fs/ext4/inline.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (c) 2012 Taobao.
   4  * Written by Tao Ma <boyu.mt@taobao.com>
   5  */
   6
   7 #include <linux/iomap.h>
   8 #include <linux/fiemap.h>
   9 #include <linux/namei.h>
  10 #include <linux/iversion.h>
  11 #include <linux/sched/mm.h>
  12
  13 #include "ext4_jbd2.h"
  14 #include "ext4.h"
  15 #include "xattr.h"
  16 #include "truncate.h"
  17
  18 #define EXT4_XATTR_SYSTEM_DATA  "data"
  19 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  20 #define EXT4_INLINE_DOTDOT_OFFSET       2
  21 #define EXT4_INLINE_DOTDOT_SIZE         4
  22
  23 static int ext4_get_inline_size(struct inode *inode)
  24 {
  25         if (EXT4_I(inode)->i_inline_off)
  26                 return EXT4_I(inode)->i_inline_size;
  27
  28         return 0;
  29 }
  30
  31 static int get_max_inline_xattr_value_size(struct inode *inode,
  32                                            struct ext4_iloc *iloc)
  33 {
  34         struct ext4_xattr_ibody_header *header;
  35         struct ext4_xattr_entry *entry;
  36         struct ext4_inode *raw_inode;
  37         int free, min_offs;
  38
  39         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  40                 return 0;
  41
  42         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  43                         EXT4_GOOD_OLD_INODE_SIZE -
  44                         EXT4_I(inode)->i_extra_isize -
  45                         sizeof(struct ext4_xattr_ibody_header);
  46
  47         /*
  48          * We need to subtract another sizeof(__u32) since an in-inode xattr
  49          * needs an empty 4 bytes to indicate the gap between the xattr entry
  50          * and the name/value pair.
  51          */
  52         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  53                 return EXT4_XATTR_SIZE(min_offs -
  54                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  55                         EXT4_XATTR_ROUND - sizeof(__u32));
  56
  57         raw_inode = ext4_raw_inode(iloc);
  58         header = IHDR(inode, raw_inode);
  59         entry = IFIRST(header);
  60
  61         /* Compute min_offs. */
  62         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  63                 if (!entry->e_value_inum && entry->e_value_size) {
  64                         size_t offs = le16_to_cpu(entry->e_value_offs);
  65                         if (offs < min_offs)
  66                                 min_offs = offs;
  67                 }
  68         }
  69         free = min_offs -
  70                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  71
  72         if (EXT4_I(inode)->i_inline_off) {
  73                 entry = (struct ext4_xattr_entry *)
  74                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  75
  76                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  77                 goto out;
  78         }
  79
  80         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  81
  82         if (free > EXT4_XATTR_ROUND)
  83                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  84         else
  85                 free = 0;
  86
  87 out:
  88         return free;
  89 }
  90
  91 /*
  92  * Get the maximum size we now can store in an inode.
  93  * If we can't find the space for a xattr entry, don't use the space
  94  * of the extents since we have no space to indicate the inline data.
  95  */
  96 int ext4_get_max_inline_size(struct inode *inode)
  97 {
  98         int error, max_inline_size;
  99         struct ext4_iloc iloc;
 100
 101         if (EXT4_I(inode)->i_extra_isize == 0)
 102                 return 0;
 103
 104         error = ext4_get_inode_loc(inode, &iloc);
 105         if (error) {
 106                 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 107                                      "can't get inode location %lu",
 108                                      inode->i_ino);
 109                 return 0;
 110         }
 111
 112         down_read(&EXT4_I(inode)->xattr_sem);
 113         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 114         up_read(&EXT4_I(inode)->xattr_sem);
 115
 116         brelse(iloc.bh);
 117
 118         if (!max_inline_size)
 119                 return 0;
 120
 121         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 122 }
 123
 124 /*
 125  * this function does not take xattr_sem, which is OK because it is
 126  * currently only used in a code path coming form ext4_iget, before
 127  * the new inode has been unlocked
 128  */
 129 int ext4_find_inline_data_nolock(struct inode *inode)
 130 {
 131         struct ext4_xattr_ibody_find is = {
 132                 .s = { .not_found = -ENODATA, },
 133         };
 134         struct ext4_xattr_info i = {
 135                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 136                 .name = EXT4_XATTR_SYSTEM_DATA,
 137         };
 138         int error;
 139
 140         if (EXT4_I(inode)->i_extra_isize == 0)
 141                 return 0;
 142
 143         error = ext4_get_inode_loc(inode, &is.iloc);
 144         if (error)
 145                 return error;
 146
 147         error = ext4_xattr_ibody_find(inode, &i, &is);
 148         if (error)
 149                 goto out;
 150
 151         if (!is.s.not_found) {
 152                 if (is.s.here->e_value_inum) {
 153                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 154                                          "to an external xattr inode");
 155                         error = -EFSCORRUPTED;
 156                         goto out;
 157                 }
 158                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 159                                         (void *)ext4_raw_inode(&is.iloc));
 160                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 161                                 le32_to_cpu(is.s.here->e_value_size);
 162         }
 163 out:
 164         brelse(is.iloc.bh);
 165         return error;
 166 }
 167
 168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 169                                  unsigned int len,
 170                                  struct ext4_iloc *iloc)
 171 {
 172         struct ext4_xattr_entry *entry;
 173         struct ext4_xattr_ibody_header *header;
 174         int cp_len = 0;
 175         struct ext4_inode *raw_inode;
 176
 177         if (!len)
 178                 return 0;
 179
 180         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 181
 182         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 183                         len : EXT4_MIN_INLINE_DATA_SIZE;
 184
 185         raw_inode = ext4_raw_inode(iloc);
 186         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 187
 188         len -= cp_len;
 189         buffer += cp_len;
 190
 191         if (!len)
 192                 goto out;
 193
 194         header = IHDR(inode, raw_inode);
 195         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 196                                             EXT4_I(inode)->i_inline_off);
 197         len = min_t(unsigned int, len,
 198                     (unsigned int)le32_to_cpu(entry->e_value_size));
 199
 200         memcpy(buffer,
 201                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 202         cp_len += len;
 203
 204 out:
 205         return cp_len;
 206 }
 207
 208 /*
 209  * write the buffer to the inline inode.
 210  * If 'create' is set, we don't need to do the extra copy in the xattr
 211  * value since it is already handled by ext4_xattr_ibody_set.
 212  * That saves us one memcpy.
