 0;
 144
 145         error = ext4_get_inode_loc(inode, &is.iloc);
 146         if (error)
 147                 return error;
 148
 149         error = ext4_xattr_ibody_find(inode, &i, &is);
 150         if (error)
 151                 goto out;
 152
 153         if (!is.s.not_found) {
 154                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 155                                         (void *)ext4_raw_inode(&is.iloc));
 156                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 157                                 le32_to_cpu(is.s.here->e_value_size);
 158                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 159         }
 160 out:
 161         brelse(is.iloc.bh);
 162         return error;
 163 }
 164
 165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 166                                  unsigned int len,
 167                                  struct ext4_iloc *iloc)
 168 {
 169         struct ext4_xattr_entry *entry;
 170         struct ext4_xattr_ibody_header *header;
 171         int cp_len = 0;
 172         struct ext4_inode *raw_inode;
 173
 174         if (!len)
 175                 return 0;
 176
 177         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 178
 179         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 180                         len : EXT4_MIN_INLINE_DATA_SIZE;
 181
 182         raw_inode = ext4_raw_inode(iloc);
 183         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 184
 185         len -= cp_len;
 186         buffer += cp_len;
 187
 188         if (!len)
 189                 goto out;
 190
 191         header = IHDR(inode, raw_inode);
 192         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 193                                             EXT4_I(inode)->i_inline_off);
 194         len = min_t(unsigned int, len,
 195                     (unsigned int)le32_to_cpu(entry->e_value_size));
 196
 197         memcpy(buffer,
 198                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 199         cp_len += len;
 200
 201 out:
 202         return cp_len;
 203 }
 204
 205 /*
 206  * write the buffer to the inline inode.
 207  * If 'create' is set, we don't need to do the extra copy in the xattr
 208  * value since it is already handled by ext4_xattr_ibody_inline_set.
 209  * That saves us one memcpy.
 210  */
 211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 212                                    void *buffer, loff_t pos, unsigned int len)
 213 {
 214         struct ext4_xattr_entry *entry;
 215         struct ext4_xattr_ibody_header *header;
 216         struct ext4_inode *raw_inode;
 217         int cp_len = 0;
 218
 219         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 220                 return;
 221
 222         BUG_ON(!EXT4_I(inode)->i_inline_off);
 223         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 224
 225         raw_inode = ext4_raw_inode(iloc);
 226         buffer += pos;
 227
 228         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 229                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 230                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 231                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 232
 233                 len -= cp_len;
 234                 buffer += cp_len;
 235                 pos += cp_len;
 236         }
 237
 238         if (!len)
 239                 return;
 240
 241         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 242         header = IHDR(inode, raw_inode);
 243         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 244                                             EXT4_I(inode)->i_inline_off);
 245
 246         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 247                buffer, len);
 248 }
 249
 250 static int ext4_create_inline_data(handle_t *handle,
 251                                    struct inode *inode, unsigned len)
 252 {
 253         int error;
 254         void *value = NULL;
 255         struct ext4_xattr_ibody_find is = {
 256                 .s = { .not_found = -ENODATA, },
 257         };
 258         struct ext4_xattr_info i = {
 259                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 260                 .name = EXT4_XATTR_SYSTEM_DATA,
 261         };
 262
 263         error = ext4_get_inode_loc(inode, &is.iloc);
 264         if (error)
 265                 return error;
 266
 267         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 268         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 269         if (error)
 270                 goto out;
 271
 272         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 273                 value = EXT4_ZERO_XATTR_VALUE;
 274                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 275         } else {
 276                 value = "";
 277                 len = 0;
 278         }
 279
 280         /* Insert the the xttr entry. */
 281         i.value = value;
 282         i.value_len = len;
 283
 284         error = ext4_xattr_ibody_find(inode, &i, &is);
 285         if (error)
 286                 goto out;
 287
 288         BUG_ON(!is.s.not_found);
 289
 290         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 291         if (error) {
 292                 if (error == -ENOSPC)
 293                         ext4_clear_inode_state(inode,
 294                                                EXT4_STATE_MAY_INLINE_DATA);
 295                 goto out;
 296         }
 297
 298         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 299                 0, EXT4_MIN_INLINE_DATA_SIZE);
 300
 301         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 302                                       (void *)ext4_raw_inode(&is.iloc));
 303         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 304         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 305         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 306         get_bh(is.iloc.bh);
 307         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 308
 309 out:
 310         brelse(is.iloc.bh);
 311         return error;
 312 }
 313
 314 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 315                                    unsigned int len)
 316 {
 317         int error;
 318         void *value = NULL;
 319         struct ext4_xattr_ibody_find is = {
 320                 .s = { .not_found = -ENODATA, },
 321         };
 322         struct ext4_xattr_info i = {
 323                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 324                 .name = EXT4_XATTR_SYSTEM_DATA,
 325         };
 326
 327         /* If the old space is ok, write the data directly. */
 328         if (len <= EXT4_I(inode)->i_inline_size)
 329                 return 0;
 330
 331         error = ext4_get_inode_loc(inode, &is.iloc);
 332         if (error)
 333                 return error;
 334
 335         error = ext4_xattr_ibody_find(inode, &i, &is);
 336         if (error)
 337                 goto out;
 338
 339         BUG_ON(is.s.not_found);
 340
 341         len -= EXT4_MIN_INLINE_DATA_SIZE;
 342         value = kzalloc(len, GFP_NOFS);
 343         if (!value) {
 344                 error = -ENOMEM;
 345                 goto out;
 346         }
 347
 348         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 349                                      value, len);
 350         if (error == -ENODATA)
 351                 goto out;
 352
 353         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 354         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 355         if (error)
 356                 goto out;
 357
 358         /* Update the xttr entry. */
 359         i.value = value;
 360         i.value_len = len;
 361
 362         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 363         if (error)
 364                 goto out;
 365
 366         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 367                                       (void *)ext4_raw_inode(&is.iloc));