 213  */
 214 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 215                                    void *buffer, loff_t pos, unsigned int len)
 216 {
 217         struct ext4_xattr_entry *entry;
 218         struct ext4_xattr_ibody_header *header;
 219         struct ext4_inode *raw_inode;
 220         int cp_len = 0;
 221
 222         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 223                 return;
 224
 225         BUG_ON(!EXT4_I(inode)->i_inline_off);
 226         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 227
 228         raw_inode = ext4_raw_inode(iloc);
 229         buffer += pos;
 230
 231         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 232                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 233                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 234                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 235
 236                 len -= cp_len;
 237                 buffer += cp_len;
 238                 pos += cp_len;
 239         }
 240
 241         if (!len)
 242                 return;
 243
 244         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 245         header = IHDR(inode, raw_inode);
 246         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 247                                             EXT4_I(inode)->i_inline_off);
 248
 249         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 250                buffer, len);
 251 }
 252
 253 static int ext4_create_inline_data(handle_t *handle,
 254                                    struct inode *inode, unsigned len)
 255 {
 256         int error;
 257         void *value = NULL;
 258         struct ext4_xattr_ibody_find is = {
 259                 .s = { .not_found = -ENODATA, },
 260         };
 261         struct ext4_xattr_info i = {
 262                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 263                 .name = EXT4_XATTR_SYSTEM_DATA,
 264         };
 265
 266         error = ext4_get_inode_loc(inode, &is.iloc);
 267         if (error)
 268                 return error;
 269
 270         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 271         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 272                                               EXT4_JTR_NONE);
 273         if (error)
 274                 goto out;
 275
 276         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 277                 value = EXT4_ZERO_XATTR_VALUE;
 278                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 279         } else {
 280                 value = "";
 281                 len = 0;
 282         }
 283
 284         /* Insert the xttr entry. */
 285         i.value = value;
 286         i.value_len = len;
 287
 288         error = ext4_xattr_ibody_find(inode, &i, &is);
 289         if (error)
 290                 goto out;
 291
 292         BUG_ON(!is.s.not_found);
 293
 294         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 295         if (error) {
 296                 if (error == -ENOSPC)
 297                         ext4_clear_inode_state(inode,
 298                                                EXT4_STATE_MAY_INLINE_DATA);
 299                 goto out;
 300         }
 301
 302         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 303                 0, EXT4_MIN_INLINE_DATA_SIZE);
 304
 305         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 306                                       (void *)ext4_raw_inode(&is.iloc));
 307         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 308         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 309         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 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, inode->i_sb, is.iloc.bh,
 359                                               EXT4_JTR_NONE);
 360         if (error)
 361                 goto out;
 362
 363         /* Update the xattr entry. */
 364         i.value = value;
 365         i.value_len = len;
 366
 367         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 368         if (error)
 369                 goto out;
 370
 371         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 372                                       (void *)ext4_raw_inode(&is.iloc));
 373         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 374                                 le32_to_cpu(is.s.here->e_value_size);
 375         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 376         get_bh(is.iloc.bh);
 377         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 378
 379 out:
 380         kfree(value);
 381         brelse(is.iloc.bh);
 382         return error;
 383 }
 384
 385 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 386                                     unsigned int len)
 387 {
 388         int ret, size, no_expand;
 389         struct ext4_inode_info *ei = EXT4_I(inode);
 390
 391         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 392                 return -ENOSPC;
 393
 394         size = ext4_get_max_inline_size(inode);
 395         if (size < len)
 396                 return -ENOSPC;
 397
 398         ext4_write_lock_xattr(inode, &no_expand);
 399
 400         if (ei->i_inline_off)
 401                 ret = ext4_update_inline_data(handle, inode, len);
 402         else
 403                 ret = ext4_create_inline_data(handle, inode, len);
 404
 405         ext4_write_unlock_xattr(inode, &no_expand);
 406         return ret;
 407 }
 408
 409 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 410                                            struct inode *inode)
 411 {
 412         struct ext4_inode_info *ei = EXT4_I(inode);
 413         struct ext4_xattr_ibody_find is = {
 414                 .s = { .not_found = 0, },
 415         };
 416         struct ext4_xattr_info i = {
 417                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 418                 .name = EXT4_XATTR_SYSTEM_DATA,
 419                 .value = NULL,
 420                 .value_len = 0,
 421         };
 422         int error;
 423
 424         if (!ei->i_inline_off)
 425                 return 0;
 426
 427         error = ext4_get_inode_loc(inode, &is.iloc);
 428         if (error)
 429                 return error;
 430
 431         error = ext4_xattr_ibody_find(inode, &i, &is);
 432         if (error)
 433                 goto out;
 434
 435         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 436         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 437                                               EXT4_JTR_NONE);
 438         if (error)
 439                 goto out;
 440
 441         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 442         if (error)
 443                 goto out;
 444
 445         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 446                 0, EXT4_MIN_INLINE_DATA_SIZE);
 447         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 448
 449         if (ext4_has_feature_extents(inode->i_sb)) {
 450                 if (S_ISDIR(inode->i_mode) ||
 451                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 452                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 453                         ext4_ext_tree_init(handle, inode);
 454                 }
 455         }
 456         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 457
 458         get_bh(is.iloc.bh);
 459         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 460
 461         EXT4_I(inode)->i_inline_off = 0;
 462         EXT4_I(inode)->i_inline_size = 0;
 463         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 464 out:
 465         brelse(is.iloc.bh);
 466         if (error == -ENODATA)
 467                 error = 0;
 468         return error;
 469 }
 470
 471 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 472 {
 473         void *kaddr;
 474         int ret = 0;
 475         size_t len;
 476         struct ext4_iloc iloc;
 477
 478         BUG_ON(!PageLocked(page));
 479         BUG_ON(!ext4_has_inline_data(inode));
 480         BUG_ON(page->index);
 481
 482         if (!EXT4_I(inode)->i_inline_off) {
 483                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 484                              inode->i_ino);
 485                 goto out;
 486         }
 487
 488         ret = ext4_get_inode_loc(inode, &iloc);
 489         if (ret)
 490                 goto out;
 491
 492         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 493         kaddr = kmap_atomic(page);
 494         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 495         flush_dcache_page(page);
 496         kunmap_atomic(kaddr);
 497         zero_user_segment(page, len, PAGE_SIZE);
 498         SetPageUptodate(page);
 499         brelse(iloc.bh);
 500
 501 out:
 502         return ret;
 503 }
 504
 505 int ext4_readpage_inline(struct inode *inode, struct page *page)
 506 {
 507         int ret = 0;
 508
 509         down_read(&EXT4_I(inode)->xattr_sem);
 510         if (!ext4_has_inline_data(inode)) {
 511                 up_read(&EXT4_I(inode)->xattr_sem);
 512                 return -EAGAIN;
 513         }
 514
 515         /*
 516          * Current inline data can only exist in the 1st page,
 517          * So for all the other pages, just set them uptodate.
 518          */
 519         if (!page->index)
 520                 ret = ext4_read_inline_page(inode, page);
 521         else if (!PageUptodate(page)) {
 522                 zero_user_segment(page, 0, PAGE_SIZE);
 523                 SetPageUptodate(page);
 524         }
 525
 526         up_read(&EXT4_I(inode)->xattr_sem);
 527
 528         unlock_page(page);
 529         return ret >= 0 ? 0 : ret;
 530 }
 531
 532 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 533                                               struct inode *inode)
 534 {
 535         int ret, needed_blocks, no_expand;
 536         handle_t *handle = NULL;
 537         int retries = 0, sem_held = 0;
 538         struct page *page = NULL;
 539         unsigned int flags;
 540         unsigned from, to;
 541         struct ext4_iloc iloc;
 542
 543         if (!ext4_has_inline_data(inode)) {
 544                 /*
 545                  * clear the flag so that no new write
 546                  * will trap here again.
 547                  */
 548                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 549                 return 0;
 550         }
 551
 552         needed_blocks = ext4_writepage_trans_blocks(inode);
 553
 554         ret = ext4_get_inode_loc(inode, &iloc);
 555         if (ret)
 556                 return ret;
 557
 558 retry:
 559         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 560         if (IS_ERR(handle)) {
 561                 ret = PTR_ERR(handle);
 562                 handle = NULL;
 563                 goto out;
 564         }
 565
 566         /* We cannot recurse into the filesystem as the transaction is already
 567          * started */
 568         flags = memalloc_nofs_save();
 569         page = grab_cache_page_write_begin(mapping, 0);
 570         memalloc_nofs_restore(flags);
 571         if (!page) {
 572                 ret = -ENOMEM;
 573                 goto out;
 574         }
 575
 576         ext4_write_lock_xattr(inode, &no_expand);
 577         sem_held = 1;
 578         /* If some one has already done this for us, just exit. */
 579         if (!ext4_has_inline_data(inode)) {
 580                 ret = 0;
 581                 goto out;
 582         }
 583
 584         from = 0;
 585         to = ext4_get_inline_size(inode);
 586         if (!PageUptodate(page)) {
 587                 ret = ext4_read_inline_page(inode, page);
 588                 if (ret < 0)
 589                         goto out;
 590         }
 591
 592         ret = ext4_destroy_inline_data_nolock(handle, inode);
 593         if (ret)
 594                 goto out;
 595
 596         if (ext4_should_dioread_nolock(inode)) {
 597                 ret = __block_write_begin(page, from, to,
 598                                           ext4_get_block_unwritten);
 599         } else
 600                 ret = __block_write_begin(page, from, to, ext4_get_block);
 601
 602         if (!ret && ext4_should_journal_data(inode)) {
 603                 ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
 604                                              from, to, NULL,
 605                                              do_journal_get_write_access);
 606         }
 607
 608         if (ret) {
 609                 unlock_page(page);
 610                 put_page(page);
 611                 page = NULL;
 612                 ext4_orphan_add(handle, inode);
 613                 ext4_write_unlock_xattr(inode, &no_expand);
 614                 sem_held = 0;
 615                 ext4_journal_stop(handle);
 616                 handle = NULL;
 617                 ext4_truncate_failed_write(inode);
 618                 /*
 619                  * If truncate failed early the inode might
 620                  * still be on the orphan list; we need to
 621                  * make sure the inode is removed from the
 622                  * orphan list in that case.
 623                  */
 624                 if (inode->i_nlink)
 625                         ext4_orphan_del(NULL, inode);
 626         }
 627
 628         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 629                 goto retry;
 630
 631         if (page)
 632                 block_commit_write(page, from, to);
 633 out:
 634         if (page) {
 635                 unlock_page(page);
 636                 put_page(page);
 637         }
 638         if (sem_held)
 639                 ext4_write_unlock_xattr(inode, &no_expand);
 640         if (handle)
 641                 ext4_journal_stop(handle);
 642         brelse(iloc.bh);
 643         return ret;
 644 }
 645
 646 /*
 647  * Try to write data in the inode.
 648  * If the inode has inline data, check whether the new write can be
 649  * in the inode also. If not, create the page the handle, move the data
 650  * to the page make it update and let the later codes create extent for it.
 651  */
 652 int ext4_try_to_write_inline_data(struct address_space *mapping,
 653                                   struct inode *inode,
 654                                   loff_t pos, unsigned len,
 655                                   struct page **pagep)
 656 {
 657         int ret;
 658         handle_t *handle;
 659         unsigned int flags;
 660         struct page *page;
 661         struct ext4_iloc iloc;
 662
 663         if (pos + len > ext4_get_max_inline_size(inode))
 664                 goto convert;
 665
 666         ret = ext4_get_inode_loc(inode, &iloc);
 667         if (ret)
 668                 return ret;
 669
 670         /*
 671          * The possible write could happen in the inode,
 672          * so try to reserve the space in inode first.
 673          */
 674         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 675         if (IS_ERR(handle)) {
 676                 ret = PTR_ERR(handle);
 677                 handle = NULL;
 678                 goto out;
 679         }
 680
 681         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 682         if (ret && ret != -ENOSPC)
 683                 goto out;
 684
 685         /* We don't have space in inline inode, so convert it to extent. */
 686         if (ret == -ENOSPC) {
 687                 ext4_journal_stop(handle);
 688                 brelse(iloc.bh);
 689                 goto convert;
 690         }
 691
 692         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 693                                             EXT4_JTR_NONE);
 694         if (ret)
 695                 goto out;
 696
 697         flags = memalloc_nofs_save();
 698         page = grab_cache_page_write_begin(mapping, 0);
 699         memalloc_nofs_restore(flags);
 700         if (!page) {
 701                 ret = -ENOMEM;
 702                 goto out;
 703         }
 704
 705         *pagep = page;
 706         down_read(&EXT4_I(inode)->xattr_sem);
 707         if (!ext4_has_inline_data(inode)) {
 708                 ret = 0;
 709                 unlock_page(page);
 710                 put_page(page);
 711                 goto out_up_read;
 712         }
 713
 714         if (!PageUptodate(page)) {
 715                 ret = ext4_read_inline_page(inode, page);
 716                 if (ret < 0) {
 717                         unlock_page(page);
 718                         put_page(page);
 719                         goto out_up_read;
 720                 }
 721         }
 722
 723         ret = 1;
 724         handle = NULL;
 725 out_up_read:
 726         up_read(&EXT4_I(inode)->xattr_sem);
 727 out:
 728         if (handle && (ret != 1))
 729                 ext4_journal_stop(handle);
 730         brelse(iloc.bh);
 731         return ret;
 732 convert:
 733         return ext4_convert_inline_data_to_extent(mapping, inode);
 734 }
 735
 736 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 737                                unsigned copied, struct page *page)
 738 {
 739         handle_t *handle = ext4_journal_current_handle();
 740         int no_expand;
 741         void *kaddr;
 742         struct ext4_iloc iloc;
 743         int ret = 0, ret2;
 744
 745         if (unlikely(copied < len) && !PageUptodate(page))
 746                 copied = 0;
 747
 748         if (likely(copied)) {
 749                 ret = ext4_get_inode_loc(inode, &iloc);
 750                 if (ret) {
 751                         unlock_page(page);
 752                         put_page(page);
 753                         ext4_std_error(inode->i_sb, ret);
 754                         goto out;
 755                 }
 756                 ext4_write_lock_xattr(inode, &no_expand);
 757                 BUG_ON(!ext4_has_inline_data(inode));
 758
 759                 /*
 760                  * ei->i_inline_off may have changed since
 761                  * ext4_write_begin() called
 762                  * ext4_try_to_write_inline_data()
 763                  */
 764                 (void) ext4_find_inline_data_nolock(inode);
 765
 766                 kaddr = kmap_atomic(page);
 767                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 768                 kunmap_atomic(kaddr);
 769                 SetPageUptodate(page);
 770                 /* clear page dirty so that writepages wouldn't work for us. */
 771                 ClearPageDirty(page);
 772
 773                 ext4_write_unlock_xattr(inode, &no_expand);
 774                 brelse(iloc.bh);
 775
 776                 /*
 777                  * It's important to update i_size while still holding page
 778                  * lock: page writeout could otherwise come in and zero
 779                  * beyond i_size.
 780                  */
 781                 ext4_update_inode_size(inode, pos + copied);
 782         }
 783         unlock_page(page);
 784         put_page(page);
 785
 786         /*
 787          * Don't mark the inode dirty under page lock. First, it unnecessarily
 788          * makes the holding time of page lock longer. Second, it forces lock
 789          * ordering of page lock and transaction start for journaling
 790          * filesystems.
 791          */
 792         if (likely(copied))
 793                 mark_inode_dirty(inode);
 794 out:
 795         /*
 796          * If we didn't copy as much data as expected, we need to trim back
 797          * size of xattr containing inline data.
 798          */
 799         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 800                 ext4_orphan_add(handle, inode);
 801
 802         ret2 = ext4_journal_stop(handle);
 803         if (!ret)
 804                 ret = ret2;
 805         if (pos + len > inode->i_size) {
 806                 ext4_truncate_failed_write(inode);
 807                 /*
 808                  * If truncate failed early the inode might still be
 809                  * on the orphan list; we need to make sure the inode
 810                  * is removed from the orphan list in that case.