 368         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 369                                 le32_to_cpu(is.s.here->e_value_size);
 370         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 371         get_bh(is.iloc.bh);
 372         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 373
 374 out:
 375         kfree(value);
 376         brelse(is.iloc.bh);
 377         return error;
 378 }
 379
 380 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 381                                     unsigned int len)
 382 {
 383         int ret, size, no_expand;
 384         struct ext4_inode_info *ei = EXT4_I(inode);
 385
 386         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 387                 return -ENOSPC;
 388
 389         size = ext4_get_max_inline_size(inode);
 390         if (size < len)
 391                 return -ENOSPC;
 392
 393         ext4_write_lock_xattr(inode, &no_expand);
 394
 395         if (ei->i_inline_off)
 396                 ret = ext4_update_inline_data(handle, inode, len);
 397         else
 398                 ret = ext4_create_inline_data(handle, inode, len);
 399
 400         ext4_write_unlock_xattr(inode, &no_expand);
 401         return ret;
 402 }
 403
 404 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 405                                            struct inode *inode)
 406 {
 407         struct ext4_inode_info *ei = EXT4_I(inode);
 408         struct ext4_xattr_ibody_find is = {
 409                 .s = { .not_found = 0, },
 410         };
 411         struct ext4_xattr_info i = {
 412                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 413                 .name = EXT4_XATTR_SYSTEM_DATA,
 414                 .value = NULL,
 415                 .value_len = 0,
 416         };
 417         int error;
 418
 419         if (!ei->i_inline_off)
 420                 return 0;
 421
 422         error = ext4_get_inode_loc(inode, &is.iloc);
 423         if (error)
 424                 return error;
 425
 426         error = ext4_xattr_ibody_find(inode, &i, &is);
 427         if (error)
 428                 goto out;
 429
 430         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 431         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 432         if (error)
 433                 goto out;
 434
 435         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 436         if (error)
 437                 goto out;
 438
 439         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 440                 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         flags |= AOP_FLAG_NOFS;
 686
 687         page = grab_cache_page_write_begin(mapping, 0, flags);
 688         if (!page) {
 689                 ret = -ENOMEM;
 690                 goto out;
 691         }
 692
 693         *pagep = page;
 694         down_read(&EXT4_I(inode)->xattr_sem);
 695         if (!ext4_has_inline_data(inode)) {
 696                 ret = 0;
 697                 unlock_page(page);
 698                 put_page(page);
 699                 goto out_up_read;
 700         }
 701
 702         if (!PageUptodate(page)) {
 703                 ret = ext4_read_inline_page(inode, page);
 704                 if (ret < 0)
 705                         goto out_up_read;
 706         }
 707
 708         ret = 1;
 709         handle = NULL;
 710 out_up_read:
 711         up_read(&EXT4_I(inode)->xattr_sem);
 712 out:
 713         if (handle)
 714                 ext4_journal_stop(handle);
 715         brelse(iloc.bh);
 716         return ret;
 717 convert:
 718         return ext4_convert_inline_data_to_extent(mapping,
 719                                                   inode, flags);
 720 }
 721
 722 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 723                                unsigned copied, struct page *page)
 724 {
 725         int ret, no_expand;
 726         void *kaddr;
 727         struct ext4_iloc iloc;
 728
 729         if (unlikely(copied < len)) {
 730                 if (!PageUptodate(page)) {
 731                         copied = 0;
 732                         goto out;
 733                 }
 734         }
 735
 736         ret = ext4_get_inode_loc(inode, &iloc);
 737         if (ret) {
 738                 ext4_std_error(inode->i_sb, ret);
 739                 copied = 0;
 740                 goto out;
 741         }
 742
 743         ext4_write_lock_xattr(inode, &no_expand);
 744         BUG_ON(!ext4_has_inline_data(inode));
 745
 746         kaddr = kmap_atomic(page);
 747         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 748         kunmap_atomic(kaddr);
 749         SetPageUptodate(page);
 750         /* clear page dirty so that writepages wouldn't work for us. */
 751         ClearPageDirty(page);
 752
 753         ext4_write_unlock_xattr(inode, &no_expand);
 754         brelse(iloc.bh);
 755 out:
 756         return copied;
 757 }
 758
 759 struct buffer_head *
 760 ext4_journalled_write_inline_data(struct inode *inode,
 761                                   unsigned len,
 762                                   struct page *page)
 763 {
 764         int ret, no_expand;
 765         void *kaddr;
 766         struct ext4_iloc iloc;
 767
 768         ret = ext4_get_inode_loc(inode, &iloc);
 769         if (ret) {
 770                 ext4_std_error(inode->i_sb, ret);
 771                 return NULL;
 772         }
 773
 774         ext4_write_lock_xattr(inode, &no_expand);
 775         kaddr = kmap_atomic(page);
 776         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 777         kunmap_atomic(kaddr);
 778         ext4_write_unlock_xattr(inode, &no_expand);
 779
 780         return iloc.bh;
 781 }
 782
 783 /*
 784  * Try to make the page cache and handle ready for the inline data case.
 785  * We can call this function in 2 cases:
 786  * 1. The inode is created and the first write exceeds inline size. We can
 787  *    clear the inode state safely.
 788  * 2. The inode has inline data, then we need to read the data, make it
 789  *    update and dirty so that ext4_da_writepages can handle it. We don't
 790  *    need to start the journal since the file's metatdata isn't changed now.
 791  */
 792 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 793                                                  struct inode *inode,
 794                                                  unsigned flags,
 795                                                  void **fsdata)
 796 {
 797         int ret = 0, inline_size;
 798         struct page *page;
 799
 800         page = grab_cache_page_write_begin(mapping, 0, flags);
 801         if (!page)
 802                 return -ENOMEM;
 803
 804         down_read(&EXT4_I(inode)->xattr_sem);
 805         if (!ext4_has_inline_data(inode)) {
 806                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 807                 goto out;
 808         }
 809
 810         inline_size = ext4_get_inline_size(inode);
 811
 812         if (!PageUptodate(page)) {
 813                 ret = ext4_read_inline_page(inode, page);
 814                 if (ret < 0)
 815                         goto out;
 816         }
 817
 818         ret = __block_write_begin(page, 0, inline_size,
 819                                   ext4_da_get_block_prep);
 820         if (ret) {
 821                 up_read(&EXT4_I(inode)->xattr_sem);
 822                 unlock_page(page);
 823                 put_page(page);
 824                 ext4_truncate_failed_write(inode);
 825                 return ret;
 826         }
 827
 828         SetPageDirty(page);
 829         SetPageUptodate(page);
 830         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 831         *fsdata = (void *)CONVERT_INLINE_DATA;
 832
 833 out:
 834         up_read(&EXT4_I(inode)->xattr_sem);
 835         if (page) {
 836                 unlock_page(page);
 837                 put_page(page);
 838         }
 839         return ret;
 840 }
 841
 842 /*
 843  * Prepare the write for the inline data.
 844  * If the the data can be written into the inode, we just read
 845  * the page and make it uptodate, and start the journal.
 846  * Otherwise read the page, makes it dirty so that it can be
 847  * handle in writepages(the i_disksize update is left to the
 848  * normal ext4_da_write_end).
 849  */
 850 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 851                                     struct inode *inode,
 852                                     loff_t pos, unsigned len,
 853                                     unsigned flags,
 854                                     struct page **pagep,
 855                                     void **fsdata)
 856 {
 857         int ret, inline_size;
 858         handle_t *handle;
 859         struct page *page;
 860         struct ext4_iloc iloc;
 861         int retries;
 862
 863         ret = ext4_get_inode_loc(inode, &iloc);
 864         if (ret)
 865                 return ret;
 866
 867 retry_journal:
 868         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 869         if (IS_ERR(handle)) {
 870                 ret = PTR_ERR(handle);
 871                 goto out;
 872         }
 873
 874         inline_size = ext4_get_max_inline_size(inode);
 875
 876         ret = -ENOSPC;
 877         if (inline_size >= pos + len) {
 878                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 879                 if (ret && ret != -ENOSPC)
 880                         goto out_journal;
 881         }
 882
 883         /*
 884          * We cannot recurse into the filesystem as the transaction
 885          * is already started.
 886          */
 887         flags |= AOP_FLAG_NOFS;
 888
 889         if (ret == -ENOSPC) {
 890                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 891                                                             inode,
 892                                                             flags,
 893                                                             fsdata);
 894                 ext4_journal_stop(handle);
 895                 if (ret == -ENOSPC &&
 896                     ext4_should_retry_alloc(inode->i_sb, &retries))
 897                         goto retry_journal;
 898                 goto out;
 899         }
 900
 901
 902         page = grab_cache_page_write_begin(mapping, 0, flags);
 903         if (!page) {
 904                 ret = -ENOMEM;
 905                 goto out_journal;
 906         }
 907
 908         down_read(&EXT4_I(inode)->xattr_sem);
 909         if (!ext4_has_inline_data(inode)) {
 910                 ret = 0;
 911                 goto out_release_page;
 912         }
 913
 914         if (!PageUptodate(page)) {
 915                 ret = ext4_read_inline_page(inode, page);
 916                 if (ret < 0)
 917                         goto out_release_page;
 918         }
 919
 920         up_read(&EXT4_I(inode)->xattr_sem);
 921         *pagep = page;
 922         brelse(iloc.bh);
 923         return 1;
 924 out_release_page:
 925         up_read(&EXT4_I(inode)->xattr_sem);
 926         unlock_page(page);
 927         put_page(page);
 928 out_journal:
 929         ext4_journal_stop(handle);
 930 out:
 931         brelse(iloc.bh);
 932         return ret;
 933 }
 934
 935 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 936                                   unsigned len, unsigned copied,
 937                                   struct page *page)
 938 {
 939         int i_size_changed = 0;
 940         int ret;
 941
 942         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 943         if (ret < 0) {
 944                 unlock_page(page);
 945                 put_page(page);
 946                 return ret;
 947         }
 948         copied = ret;
 949
 950         /*
 951          * No need to use i_size_read() here, the i_size
 952          * cannot change under us because we hold i_mutex.
 953          *
 954          * But it's important to update i_size while still holding page lock:
 955          * page writeout could otherwise come in and zero beyond i_size.
 956          */
 957         if (pos+copied > inode->i_size) {
 958                 i_size_write(inode, pos+copied);
 959                 i_size_changed = 1;
 960         }
 961         unlock_page(page);
 962         put_page(page);
 963
 964         /*
 965          * Don't mark the inode dirty under page lock. First, it unnecessarily
 966          * makes the holding time of page lock longer. Second, it forces lock
 967          * ordering of page lock and transaction start for journaling
 968          * filesystems.
 969          */
 970         if (i_size_changed)
 971                 mark_inode_dirty(inode);
 972
 973         return copied;
 974 }
 975
 976 #ifdef INLINE_DIR_DEBUG
 977 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 978                           void *inline_start, int inline_size)
 979 {
 980         int offset;
 981         unsigned short de_len;
 982         struct ext4_dir_entry_2 *de = inline_start;
 983         void *dlimit = inline_start + inline_size;
 984
 985         trace_printk("inode %lu\n", dir->i_ino);
 986         offset = 0;
 987         while ((void *)de < dlimit) {
 988                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 989                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 990                              offset, de_len, de->name_len, de->name,
 991                              de->name_len, le32_to_cpu(de->inode));
 992                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 993                                          inline_start, inline_size, offset))
 994                         BUG();
 995
 996                 offset += de_len;
 997                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 998         }
 999 }
1000 #else
1001 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1002 #endif
1003
1004 /*
1005  * Add a new entry into a inline dir.
1006  * It will return -ENOSPC if no space is available, and -EIO
1007  * and -EEXIST if directory entry already exists.
1008  */
1009 static int ext4_add_dirent_to_inline(handle_t *handle,
1010                                      struct ext4_filename *fname,
1011                                      struct inode *dir,
1012                                      struct inode *inode,
1013                                      struct ext4_iloc *iloc,
1014                                      void *inline_start, int inline_size)
1015 {
1016         int             err;
1017         struct ext4_dir_entry_2 *de;
1018
1019         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1020                                 inline_size, fname, &de);
1021         if (err)
1022                 return err;
1023
1024         BUFFER_TRACE(iloc->bh, "get_write_access");
1025         err = ext4_journal_get_write_access(handle, iloc->bh);
1026         if (err)
1027                 return err;
1028         ext4_insert_dentry(inode, de, inline_size, fname);
1029
1030         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1031
1032         /*
1033          * XXX shouldn't update any times until successful
1034          * completion of syscall, but too many callers depend
1035          * on this.
1036          *
1037          * XXX similarly, too many callers depend on
1038          * ext4_new_inode() setting the times, but error
1039          * recovery deletes the inode, so the worst that can
1040          * happen is that the times are slightly out of date
1041          * and/or different from the directory change time.