 811                  */
 812                 if (inode->i_nlink)
 813                         ext4_orphan_del(NULL, inode);
 814         }
 815         return ret ? ret : copied;
 816 }
 817
 818 struct buffer_head *
 819 ext4_journalled_write_inline_data(struct inode *inode,
 820                                   unsigned len,
 821                                   struct page *page)
 822 {
 823         int ret, no_expand;
 824         void *kaddr;
 825         struct ext4_iloc iloc;
 826
 827         ret = ext4_get_inode_loc(inode, &iloc);
 828         if (ret) {
 829                 ext4_std_error(inode->i_sb, ret);
 830                 return NULL;
 831         }
 832
 833         ext4_write_lock_xattr(inode, &no_expand);
 834         kaddr = kmap_atomic(page);
 835         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 836         kunmap_atomic(kaddr);
 837         ext4_write_unlock_xattr(inode, &no_expand);
 838
 839         return iloc.bh;
 840 }
 841
 842 /*
 843  * Try to make the page cache and handle ready for the inline data case.
 844  * We can call this function in 2 cases:
 845  * 1. The inode is created and the first write exceeds inline size. We can
 846  *    clear the inode state safely.
 847  * 2. The inode has inline data, then we need to read the data, make it
 848  *    update and dirty so that ext4_da_writepages can handle it. We don't
 849  *    need to start the journal since the file's metadata isn't changed now.
 850  */
 851 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 852                                                  struct inode *inode,
 853                                                  void **fsdata)
 854 {
 855         int ret = 0, inline_size;
 856         struct page *page;
 857
 858         page = grab_cache_page_write_begin(mapping, 0);
 859         if (!page)
 860                 return -ENOMEM;
 861
 862         down_read(&EXT4_I(inode)->xattr_sem);
 863         if (!ext4_has_inline_data(inode)) {
 864                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 865                 goto out;
 866         }
 867
 868         inline_size = ext4_get_inline_size(inode);
 869
 870         if (!PageUptodate(page)) {
 871                 ret = ext4_read_inline_page(inode, page);
 872                 if (ret < 0)
 873                         goto out;
 874         }
 875
 876         ret = __block_write_begin(page, 0, inline_size,
 877                                   ext4_da_get_block_prep);
 878         if (ret) {
 879                 up_read(&EXT4_I(inode)->xattr_sem);
 880                 unlock_page(page);
 881                 put_page(page);
 882                 ext4_truncate_failed_write(inode);
 883                 return ret;
 884         }
 885
 886         SetPageDirty(page);
 887         SetPageUptodate(page);
 888         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 889         *fsdata = (void *)CONVERT_INLINE_DATA;
 890
 891 out:
 892         up_read(&EXT4_I(inode)->xattr_sem);
 893         if (page) {
 894                 unlock_page(page);
 895                 put_page(page);
 896         }
 897         return ret;
 898 }
 899
 900 /*
 901  * Prepare the write for the inline data.
 902  * If the data can be written into the inode, we just read
 903  * the page and make it uptodate, and start the journal.
 904  * Otherwise read the page, makes it dirty so that it can be
 905  * handle in writepages(the i_disksize update is left to the
 906  * normal ext4_da_write_end).
 907  */
 908 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 909                                     struct inode *inode,
 910                                     loff_t pos, unsigned len,
 911                                     struct page **pagep,
 912                                     void **fsdata)
 913 {
 914         int ret;
 915         handle_t *handle;
 916         struct page *page;
 917         struct ext4_iloc iloc;
 918         int retries = 0;
 919         unsigned int flags;
 920
 921         ret = ext4_get_inode_loc(inode, &iloc);
 922         if (ret)
 923                 return ret;
 924
 925 retry_journal:
 926         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 927         if (IS_ERR(handle)) {
 928                 ret = PTR_ERR(handle);
 929                 goto out;
 930         }
 931
 932         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 933         if (ret && ret != -ENOSPC)
 934                 goto out_journal;
 935
 936         if (ret == -ENOSPC) {
 937                 ext4_journal_stop(handle);
 938                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 939                                                             inode,
 940                                                             fsdata);
 941                 if (ret == -ENOSPC &&
 942                     ext4_should_retry_alloc(inode->i_sb, &retries))
 943                         goto retry_journal;
 944                 goto out;
 945         }
 946
 947         /*
 948          * We cannot recurse into the filesystem as the transaction
 949          * is already started.
 950          */
 951         flags = memalloc_nofs_save();
 952         page = grab_cache_page_write_begin(mapping, 0);
 953         memalloc_nofs_restore(flags);
 954         if (!page) {
 955                 ret = -ENOMEM;
 956                 goto out_journal;
 957         }
 958
 959         down_read(&EXT4_I(inode)->xattr_sem);
 960         if (!ext4_has_inline_data(inode)) {
 961                 ret = 0;
 962                 goto out_release_page;
 963         }
 964
 965         if (!PageUptodate(page)) {
 966                 ret = ext4_read_inline_page(inode, page);
 967                 if (ret < 0)
 968                         goto out_release_page;
 969         }
 970         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 971                                             EXT4_JTR_NONE);
 972         if (ret)
 973                 goto out_release_page;
 974
 975         up_read(&EXT4_I(inode)->xattr_sem);
 976         *pagep = page;
 977         brelse(iloc.bh);
 978         return 1;
 979 out_release_page:
 980         up_read(&EXT4_I(inode)->xattr_sem);
 981         unlock_page(page);
 982         put_page(page);
 983 out_journal:
 984         ext4_journal_stop(handle);
 985 out:
 986         brelse(iloc.bh);
 987         return ret;
 988 }
 989
 990 #ifdef INLINE_DIR_DEBUG
 991 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 992                           void *inline_start, int inline_size)
 993 {
 994         int offset;
 995         unsigned short de_len;
 996         struct ext4_dir_entry_2 *de = inline_start;
 997         void *dlimit = inline_start + inline_size;
 998
 999         trace_printk("inode %lu\n", dir->i_ino);
1000         offset = 0;
1001         while ((void *)de < dlimit) {
1002                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1003                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1004                              offset, de_len, de->name_len, de->name,
1005                              de->name_len, le32_to_cpu(de->inode));
1006                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1007                                          inline_start, inline_size, offset))
1008                         BUG();
1009
1010                 offset += de_len;
1011                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1012         }
1013 }
1014 #else
1015 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1016 #endif
1017
1018 /*
1019  * Add a new entry into a inline dir.
1020  * It will return -ENOSPC if no space is available, and -EIO
1021  * and -EEXIST if directory entry already exists.
1022  */
1023 static int ext4_add_dirent_to_inline(handle_t *handle,
1024                                      struct ext4_filename *fname,
1025                                      struct inode *dir,
1026                                      struct inode *inode,
1027                                      struct ext4_iloc *iloc,
1028                                      void *inline_start, int inline_size)
1029 {
1030         int             err;
1031         struct ext4_dir_entry_2 *de;
1032
1033         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1034                                 inline_size, fname, &de);
1035         if (err)
1036                 return err;
1037
1038         BUFFER_TRACE(iloc->bh, "get_write_access");
1039         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1040                                             EXT4_JTR_NONE);
1041         if (err)
1042                 return err;
1043         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1044
1045         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1046
1047         /*
1048          * XXX shouldn't update any times until successful
1049          * completion of syscall, but too many callers depend
1050          * on this.