1042          */
1043         dir->i_mtime = dir->i_ctime = current_time(dir);
1044         ext4_update_dx_flag(dir);
1045         dir->i_version++;
1046         return 1;
1047 }
1048
1049 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1050                                        struct ext4_iloc *iloc)
1051 {
1052         struct ext4_xattr_entry *entry;
1053         struct ext4_xattr_ibody_header *header;
1054
1055         BUG_ON(!EXT4_I(inode)->i_inline_off);
1056
1057         header = IHDR(inode, ext4_raw_inode(iloc));
1058         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1059                                             EXT4_I(inode)->i_inline_off);
1060
1061         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1062 }
1063
1064 /* Set the final de to cover the whole block. */
1065 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1066 {
1067         struct ext4_dir_entry_2 *de, *prev_de;
1068         void *limit;
1069         int de_len;
1070
1071         de = (struct ext4_dir_entry_2 *)de_buf;
1072         if (old_size) {
1073                 limit = de_buf + old_size;
1074                 do {
1075                         prev_de = de;
1076                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1077                         de_buf += de_len;
1078                         de = (struct ext4_dir_entry_2 *)de_buf;
1079                 } while (de_buf < limit);
1080
1081                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1082                                                         old_size, new_size);
1083         } else {
1084                 /* this is just created, so create an empty entry. */
1085                 de->inode = 0;
1086                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1087         }
1088 }
1089
1090 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1091                                   struct ext4_iloc *iloc)
1092 {
1093         int ret;
1094         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1095         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1096
1097         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1098                 return -ENOSPC;
1099
1100         ret = ext4_update_inline_data(handle, dir,
1101                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1102         if (ret)
1103                 return ret;
1104
1105         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1106                              EXT4_I(dir)->i_inline_size -
1107                                                 EXT4_MIN_INLINE_DATA_SIZE);
1108         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1109         return 0;
1110 }
1111
1112 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1113                                      struct ext4_iloc *iloc,
1114                                      void *buf, int inline_size)
1115 {
1116         ext4_create_inline_data(handle, inode, inline_size);
1117         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1118         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1119 }
1120
1121 static int ext4_finish_convert_inline_dir(handle_t *handle,
1122                                           struct inode *inode,
1123                                           struct buffer_head *dir_block,
1124                                           void *buf,
1125                                           int inline_size)
1126 {
1127         int err, csum_size = 0, header_size = 0;
1128         struct ext4_dir_entry_2 *de;
1129         struct ext4_dir_entry_tail *t;
1130         void *target = dir_block->b_data;
1131
1132         /*
1133          * First create "." and ".." and then copy the dir information
1134          * back to the block.
1135          */
1136         de = (struct ext4_dir_entry_2 *)target;
1137         de = ext4_init_dot_dotdot(inode, de,
1138                 inode->i_sb->s_blocksize, csum_size,
1139                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1140         header_size = (void *)de - target;
1141
1142         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1143                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1144
1145         if (ext4_has_metadata_csum(inode->i_sb))
1146                 csum_size = sizeof(struct ext4_dir_entry_tail);
1147
1148         inode->i_size = inode->i_sb->s_blocksize;
1149         i_size_write(inode, inode->i_sb->s_blocksize);
1150         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1151         ext4_update_final_de(dir_block->b_data,
1152                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1153                         inode->i_sb->s_blocksize - csum_size);
1154
1155         if (csum_size) {
1156                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1157                                      inode->i_sb->s_blocksize);
1158                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1159         }
1160         set_buffer_uptodate(dir_block);
1161         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1162         if (err)
1163                 return err;
1164         set_buffer_verified(dir_block);
1165         return ext4_mark_inode_dirty(handle, inode);
1166 }
1167
1168 static int ext4_convert_inline_data_nolock(handle_t *handle,
1169                                            struct inode *inode,
1170                                            struct ext4_iloc *iloc)
1171 {
1172         int error;
1173         void *buf = NULL;
1174         struct buffer_head *data_bh = NULL;
1175         struct ext4_map_blocks map;
1176         int inline_size;
1177
1178         inline_size = ext4_get_inline_size(inode);
1179         buf = kmalloc(inline_size, GFP_NOFS);
1180         if (!buf) {
1181                 error = -ENOMEM;
1182                 goto out;
1183         }
1184
1185         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1186         if (error < 0)
1187                 goto out;
1188
1189         /*
1190          * Make sure the inline directory entries pass checks before we try to
1191          * convert them, so that we avoid touching stuff that needs fsck.
1192          */
1193         if (S_ISDIR(inode->i_mode)) {
1194                 error = ext4_check_all_de(inode, iloc->bh,
1195                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1196                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1197                 if (error)
1198                         goto out;
1199         }
1200
1201         error = ext4_destroy_inline_data_nolock(handle, inode);
1202         if (error)
1203                 goto out;
1204
1205         map.m_lblk = 0;
1206         map.m_len = 1;
1207         map.m_flags = 0;
1208         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1209         if (error < 0)
1210                 goto out_restore;
1211         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1212                 error = -EIO;
1213                 goto out_restore;
1214         }
1215
1216         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1217         if (!data_bh) {
1218                 error = -ENOMEM;
1219                 goto out_restore;
1220         }
1221
1222         lock_buffer(data_bh);
1223         error = ext4_journal_get_create_access(handle, data_bh);
1224         if (error) {
1225                 unlock_buffer(data_bh);
1226                 error = -EIO;
1227                 goto out_restore;
1228         }
1229         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1230
1231         if (!S_ISDIR(inode->i_mode)) {
1232                 memcpy(data_bh->b_data, buf, inline_size);
1233                 set_buffer_uptodate(data_bh);
1234                 error = ext4_handle_dirty_metadata(handle,
1235                                                    inode, data_bh);
1236         } else {
1237                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1238                                                        buf, inline_size);
1239         }
1240
1241         unlock_buffer(data_bh);
1242 out_restore:
1243         if (error)
1244                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1245
1246 out:
1247         brelse(data_bh);
1248         kfree(buf);
1249         return error;
1250 }
1251
1252 /*
1253  * Try to add the new entry to the inline data.
1254  * If succeeds, return 0. If not, extended the inline dir and copied data to
1255  * the new created block.
1256  */
1257 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1258                               struct inode *dir, struct inode *inode)
1259 {
1260         int ret, inline_size, no_expand;
1261         void *inline_start;
1262         struct ext4_iloc iloc;
1263
1264         ret = ext4_get_inode_loc(dir, &iloc);
1265         if (ret)
1266                 return ret;
1267
1268         ext4_write_lock_xattr(dir, &no_expand);
1269         if (!ext4_has_inline_data(dir))
1270                 goto out;
1271
1272         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1273                                                  EXT4_INLINE_DOTDOT_SIZE;
1274         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1275
1276         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1277                                         inline_start, inline_size);
1278         if (ret != -ENOSPC)
1279                 goto out;
1280
1281         /* check whether it can be inserted to inline xattr space. */
1282         inline_size = EXT4_I(dir)->i_inline_size -
1283                         EXT4_MIN_INLINE_DATA_SIZE;
1284         if (!inline_size) {
1285                 /* Try to use the xattr space.*/
1286                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1287                 if (ret && ret != -ENOSPC)
1288                         goto out;
1289
1290                 inline_size = EXT4_I(dir)->i_inline_size -
1291                                 EXT4_MIN_INLINE_DATA_SIZE;
1292         }
1293
1294         if (inline_size) {
1295                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1296
1297                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1298                                                 inode, &iloc, inline_start,
1299                                                 inline_size);
1300
1301                 if (ret != -ENOSPC)
1302                         goto out;
1303         }
1304
1305         /*
1306          * The inline space is filled up, so create a new block for it.
1307          * As the extent tree will be created, we have to save the inline
1308          * dir first.
1309          */
1310         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1311
1312 out:
1313         ext4_write_unlock_xattr(dir, &no_expand);
1314         ext4_mark_inode_dirty(handle, dir);
1315         brelse(iloc.bh);
1316         return ret;
1317 }
1318
1319 /*
1320  * This function fills a red-black tree with information from an
1321  * inlined dir.  It returns the number directory entries loaded
1322  * into the tree.  If there is an error it is returned in err.
1323  */
1324 int htree_inlinedir_to_tree(struct file *dir_file,
1325                             struct inode *dir, ext4_lblk_t block,
1326                             struct dx_hash_info *hinfo,
1327                             __u32 start_hash, __u32 start_minor_hash,
1328                             int *has_inline_data)
1329 {
1330         int err = 0, count = 0;
1331         unsigned int parent_ino;
1332         int pos;
1333         struct ext4_dir_entry_2 *de;
1334         struct inode *inode = file_inode(dir_file);
1335         int ret, inline_size = 0;
1336         struct ext4_iloc iloc;
1337         void *dir_buf = NULL;
1338         struct ext4_dir_entry_2 fake;
1339         struct fscrypt_str tmp_str;
1340
1341         ret = ext4_get_inode_loc(inode, &iloc);
1342         if (ret)
1343                 return ret;
1344
1345         down_read(&EXT4_I(inode)->xattr_sem);
1346         if (!ext4_has_inline_data(inode)) {
1347                 up_read(&EXT4_I(inode)->xattr_sem);
1348                 *has_inline_data = 0;
1349                 goto out;
1350         }
1351
1352         inline_size = ext4_get_inline_size(inode);
1353         dir_buf = kmalloc(inline_size, GFP_NOFS);
1354         if (!dir_buf) {
1355                 ret = -ENOMEM;
1356                 up_read(&EXT4_I(inode)->xattr_sem);
1357                 goto out;
1358         }
1359
1360         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1361         up_read(&EXT4_I(inode)->xattr_sem);
1362         if (ret < 0)
1363                 goto out;
1364
1365         pos = 0;
1366         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1367         while (pos < inline_size) {
1368                 /*
1369                  * As inlined dir doesn't store any information about '.' and
1370                  * only the inode number of '..' is stored, we have to handle
1371                  * them differently.
1372                  */
1373                 if (pos == 0) {
1374                         fake.inode = cpu_to_le32(inode->i_ino);
1375                         fake.name_len = 1;
1376                         strcpy(fake.name, ".");
1377                         fake.rec_len = ext4_rec_len_to_disk(
1378                                                 EXT4_DIR_REC_LEN(fake.name_len),
1379                                                 inline_size);
1380                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1381                         de = &fake;
1382                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1383                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1384                         fake.inode = cpu_to_le32(parent_ino);
1385                         fake.name_len = 2;
1386                         strcpy(fake.name, "..");
1387                         fake.rec_len = ext4_rec_len_to_disk(
1388                                                 EXT4_DIR_REC_LEN(fake.name_len),
1389                                                 inline_size);
1390                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1391                         de = &fake;
1392                         pos = EXT4_INLINE_DOTDOT_SIZE;
1393                 } else {
1394                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1395                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1396                         if (ext4_check_dir_entry(inode, dir_file, de,
1397                                          iloc.bh, dir_buf,
1398                                          inline_size, pos)) {
1399                                 ret = count;
1400                                 goto out;
1401                         }
1402                 }
1403
1404                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1405                 if ((hinfo->hash < start_hash) ||
1406                     ((hinfo->hash == start_hash) &&
1407                      (hinfo->minor_hash < start_minor_hash)))
1408                         continue;
1409                 if (de->inode == 0)
1410                         continue;
1411                 tmp_str.name = de->name;
1412                 tmp_str.len = de->name_len;
1413                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1414                                               hinfo->minor_hash, de, &tmp_str);
1415                 if (err) {
1416                         count = err;
1417                         goto out;
1418                 }
1419                 count++;
1420         }
1421         ret = count;
1422 out:
1423         kfree(dir_buf);
1424         brelse(iloc.bh);
1425         return ret;
1426 }
1427
1428 /*
1429  * So this function is called when the volume is mkfsed with
1430  * dir_index disabled. In order to keep f_pos persistent
1431  * after we convert from an inlined dir to a blocked based,
1432  * we just pretend that we are a normal dir and return the
1433  * offset as if '.' and '..' really take place.