1051          *
1052          * XXX similarly, too many callers depend on
1053          * ext4_new_inode() setting the times, but error
1054          * recovery deletes the inode, so the worst that can
1055          * happen is that the times are slightly out of date
1056          * and/or different from the directory change time.
1057          */
1058         dir->i_mtime = dir->i_ctime = current_time(dir);
1059         ext4_update_dx_flag(dir);
1060         inode_inc_iversion(dir);
1061         return 1;
1062 }
1063
1064 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1065                                        struct ext4_iloc *iloc)
1066 {
1067         struct ext4_xattr_entry *entry;
1068         struct ext4_xattr_ibody_header *header;
1069
1070         BUG_ON(!EXT4_I(inode)->i_inline_off);
1071
1072         header = IHDR(inode, ext4_raw_inode(iloc));
1073         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1074                                             EXT4_I(inode)->i_inline_off);
1075
1076         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1077 }
1078
1079 /* Set the final de to cover the whole block. */
1080 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1081 {
1082         struct ext4_dir_entry_2 *de, *prev_de;
1083         void *limit;
1084         int de_len;
1085
1086         de = de_buf;
1087         if (old_size) {
1088                 limit = de_buf + old_size;
1089                 do {
1090                         prev_de = de;
1091                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1092                         de_buf += de_len;
1093                         de = de_buf;
1094                 } while (de_buf < limit);
1095
1096                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1097                                                         old_size, new_size);
1098         } else {
1099                 /* this is just created, so create an empty entry. */
1100                 de->inode = 0;
1101                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1102         }
1103 }
1104
1105 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1106                                   struct ext4_iloc *iloc)
1107 {
1108         int ret;
1109         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1110         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1111
1112         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1113                 return -ENOSPC;
1114
1115         ret = ext4_update_inline_data(handle, dir,
1116                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1117         if (ret)
1118                 return ret;
1119
1120         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1121                              EXT4_I(dir)->i_inline_size -
1122                                                 EXT4_MIN_INLINE_DATA_SIZE);
1123         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1124         return 0;
1125 }
1126
1127 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1128                                      struct ext4_iloc *iloc,
1129                                      void *buf, int inline_size)
1130 {
1131         int ret;
1132
1133         ret = ext4_create_inline_data(handle, inode, inline_size);
1134         if (ret) {
1135                 ext4_msg(inode->i_sb, KERN_EMERG,
1136                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1137                         inode->i_ino, ret);
1138                 return;
1139         }
1140         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1141         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1142 }
1143
1144 static int ext4_finish_convert_inline_dir(handle_t *handle,
1145                                           struct inode *inode,
1146                                           struct buffer_head *dir_block,
1147                                           void *buf,
1148                                           int inline_size)
1149 {
1150         int err, csum_size = 0, header_size = 0;
1151         struct ext4_dir_entry_2 *de;
1152         void *target = dir_block->b_data;
1153
1154         /*
1155          * First create "." and ".." and then copy the dir information
1156          * back to the block.
1157          */
1158         de = target;
1159         de = ext4_init_dot_dotdot(inode, de,
1160                 inode->i_sb->s_blocksize, csum_size,
1161                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1162         header_size = (void *)de - target;
1163
1164         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1165                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1166
1167         if (ext4_has_metadata_csum(inode->i_sb))
1168                 csum_size = sizeof(struct ext4_dir_entry_tail);
1169
1170         inode->i_size = inode->i_sb->s_blocksize;
1171         i_size_write(inode, inode->i_sb->s_blocksize);
1172         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1173         ext4_update_final_de(dir_block->b_data,
1174                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1175                         inode->i_sb->s_blocksize - csum_size);
1176
1177         if (csum_size)
1178                 ext4_initialize_dirent_tail(dir_block,
1179                                             inode->i_sb->s_blocksize);
1180         set_buffer_uptodate(dir_block);
1181         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1182         if (err)
1183                 return err;
1184         set_buffer_verified(dir_block);
1185         return ext4_mark_inode_dirty(handle, inode);
1186 }
1187
1188 static int ext4_convert_inline_data_nolock(handle_t *handle,
1189                                            struct inode *inode,
1190                                            struct ext4_iloc *iloc)
1191 {
1192         int error;
1193         void *buf = NULL;
1194         struct buffer_head *data_bh = NULL;
1195         struct ext4_map_blocks map;
1196         int inline_size;
1197
1198         inline_size = ext4_get_inline_size(inode);
1199         buf = kmalloc(inline_size, GFP_NOFS);
1200         if (!buf) {
1201                 error = -ENOMEM;
1202                 goto out;
1203         }
1204
1205         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1206         if (error < 0)
1207                 goto out;
1208
1209         /*
1210          * Make sure the inline directory entries pass checks before we try to
1211          * convert them, so that we avoid touching stuff that needs fsck.
1212          */
1213         if (S_ISDIR(inode->i_mode)) {
1214                 error = ext4_check_all_de(inode, iloc->bh,
1215                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1216                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1217                 if (error)
1218                         goto out;
1219         }
1220
1221         error = ext4_destroy_inline_data_nolock(handle, inode);
1222         if (error)
1223                 goto out;
1224
1225         map.m_lblk = 0;
1226         map.m_len = 1;
1227         map.m_flags = 0;
1228         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1229         if (error < 0)
1230                 goto out_restore;
1231         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1232                 error = -EIO;
1233                 goto out_restore;
1234         }
1235
1236         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1237         if (!data_bh) {
1238                 error = -ENOMEM;
1239                 goto out_restore;
1240         }
1241
1242         lock_buffer(data_bh);
1243         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1244                                                EXT4_JTR_NONE);
1245         if (error) {
1246                 unlock_buffer(data_bh);
1247                 error = -EIO;
1248                 goto out_restore;
1249         }
1250         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1251
1252         if (!S_ISDIR(inode->i_mode)) {
1253                 memcpy(data_bh->b_data, buf, inline_size);
1254                 set_buffer_uptodate(data_bh);
1255                 error = ext4_handle_dirty_metadata(handle,
1256                                                    inode, data_bh);
1257         } else {
1258                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1259                                                        buf, inline_size);
1260         }
1261
1262         unlock_buffer(data_bh);
1263 out_restore:
1264         if (error)
1265                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1266
1267 out:
1268         brelse(data_bh);
1269         kfree(buf);
1270         return error;
1271 }
1272
1273 /*
1274  * Try to add the new entry to the inline data.
1275  * If succeeds, return 0. If not, extended the inline dir and copied data to
1276  * the new created block.
1277  */
1278 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1279                               struct inode *dir, struct inode *inode)
1280 {
1281         int ret, ret2, inline_size, no_expand;
1282         void *inline_start;
1283         struct ext4_iloc iloc;
1284
1285         ret = ext4_get_inode_loc(dir, &iloc);
1286         if (ret)
1287                 return ret;
1288
1289         ext4_write_lock_xattr(dir, &no_expand);
1290         if (!ext4_has_inline_data(dir))
1291                 goto out;
1292
1293         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1294                                                  EXT4_INLINE_DOTDOT_SIZE;
1295         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1296
1297         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1298                                         inline_start, inline_size);
1299         if (ret != -ENOSPC)
1300                 goto out;
1301
1302         /* check whether it can be inserted to inline xattr space. */
1303         inline_size = EXT4_I(dir)->i_inline_size -
1304                         EXT4_MIN_INLINE_DATA_SIZE;
1305         if (!inline_size) {
1306                 /* Try to use the xattr space.*/
1307                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1308                 if (ret && ret != -ENOSPC)
1309                         goto out;
1310
1311                 inline_size = EXT4_I(dir)->i_inline_size -
1312                                 EXT4_MIN_INLINE_DATA_SIZE;
1313         }
1314
1315         if (inline_size) {
1316                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1317
1318                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1319                                                 inode, &iloc, inline_start,
1320                                                 inline_size);
1321
1322                 if (ret != -ENOSPC)
1323                         goto out;
1324         }
1325
1326         /*
1327          * The inline space is filled up, so create a new block for it.