1434  *
1435  */
1436 int ext4_read_inline_dir(struct file *file,
1437                          struct dir_context *ctx,
1438                          int *has_inline_data)
1439 {
1440         unsigned int offset, parent_ino;
1441         int i;
1442         struct ext4_dir_entry_2 *de;
1443         struct super_block *sb;
1444         struct inode *inode = file_inode(file);
1445         int ret, inline_size = 0;
1446         struct ext4_iloc iloc;
1447         void *dir_buf = NULL;
1448         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1449
1450         ret = ext4_get_inode_loc(inode, &iloc);
1451         if (ret)
1452                 return ret;
1453
1454         down_read(&EXT4_I(inode)->xattr_sem);
1455         if (!ext4_has_inline_data(inode)) {
1456                 up_read(&EXT4_I(inode)->xattr_sem);
1457                 *has_inline_data = 0;
1458                 goto out;
1459         }
1460
1461         inline_size = ext4_get_inline_size(inode);
1462         dir_buf = kmalloc(inline_size, GFP_NOFS);
1463         if (!dir_buf) {
1464                 ret = -ENOMEM;
1465                 up_read(&EXT4_I(inode)->xattr_sem);
1466                 goto out;
1467         }
1468
1469         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1470         up_read(&EXT4_I(inode)->xattr_sem);
1471         if (ret < 0)
1472                 goto out;
1473
1474         ret = 0;
1475         sb = inode->i_sb;
1476         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1477         offset = ctx->pos;
1478
1479         /*
1480          * dotdot_offset and dotdot_size is the real offset and
1481          * size for ".." and "." if the dir is block based while
1482          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1483          * So we will use extra_offset and extra_size to indicate them
1484          * during the inline dir iteration.
1485          */
1486         dotdot_offset = EXT4_DIR_REC_LEN(1);
1487         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1488         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1489         extra_size = extra_offset + inline_size;
1490
1491         /*
1492          * If the version has changed since the last call to
1493          * readdir(2), then we might be pointing to an invalid
1494          * dirent right now.  Scan from the start of the inline
1495          * dir to make sure.
1496          */
1497         if (file->f_version != inode->i_version) {
1498                 for (i = 0; i < extra_size && i < offset;) {
1499                         /*
1500                          * "." is with offset 0 and
1501                          * ".." is dotdot_offset.
1502                          */
1503                         if (!i) {
1504                                 i = dotdot_offset;
1505                                 continue;
1506                         } else if (i == dotdot_offset) {
1507                                 i = dotdot_size;
1508                                 continue;
1509                         }
1510                         /* for other entry, the real offset in
1511                          * the buf has to be tuned accordingly.
1512                          */
1513                         de = (struct ext4_dir_entry_2 *)
1514                                 (dir_buf + i - extra_offset);
1515                         /* It's too expensive to do a full
1516                          * dirent test each time round this
1517                          * loop, but we do have to test at
1518                          * least that it is non-zero.  A
1519                          * failure will be detected in the
1520                          * dirent test below. */
1521                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1522                                 < EXT4_DIR_REC_LEN(1))
1523                                 break;
1524                         i += ext4_rec_len_from_disk(de->rec_len,
1525                                                     extra_size);
1526                 }
1527                 offset = i;
1528                 ctx->pos = offset;
1529                 file->f_version = inode->i_version;
1530         }
1531
1532         while (ctx->pos < extra_size) {
1533                 if (ctx->pos == 0) {
1534                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1535                                 goto out;
1536                         ctx->pos = dotdot_offset;
1537                         continue;
1538                 }
1539
1540                 if (ctx->pos == dotdot_offset) {
1541                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1542                                 goto out;
1543                         ctx->pos = dotdot_size;
1544                         continue;
1545                 }
1546
1547                 de = (struct ext4_dir_entry_2 *)
1548                         (dir_buf + ctx->pos - extra_offset);
1549                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1550                                          extra_size, ctx->pos))
1551                         goto out;
1552                 if (le32_to_cpu(de->inode)) {
1553                         if (!dir_emit(ctx, de->name, de->name_len,
1554                                       le32_to_cpu(de->inode),
1555                                       get_dtype(sb, de->file_type)))
1556                                 goto out;
1557                 }
1558                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1559         }
1560 out:
1561         kfree(dir_buf);
1562         brelse(iloc.bh);
1563         return ret;
1564 }
1565
1566 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1567                                         struct ext4_dir_entry_2 **parent_de,
1568                                         int *retval)
1569 {
1570         struct ext4_iloc iloc;
1571
1572         *retval = ext4_get_inode_loc(inode, &iloc);
1573         if (*retval)
1574                 return NULL;
1575
1576         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1577
1578         return iloc.bh;
1579 }
1580
1581 /*
1582  * Try to create the inline data for the new dir.
1583  * If it succeeds, return 0, otherwise return the error.
1584  * In case of ENOSPC, the caller should create the normal disk layout dir.
1585  */
1586 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1587                                struct inode *inode)
1588 {
1589         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1590         struct ext4_iloc iloc;
1591         struct ext4_dir_entry_2 *de;
1592
1593         ret = ext4_get_inode_loc(inode, &iloc);
1594         if (ret)
1595                 return ret;
1596
1597         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1598         if (ret)
1599                 goto out;
1600
1601         /*
1602          * For inline dir, we only save the inode information for the ".."
1603          * and create a fake dentry to cover the left space.