1328          * As the extent tree will be created, we have to save the inline
1329          * dir first.
1330          */
1331         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1332
1333 out:
1334         ext4_write_unlock_xattr(dir, &no_expand);
1335         ret2 = ext4_mark_inode_dirty(handle, dir);
1336         if (unlikely(ret2 && !ret))
1337                 ret = ret2;
1338         brelse(iloc.bh);
1339         return ret;
1340 }
1341
1342 /*
1343  * This function fills a red-black tree with information from an
1344  * inlined dir.  It returns the number directory entries loaded
1345  * into the tree.  If there is an error it is returned in err.
1346  */
1347 int ext4_inlinedir_to_tree(struct file *dir_file,
1348                            struct inode *dir, ext4_lblk_t block,
1349                            struct dx_hash_info *hinfo,
1350                            __u32 start_hash, __u32 start_minor_hash,
1351                            int *has_inline_data)
1352 {
1353         int err = 0, count = 0;
1354         unsigned int parent_ino;
1355         int pos;
1356         struct ext4_dir_entry_2 *de;
1357         struct inode *inode = file_inode(dir_file);
1358         int ret, inline_size = 0;
1359         struct ext4_iloc iloc;
1360         void *dir_buf = NULL;
1361         struct ext4_dir_entry_2 fake;
1362         struct fscrypt_str tmp_str;
1363
1364         ret = ext4_get_inode_loc(inode, &iloc);
1365         if (ret)
1366                 return ret;
1367
1368         down_read(&EXT4_I(inode)->xattr_sem);
1369         if (!ext4_has_inline_data(inode)) {
1370                 up_read(&EXT4_I(inode)->xattr_sem);
1371                 *has_inline_data = 0;
1372                 goto out;
1373         }
1374
1375         inline_size = ext4_get_inline_size(inode);
1376         dir_buf = kmalloc(inline_size, GFP_NOFS);
1377         if (!dir_buf) {
1378                 ret = -ENOMEM;
1379                 up_read(&EXT4_I(inode)->xattr_sem);
1380                 goto out;
1381         }
1382
1383         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1384         up_read(&EXT4_I(inode)->xattr_sem);
1385         if (ret < 0)
1386                 goto out;
1387
1388         pos = 0;
1389         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1390         while (pos < inline_size) {
1391                 /*
1392                  * As inlined dir doesn't store any information about '.' and
1393                  * only the inode number of '..' is stored, we have to handle
1394                  * them differently.
1395                  */
1396                 if (pos == 0) {
1397                         fake.inode = cpu_to_le32(inode->i_ino);
1398                         fake.name_len = 1;
1399                         strcpy(fake.name, ".");
1400                         fake.rec_len = ext4_rec_len_to_disk(
1401                                           ext4_dir_rec_len(fake.name_len, NULL),
1402                                           inline_size);
1403                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1404                         de = &fake;
1405                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1406                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1407                         fake.inode = cpu_to_le32(parent_ino);
1408                         fake.name_len = 2;
1409                         strcpy(fake.name, "..");
1410                         fake.rec_len = ext4_rec_len_to_disk(
1411                                           ext4_dir_rec_len(fake.name_len, NULL),
1412                                           inline_size);
1413                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1414                         de = &fake;
1415                         pos = EXT4_INLINE_DOTDOT_SIZE;
1416                 } else {
1417                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1418                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1419                         if (ext4_check_dir_entry(inode, dir_file, de,
1420                                          iloc.bh, dir_buf,
1421                                          inline_size, pos)) {
1422                                 ret = count;
1423                                 goto out;
1424                         }
1425                 }
1426
1427                 if (ext4_hash_in_dirent(dir)) {
1428                         hinfo->hash = EXT4_DIRENT_HASH(de);
1429                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1430                 } else {
1431                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1432                 }
1433                 if ((hinfo->hash < start_hash) ||
1434                     ((hinfo->hash == start_hash) &&
1435                      (hinfo->minor_hash < start_minor_hash)))
1436                         continue;
1437                 if (de->inode == 0)
1438                         continue;
1439                 tmp_str.name = de->name;
1440                 tmp_str.len = de->name_len;
1441                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1442                                               hinfo->minor_hash, de, &tmp_str);
1443                 if (err) {
1444                         ret = err;
1445                         goto out;
1446                 }
1447                 count++;
1448         }
1449         ret = count;
1450 out:
1451         kfree(dir_buf);
1452         brelse(iloc.bh);
1453         return ret;
1454 }
1455
1456 /*
1457  * So this function is called when the volume is mkfsed with
1458  * dir_index disabled. In order to keep f_pos persistent
1459  * after we convert from an inlined dir to a blocked based,
1460  * we just pretend that we are a normal dir and return the
1461  * offset as if '.' and '..' really take place.
1462  *
1463  */
1464 int ext4_read_inline_dir(struct file *file,
1465                          struct dir_context *ctx,
1466                          int *has_inline_data)
1467 {
1468         unsigned int offset, parent_ino;
1469         int i;
1470         struct ext4_dir_entry_2 *de;
1471         struct super_block *sb;
1472         struct inode *inode = file_inode(file);
1473         int ret, inline_size = 0;
1474         struct ext4_iloc iloc;
1475         void *dir_buf = NULL;
1476         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1477
1478         ret = ext4_get_inode_loc(inode, &iloc);
1479         if (ret)
1480                 return ret;
1481
1482         down_read(&EXT4_I(inode)->xattr_sem);
1483         if (!ext4_has_inline_data(inode)) {
1484                 up_read(&EXT4_I(inode)->xattr_sem);
1485                 *has_inline_data = 0;
1486                 goto out;
1487         }
1488
1489         inline_size = ext4_get_inline_size(inode);
1490         dir_buf = kmalloc(inline_size, GFP_NOFS);
1491         if (!dir_buf) {
1492                 ret = -ENOMEM;
1493                 up_read(&EXT4_I(inode)->xattr_sem);
1494                 goto out;
1495         }
1496
1497         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1498         up_read(&EXT4_I(inode)->xattr_sem);
1499         if (ret < 0)
1500                 goto out;
1501
1502         ret = 0;
1503         sb = inode->i_sb;
1504         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1505         offset = ctx->pos;
1506
1507         /*
1508          * dotdot_offset and dotdot_size is the real offset and
1509          * size for ".." and "." if the dir is block based while
1510          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1511          * So we will use extra_offset and extra_size to indicate them
1512          * during the inline dir iteration.
1513          */
1514         dotdot_offset = ext4_dir_rec_len(1, NULL);
1515         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1516         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1517         extra_size = extra_offset + inline_size;
1518
1519         /*
1520          * If the version has changed since the last call to
1521          * readdir(2), then we might be pointing to an invalid
1522          * dirent right now.  Scan from the start of the inline
1523          * dir to make sure.
1524          */
1525         if (!inode_eq_iversion(inode, file->f_version)) {
1526                 for (i = 0; i < extra_size && i < offset;) {
1527                         /*
1528                          * "." is with offset 0 and
1529                          * ".." is dotdot_offset.
1530                          */
1531                         if (!i) {
1532                                 i = dotdot_offset;
1533                                 continue;
1534                         } else if (i == dotdot_offset) {
1535                                 i = dotdot_size;
1536                                 continue;
1537                         }
1538                         /* for other entry, the real offset in
1539                          * the buf has to be tuned accordingly.
1540                          */
1541                         de = (struct ext4_dir_entry_2 *)
1542                                 (dir_buf + i - extra_offset);
1543                         /* It's too expensive to do a full
1544                          * dirent test each time round this
1545                          * loop, but we do have to test at
1546                          * least that it is non-zero.  A
1547                          * failure will be detected in the
1548                          * dirent test below. */
1549                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1550                                 < ext4_dir_rec_len(1, NULL))
1551                                 break;
1552                         i += ext4_rec_len_from_disk(de->rec_len,
1553                                                     extra_size);
1554                 }
1555                 offset = i;
1556                 ctx->pos = offset;
1557                 file->f_version = inode_query_iversion(inode);
1558         }
1559
1560         while (ctx->pos < extra_size) {
1561                 if (ctx->pos == 0) {
1562                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1563                                 goto out;
1564                         ctx->pos = dotdot_offset;
1565                         continue;
1566                 }
1567
1568                 if (ctx->pos == dotdot_offset) {
1569                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1570                                 goto out;
1571                         ctx->pos = dotdot_size;
1572                         continue;
1573                 }
1574
1575                 de = (struct ext4_dir_entry_2 *)
1576                         (dir_buf + ctx->pos - extra_offset);
1577                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1578                                          extra_size, ctx->pos))
1579                         goto out;
1580                 if (le32_to_cpu(de->inode)) {
1581                         if (!dir_emit(ctx, de->name, de->name_len,
1582                                       le32_to_cpu(de->inode),
1583                                       get_dtype(sb, de->file_type)))
1584                                 goto out;
1585                 }
1586                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1587         }
1588 out:
1589         kfree(dir_buf);
1590         brelse(iloc.bh);
1591         return ret;
1592 }
1593
1594 void *ext4_read_inline_link(struct inode *inode)
1595 {
1596         struct ext4_iloc iloc;
1597         int ret, inline_size;
1598         void *link;
1599
1600         ret = ext4_get_inode_loc(inode, &iloc);
1601         if (ret)
1602                 return ERR_PTR(ret);
1603
1604         ret = -ENOMEM;
1605         inline_size = ext4_get_inline_size(inode);
1606         link = kmalloc(inline_size + 1, GFP_NOFS);
1607         if (!link)
1608                 goto out;
1609
1610         ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1611         if (ret < 0) {
1612                 kfree(link);
1613                 goto out;
1614         }
1615         nd_terminate_link(link, inode->i_size, ret);
1616 out:
1617         if (ret < 0)
1618                 link = ERR_PTR(ret);
1619         brelse(iloc.bh);
1620         return link;
1621 }
1622
1623 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1624                                         struct ext4_dir_entry_2 **parent_de,
1625                                         int *retval)
1626 {
1627         struct ext4_iloc iloc;
1628
1629         *retval = ext4_get_inode_loc(inode, &iloc);
1630         if (*retval)
1631                 return NULL;
1632
1633         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1634
1635         return iloc.bh;
1636 }
1637
1638 /*
1639  * Try to create the inline data for the new dir.
1640  * If it succeeds, return 0, otherwise return the error.
1641  * In case of ENOSPC, the caller should create the normal disk layout dir.
1642  */
1643 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1644                                struct inode *inode)
1645 {
1646         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1647         struct ext4_iloc iloc;
1648         struct ext4_dir_entry_2 *de;
1649
1650         ret = ext4_get_inode_loc(inode, &iloc);
1651         if (ret)
1652                 return ret;
1653
1654         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1655         if (ret)
1656                 goto out;
1657
1658         /*
1659          * For inline dir, we only save the inode information for the ".."
1660          * and create a fake dentry to cover the left space.
1661          */
1662         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1663         de->inode = cpu_to_le32(parent->i_ino);
1664         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1665         de->inode = 0;
1666         de->rec_len = ext4_rec_len_to_disk(
1667                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1668                                 inline_size);
1669         set_nlink(inode, 2);
1670         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1671 out:
1672         brelse(iloc.bh);
1673         return ret;
1674 }
1675
1676 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1677                                         struct ext4_filename *fname,
1678                                         struct ext4_dir_entry_2 **res_dir,
1679                                         int *has_inline_data)
1680 {
1681         int ret;
1682         struct ext4_iloc iloc;
1683         void *inline_start;
1684         int inline_size;
1685
1686         if (ext4_get_inode_loc(dir, &iloc))
1687                 return NULL;
1688
1689         down_read(&EXT4_I(dir)->xattr_sem);
1690         if (!ext4_has_inline_data(dir)) {
1691                 *has_inline_data = 0;
1692                 goto out;
1693         }
1694
1695         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1696                                                 EXT4_INLINE_DOTDOT_SIZE;
1697         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1698         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1699                               dir, fname, 0, res_dir);
1700         if (ret == 1)
1701                 goto out_find;
1702         if (ret < 0)
1703                 goto out;
1704
1705         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1706                 goto out;
1707
1708         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1709         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1710
1711         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1712                               dir, fname, 0, res_dir);
1713         if (ret == 1)
1714                 goto out_find;
1715
1716 out:
1717         brelse(iloc.bh);
1718         iloc.bh = NULL;
1719 out_find:
1720         up_read(&EXT4_I(dir)->xattr_sem);
1721         return iloc.bh;
1722 }
1723
1724 int ext4_delete_inline_entry(handle_t *handle,
1725                              struct inode *dir,
1726                              struct ext4_dir_entry_2 *de_del,
1727                              struct buffer_head *bh,
1728                              int *has_inline_data)
1729 {
1730         int err, inline_size, no_expand;
1731         struct ext4_iloc iloc;
1732         void *inline_start;
1733
1734         err = ext4_get_inode_loc(dir, &iloc);
1735         if (err)
1736                 return err;
1737
1738         ext4_write_lock_xattr(dir, &no_expand);
1739         if (!ext4_has_inline_data(dir)) {
1740                 *has_inline_data = 0;
1741                 goto out;
1742         }
1743
1744         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1745                 EXT4_MIN_INLINE_DATA_SIZE) {
1746                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1747                                         EXT4_INLINE_DOTDOT_SIZE;
1748                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1749                                 EXT4_INLINE_DOTDOT_SIZE;
1750         } else {
1751                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1752                 inline_size = ext4_get_inline_size(dir) -
1753                                 EXT4_MIN_INLINE_DATA_SIZE;
1754         }
1755
1756         BUFFER_TRACE(bh, "get_write_access");
1757         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1758                                             EXT4_JTR_NONE);
1759         if (err)
1760                 goto out;
1761
1762         err = ext4_generic_delete_entry(dir, de_del, bh,
1763                                         inline_start, inline_size, 0);
1764         if (err)
1765                 goto out;
1766
1767         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1768 out:
1769         ext4_write_unlock_xattr(dir, &no_expand);
1770         if (likely(err == 0))
1771                 err = ext4_mark_inode_dirty(handle, dir);
1772         brelse(iloc.bh);
1773         if (err != -ENOENT)
1774                 ext4_std_error(dir->i_sb, err);
1775         return err;
1776 }
1777
1778 /*
1779  * Get the inline dentry at offset.