1604          */
1605         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1606         de->inode = cpu_to_le32(parent->i_ino);
1607         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1608         de->inode = 0;
1609         de->rec_len = ext4_rec_len_to_disk(
1610                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1611                                 inline_size);
1612         set_nlink(inode, 2);
1613         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1614 out:
1615         brelse(iloc.bh);
1616         return ret;
1617 }
1618
1619 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1620                                         struct ext4_filename *fname,
1621                                         struct ext4_dir_entry_2 **res_dir,
1622                                         int *has_inline_data)
1623 {
1624         int ret;
1625         struct ext4_iloc iloc;
1626         void *inline_start;
1627         int inline_size;
1628
1629         if (ext4_get_inode_loc(dir, &iloc))
1630                 return NULL;
1631
1632         down_read(&EXT4_I(dir)->xattr_sem);
1633         if (!ext4_has_inline_data(dir)) {
1634                 *has_inline_data = 0;
1635                 goto out;
1636         }
1637
1638         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1639                                                 EXT4_INLINE_DOTDOT_SIZE;
1640         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1641         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1642                               dir, fname, 0, res_dir);
1643         if (ret == 1)
1644                 goto out_find;
1645         if (ret < 0)
1646                 goto out;
1647
1648         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1649                 goto out;
1650
1651         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1652         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1653
1654         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1655                               dir, fname, 0, res_dir);
1656         if (ret == 1)
1657                 goto out_find;
1658
1659 out:
1660         brelse(iloc.bh);
1661         iloc.bh = NULL;
1662 out_find:
1663         up_read(&EXT4_I(dir)->xattr_sem);
1664         return iloc.bh;
1665 }
1666
1667 int ext4_delete_inline_entry(handle_t *handle,
1668                              struct inode *dir,
1669                              struct ext4_dir_entry_2 *de_del,
1670                              struct buffer_head *bh,
1671                              int *has_inline_data)
1672 {
1673         int err, inline_size, no_expand;
1674         struct ext4_iloc iloc;
1675         void *inline_start;
1676
1677         err = ext4_get_inode_loc(dir, &iloc);
1678         if (err)
1679                 return err;
1680
1681         ext4_write_lock_xattr(dir, &no_expand);
1682         if (!ext4_has_inline_data(dir)) {
1683                 *has_inline_data = 0;
1684                 goto out;
1685         }
1686
1687         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1688                 EXT4_MIN_INLINE_DATA_SIZE) {
1689                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1690                                         EXT4_INLINE_DOTDOT_SIZE;
1691                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1692                                 EXT4_INLINE_DOTDOT_SIZE;
1693         } else {
1694                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1695                 inline_size = ext4_get_inline_size(dir) -
1696                                 EXT4_MIN_INLINE_DATA_SIZE;
1697         }
1698
1699         BUFFER_TRACE(bh, "get_write_access");
1700         err = ext4_journal_get_write_access(handle, bh);
1701         if (err)
1702                 goto out;
1703
1704         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1705                                         inline_start, inline_size, 0);
1706         if (err)
1707                 goto out;
1708
1709         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1710 out:
1711         ext4_write_unlock_xattr(dir, &no_expand);
1712         if (likely(err == 0))
1713                 err = ext4_mark_inode_dirty(handle, dir);
1714         brelse(iloc.bh);
1715         if (err != -ENOENT)
1716                 ext4_std_error(dir->i_sb, err);
1717         return err;
1718 }
1719
1720 /*
1721  * Get the inline dentry at offset.
1722  */
1723 static inline struct ext4_dir_entry_2 *
1724 ext4_get_inline_entry(struct inode *inode,
1725                       struct ext4_iloc *iloc,
1726                       unsigned int offset,
1727                       void **inline_start,
1728                       int *inline_size)
1729 {
1730         void *inline_pos;
1731
1732         BUG_ON(offset > ext4_get_inline_size(inode));
1733
1734         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1735                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1736                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1737         } else {
1738                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1739                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1740                 *inline_size = ext4_get_inline_size(inode) -
1741                                 EXT4_MIN_INLINE_DATA_SIZE;
1742         }
1743
1744         if (inline_start)
1745                 *inline_start = inline_pos;
1746         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1747 }
1748
1749 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1750 {
1751         int err, inline_size;
1752         struct ext4_iloc iloc;
1753         void *inline_pos;
1754         unsigned int offset;
1755         struct ext4_dir_entry_2 *de;
1756         bool ret = true;
1757
1758         err = ext4_get_inode_loc(dir, &iloc);
1759         if (err) {
1760                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1761                                  err, dir->i_ino);
1762                 return true;
1763         }
1764
1765         down_read(&EXT4_I(dir)->xattr_sem);
1766         if (!ext4_has_inline_data(dir)) {
1767                 *has_inline_data = 0;
1768                 goto out;
1769         }
1770
1771         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1772         if (!le32_to_cpu(de->inode)) {
1773                 ext4_warning(dir->i_sb,
1774                              "bad inline directory (dir #%lu) - no `..'",
1775                              dir->i_ino);
1776                 ret = true;
1777                 goto out;
1778         }
1779
1780         offset = EXT4_INLINE_DOTDOT_SIZE;
1781         while (offset < dir->i_size) {
1782                 de = ext4_get_inline_entry(dir, &iloc, offset,
1783                                            &inline_pos, &inline_size);
1784                 if (ext4_check_dir_entry(dir, NULL, de,
1785                                          iloc.bh, inline_pos,
1786                                          inline_size, offset)) {
1787                         ext4_warning(dir->i_sb,
1788                                      "bad inline directory (dir #%lu) - "
1789                                      "inode %u, rec_len %u, name_len %d"
1790                                      "inline size %d",
1791                                      dir->i_ino, le32_to_cpu(de->inode),
1792                                      le16_to_cpu(de->rec_len), de->name_len,
1793                                      inline_size);
1794                         ret = true;
1795                         goto out;
1796                 }
1797                 if (le32_to_cpu(de->inode)) {
1798                         ret = false;
1799                         goto out;
1800                 }
1801                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1802         }
1803
1804 out:
1805         up_read(&EXT4_I(dir)->xattr_sem);
1806         brelse(iloc.bh);
1807         return ret;
1808 }
1809
1810 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1811 {
1812         int ret, no_expand;
1813
1814         ext4_write_lock_xattr(inode, &no_expand);
1815         ret = ext4_destroy_inline_data_nolock(handle, inode);
1816         ext4_write_unlock_xattr(inode, &no_expand);
1817
1818         return ret;
1819 }
1820
1821 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1822 {
1823         __u64 addr;
1824         int error = -EAGAIN;
1825         struct ext4_iloc iloc;
1826
1827         down_read(&EXT4_I(inode)->xattr_sem);
1828         if (!ext4_has_inline_data(inode))
1829                 goto out;
1830
1831         error = ext4_get_inode_loc(inode, &iloc);
1832         if (error)
1833                 goto out;
1834
1835         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1836         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1837         addr += offsetof(struct ext4_inode, i_block);
1838
1839         brelse(iloc.bh);
1840
1841         iomap->addr = addr;
1842         iomap->offset = 0;
1843         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1844                               i_size_read(inode));
1845         iomap->type = 0;
1846         iomap->flags = IOMAP_F_DATA_INLINE;
1847
1848 out:
1849         up_read(&EXT4_I(inode)->xattr_sem);
1850         return error;
1851 }
1852
1853 int ext4_inline_data_fiemap(struct inode *inode,
1854                             struct fiemap_extent_info *fieinfo,
1855                             int *has_inline, __u64 start, __u64 len)
1856 {
1857         __u64 physical = 0;
1858         __u64 inline_len;
1859         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1860                 FIEMAP_EXTENT_LAST;
1861         int error = 0;
1862         struct ext4_iloc iloc;
1863
1864         down_read(&EXT4_I(inode)->xattr_sem);
1865         if (!ext4_has_inline_data(inode)) {
1866                 *has_inline = 0;
1867                 goto out;
1868         }
1869         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1870                            i_size_read(inode));
1871         if (start >= inline_len)
1872                 goto out;
1873         if (start + len < inline_len)
1874                 inline_len = start + len;
1875         inline_len -= start;
1876
1877         error = ext4_get_inode_loc(inode, &iloc);
1878         if (error)
1879                 goto out;
1880
1881         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1882         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1883         physical += offsetof(struct ext4_inode, i_block);
1884
1885         if (physical)
1886                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1887                                                 inline_len, flags);
1888         brelse(iloc.bh);
1889 out:
1890         up_read(&EXT4_I(inode)->xattr_sem);
1891         return (error < 0 ? error : 0);
1892 }
1893
1894 /*
1895  * Called during xattr set, and if we can sparse space 'needed',
1896  * just create the extent tree evict the data to the outer block.