1780  */
1781 static inline struct ext4_dir_entry_2 *
1782 ext4_get_inline_entry(struct inode *inode,
1783                       struct ext4_iloc *iloc,
1784                       unsigned int offset,
1785                       void **inline_start,
1786                       int *inline_size)
1787 {
1788         void *inline_pos;
1789
1790         BUG_ON(offset > ext4_get_inline_size(inode));
1791
1792         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1793                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1794                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1795         } else {
1796                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1797                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1798                 *inline_size = ext4_get_inline_size(inode) -
1799                                 EXT4_MIN_INLINE_DATA_SIZE;
1800         }
1801
1802         if (inline_start)
1803                 *inline_start = inline_pos;
1804         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1805 }
1806
1807 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1808 {
1809         int err, inline_size;
1810         struct ext4_iloc iloc;
1811         size_t inline_len;
1812         void *inline_pos;
1813         unsigned int offset;
1814         struct ext4_dir_entry_2 *de;
1815         bool ret = false;
1816
1817         err = ext4_get_inode_loc(dir, &iloc);
1818         if (err) {
1819                 EXT4_ERROR_INODE_ERR(dir, -err,
1820                                      "error %d getting inode %lu block",
1821                                      err, dir->i_ino);
1822                 return false;
1823         }
1824
1825         down_read(&EXT4_I(dir)->xattr_sem);
1826         if (!ext4_has_inline_data(dir)) {
1827                 *has_inline_data = 0;
1828                 ret = true;
1829                 goto out;
1830         }
1831
1832         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1833         if (!le32_to_cpu(de->inode)) {
1834                 ext4_warning(dir->i_sb,
1835                              "bad inline directory (dir #%lu) - no `..'",
1836                              dir->i_ino);
1837                 goto out;
1838         }
1839
1840         inline_len = ext4_get_inline_size(dir);
1841         offset = EXT4_INLINE_DOTDOT_SIZE;
1842         while (offset < inline_len) {
1843                 de = ext4_get_inline_entry(dir, &iloc, offset,
1844                                            &inline_pos, &inline_size);
1845                 if (ext4_check_dir_entry(dir, NULL, de,
1846                                          iloc.bh, inline_pos,
1847                                          inline_size, offset)) {
1848                         ext4_warning(dir->i_sb,
1849                                      "bad inline directory (dir #%lu) - "
1850                                      "inode %u, rec_len %u, name_len %d"
1851                                      "inline size %d",
1852                                      dir->i_ino, le32_to_cpu(de->inode),
1853                                      le16_to_cpu(de->rec_len), de->name_len,
1854                                      inline_size);
1855                         goto out;
1856                 }
1857                 if (le32_to_cpu(de->inode)) {
1858                         goto out;
1859                 }
1860                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1861         }
1862
1863         ret = true;
1864 out:
1865         up_read(&EXT4_I(dir)->xattr_sem);
1866         brelse(iloc.bh);
1867         return ret;
1868 }
1869
1870 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1871 {
1872         int ret, no_expand;
1873
1874         ext4_write_lock_xattr(inode, &no_expand);
1875         ret = ext4_destroy_inline_data_nolock(handle, inode);
1876         ext4_write_unlock_xattr(inode, &no_expand);
1877
1878         return ret;
1879 }
1880
1881 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1882 {
1883         __u64 addr;
1884         int error = -EAGAIN;
1885         struct ext4_iloc iloc;
1886
1887         down_read(&EXT4_I(inode)->xattr_sem);
1888         if (!ext4_has_inline_data(inode))
1889                 goto out;
1890
1891         error = ext4_get_inode_loc(inode, &iloc);
1892         if (error)
1893                 goto out;
1894
1895         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1896         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1897         addr += offsetof(struct ext4_inode, i_block);
1898
1899         brelse(iloc.bh);
1900
1901         iomap->addr = addr;
1902         iomap->offset = 0;
1903         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1904                               i_size_read(inode));
1905         iomap->type = IOMAP_INLINE;
1906         iomap->flags = 0;
1907
1908 out:
1909         up_read(&EXT4_I(inode)->xattr_sem);
1910         return error;
1911 }
1912
1913 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1914 {
1915         handle_t *handle;
1916         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1917         size_t i_size;
1918         void *value = NULL;
1919         struct ext4_xattr_ibody_find is = {
1920                 .s = { .not_found = -ENODATA, },
1921         };
1922         struct ext4_xattr_info i = {
1923                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1924                 .name = EXT4_XATTR_SYSTEM_DATA,
1925         };
1926
1927
1928         needed_blocks = ext4_writepage_trans_blocks(inode);
1929         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1930         if (IS_ERR(handle))
1931                 return PTR_ERR(handle);
1932
1933         ext4_write_lock_xattr(inode, &no_expand);
1934         if (!ext4_has_inline_data(inode)) {
1935                 ext4_write_unlock_xattr(inode, &no_expand);
1936                 *has_inline = 0;
1937                 ext4_journal_stop(handle);
1938                 return 0;
1939         }
1940
1941         if ((err = ext4_orphan_add(handle, inode)) != 0)
1942                 goto out;
1943
1944         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1945                 goto out;
1946
1947         down_write(&EXT4_I(inode)->i_data_sem);
1948         i_size = inode->i_size;
1949         inline_size = ext4_get_inline_size(inode);
1950         EXT4_I(inode)->i_disksize = i_size;
1951
1952         if (i_size < inline_size) {
1953                 /*
1954                  * if there's inline data to truncate and this file was
1955                  * converted to extents after that inline data was written,
1956                  * the extent status cache must be cleared to avoid leaving
1957                  * behind stale delayed allocated extent entries
1958                  */
1959                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1960 retry:
1961                         err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1962                         if (err == -ENOMEM) {
1963                                 memalloc_retry_wait(GFP_ATOMIC);
1964                                 goto retry;
1965                         }
1966                         if (err)
1967                                 goto out_error;
1968                 }
1969
1970                 /* Clear the content in the xattr space. */
1971                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1972                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1973                                 goto out_error;
1974
1975                         BUG_ON(is.s.not_found);
1976
1977                         value_len = le32_to_cpu(is.s.here->e_value_size);
1978                         value = kmalloc(value_len, GFP_NOFS);
1979                         if (!value) {
1980                                 err = -ENOMEM;
1981                                 goto out_error;
1982                         }
1983
1984                         err = ext4_xattr_ibody_get(inode, i.name_index,
1985                                                    i.name, value, value_len);
1986                         if (err <= 0)
1987                                 goto out_error;
1988
1989                         i.value = value;
1990                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1991                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1992                         err = ext4_xattr_ibody_set(handle, inode, &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         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2038                 /*
2039                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2040                  * cleared. This means we are in the middle of moving of
2041                  * inline data to delay allocated block. Just force writeout
2042                  * here to finish conversion.
2043                  */
2044                 error = filemap_flush(inode->i_mapping);
2045                 if (error)
2046                         return error;
2047                 if (!ext4_has_inline_data(inode))
2048                         return 0;
2049         }
2050
2051         needed_blocks = ext4_writepage_trans_blocks(inode);
2052
2053         iloc.bh = NULL;
2054         error = ext4_get_inode_loc(inode, &iloc);
2055         if (error)
2056                 return error;
2057
2058         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2059         if (IS_ERR(handle)) {
2060                 error = PTR_ERR(handle);
2061                 goto out_free;
2062         }
2063
2064         ext4_write_lock_xattr(inode, &no_expand);
2065         if (ext4_has_inline_data(inode))
2066                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2067         ext4_write_unlock_xattr(inode, &no_expand);
2068         ext4_journal_stop(handle);
2069 out_free:
2070         brelse(iloc.bh);
2071         return error;
2072 }