1897  *
1898  * We use jbd2 instead of page cache to move data to the 1st block
1899  * so that the whole transaction can be committed as a whole and
1900  * the data isn't lost because of the delayed page cache write.
1901  */
1902 int ext4_try_to_evict_inline_data(handle_t *handle,
1903                                   struct inode *inode,
1904                                   int needed)
1905 {
1906         int error;
1907         struct ext4_xattr_entry *entry;
1908         struct ext4_inode *raw_inode;
1909         struct ext4_iloc iloc;
1910
1911         error = ext4_get_inode_loc(inode, &iloc);
1912         if (error)
1913                 return error;
1914
1915         raw_inode = ext4_raw_inode(&iloc);
1916         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1917                                             EXT4_I(inode)->i_inline_off);
1918         if (EXT4_XATTR_LEN(entry->e_name_len) +
1919             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1920                 error = -ENOSPC;
1921                 goto out;
1922         }
1923
1924         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1925 out:
1926         brelse(iloc.bh);
1927         return error;
1928 }
1929
1930 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1931 {
1932         handle_t *handle;
1933         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1934         size_t i_size;
1935         void *value = NULL;
1936         struct ext4_xattr_ibody_find is = {
1937                 .s = { .not_found = -ENODATA, },
1938         };
1939         struct ext4_xattr_info i = {
1940                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1941                 .name = EXT4_XATTR_SYSTEM_DATA,
1942         };
1943
1944
1945         needed_blocks = ext4_writepage_trans_blocks(inode);
1946         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1947         if (IS_ERR(handle))
1948                 return PTR_ERR(handle);
1949
1950         ext4_write_lock_xattr(inode, &no_expand);
1951         if (!ext4_has_inline_data(inode)) {
1952                 *has_inline = 0;
1953                 ext4_journal_stop(handle);
1954                 return 0;
1955         }
1956
1957         if ((err = ext4_orphan_add(handle, inode)) != 0)
1958                 goto out;
1959
1960         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1961                 goto out;
1962
1963         down_write(&EXT4_I(inode)->i_data_sem);
1964         i_size = inode->i_size;
1965         inline_size = ext4_get_inline_size(inode);
1966         EXT4_I(inode)->i_disksize = i_size;
1967
1968         if (i_size < inline_size) {
1969                 /* Clear the content in the xattr space. */
1970                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1971                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1972                                 goto out_error;
1973
1974                         BUG_ON(is.s.not_found);
1975
1976                         value_len = le32_to_cpu(is.s.here->e_value_size);
1977                         value = kmalloc(value_len, GFP_NOFS);
1978                         if (!value) {
1979                                 err = -ENOMEM;
1980                                 goto out_error;
1981                         }
1982
1983                         err = ext4_xattr_ibody_get(inode, i.name_index,
1984                                                    i.name, value, value_len);
1985                         if (err <= 0)
1986                                 goto out_error;
1987
1988                         i.value = value;
1989                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1990                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1991                         err = ext4_xattr_ibody_inline_set(handle, inode,
1992                                                           &i, &is);
1993                         if (err)
1994                                 goto out_error;
1995                 }
1996
1997                 /* Clear the content within i_blocks. */
1998                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1999                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2000                         memset(p + i_size, 0,
2001                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
2002                 }
2003
2004                 EXT4_I(inode)->i_inline_size = i_size <
2005                                         EXT4_MIN_INLINE_DATA_SIZE ?
2006                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2007         }
2008
2009 out_error:
2010         up_write(&EXT4_I(inode)->i_data_sem);
2011 out:
2012         brelse(is.iloc.bh);
2013         ext4_write_unlock_xattr(inode, &no_expand);
2014         kfree(value);
2015         if (inode->i_nlink)
2016                 ext4_orphan_del(handle, inode);
2017
2018         if (err == 0) {
2019                 inode->i_mtime = inode->i_ctime = current_time(inode);
2020                 err = ext4_mark_inode_dirty(handle, inode);
2021                 if (IS_SYNC(inode))
2022                         ext4_handle_sync(handle);
2023         }
2024         ext4_journal_stop(handle);
2025         return err;
2026 }
2027
2028 int ext4_convert_inline_data(struct inode *inode)
2029 {
2030         int error, needed_blocks, no_expand;
2031         handle_t *handle;
2032         struct ext4_iloc iloc;
2033
2034         if (!ext4_has_inline_data(inode)) {
2035                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2036                 return 0;
2037         }
2038
2039         needed_blocks = ext4_writepage_trans_blocks(inode);
2040
2041         iloc.bh = NULL;
2042         error = ext4_get_inode_loc(inode, &iloc);
2043         if (error)
2044                 return error;
2045
2046         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2047         if (IS_ERR(handle)) {
2048                 error = PTR_ERR(handle);
2049                 goto out_free;
2050         }
2051
2052         ext4_write_lock_xattr(inode, &no_expand);
2053         if (ext4_has_inline_data(inode))
2054                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2055         ext4_write_unlock_xattr(inode, &no_expand);
2056         ext4_journal_stop(handle);
2057 out_free:
2058         brelse(iloc.bh);
2059         return error;
2060 }