fs/ext4/inline.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (c) 2012 Taobao.
   4  * Written by Tao Ma <boyu.mt@taobao.com>
   5  */
   6
   7 #include <linux/iomap.h>
   8 #include <linux/fiemap.h>
   9 #include <linux/iversion.h>
  10
  11 #include "ext4_jbd2.h"
  12 #include "ext4.h"
  13 #include "xattr.h"
  14 #include "truncate.h"
  15
  16 #define EXT4_XATTR_SYSTEM_DATA  "data"
  17 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  18 #define EXT4_INLINE_DOTDOT_OFFSET       2
  19 #define EXT4_INLINE_DOTDOT_SIZE         4
  20
  21 static int ext4_get_inline_size(struct inode *inode)
  22 {
  23         if (EXT4_I(inode)->i_inline_off)
  24                 return EXT4_I(inode)->i_inline_size;
  25
  26         return 0;
  27 }
  28
  29 static int get_max_inline_xattr_value_size(struct inode *inode,
  30                                            struct ext4_iloc *iloc)
  31 {
  32         struct ext4_xattr_ibody_header *header;
  33         struct ext4_xattr_entry *entry;
  34         struct ext4_inode *raw_inode;
  35         void *end;
  36         int free, min_offs;
  37
  38         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  39                 return 0;
  40
  41         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  42                         EXT4_GOOD_OLD_INODE_SIZE -
  43                         EXT4_I(inode)->i_extra_isize -
  44                         sizeof(struct ext4_xattr_ibody_header);
  45
  46         /*
  47          * We need to subtract another sizeof(__u32) since an in-inode xattr
  48          * needs an empty 4 bytes to indicate the gap between the xattr entry
  49          * and the name/value pair.
  50          */
  51         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  52                 return EXT4_XATTR_SIZE(min_offs -
  53                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  54                         EXT4_XATTR_ROUND - sizeof(__u32));
  55
  56         raw_inode = ext4_raw_inode(iloc);
  57         header = IHDR(inode, raw_inode);
  58         entry = IFIRST(header);
  59         end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  60
  61         /* Compute min_offs. */
  62         while (!IS_LAST_ENTRY(entry)) {
  63                 void *next = EXT4_XATTR_NEXT(entry);
  64
  65                 if (next >= end) {
  66                         EXT4_ERROR_INODE(inode,
  67                                          "corrupt xattr in inline inode");
  68                         return 0;
  69                 }
  70                 if (!entry->e_value_inum && entry->e_value_size) {
  71                         size_t offs = le16_to_cpu(entry->e_value_offs);
  72                         if (offs < min_offs)
  73                                 min_offs = offs;
  74                 }
  75                 entry = next;
  76         }
  77         free = min_offs -
  78                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  79
  80         if (EXT4_I(inode)->i_inline_off) {
  81                 entry = (struct ext4_xattr_entry *)
  82                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  83
  84                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  85                 goto out;
  86         }
  87
  88         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  89
  90         if (free > EXT4_XATTR_ROUND)
  91                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  92         else
  93                 free = 0;
  94
  95 out:
  96         return free;
  97 }
  98
  99 /*
 100  * Get the maximum size we now can store in an inode.
 101  * If we can't find the space for a xattr entry, don't use the space
 102  * of the extents since we have no space to indicate the inline data.
 103  */
 104 int ext4_get_max_inline_size(struct inode *inode)
 105 {
 106         int error, max_inline_size;
 107         struct ext4_iloc iloc;
 108
 109         if (EXT4_I(inode)->i_extra_isize == 0)
 110                 return 0;
 111
 112         error = ext4_get_inode_loc(inode, &iloc);
 113         if (error) {
 114                 ext4_error_inode(inode, __func__, __LINE__, 0,
 115                                  "can't get inode location %lu",
 116                                  inode->i_ino);
 117                 return 0;
 118         }
 119
 120         down_read(&EXT4_I(inode)->xattr_sem);
 121         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 122         up_read(&EXT4_I(inode)->xattr_sem);
 123
 124         brelse(iloc.bh);
 125
 126         if (!max_inline_size)
 127                 return 0;
 128
 129         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 130 }
 131
 132 /*
 133  * this function does not take xattr_sem, which is OK because it is
 134  * currently only used in a code path coming form ext4_iget, before
 135  * the new inode has been unlocked
 136  */
 137 int ext4_find_inline_data_nolock(struct inode *inode)
 138 {
 139         struct ext4_xattr_ibody_find is = {
 140                 .s = { .not_found = -ENODATA, },
 141         };
 142         struct ext4_xattr_info i = {
 143                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 144                 .name = EXT4_XATTR_SYSTEM_DATA,
 145         };
 146         int error;
 147
 148         if (EXT4_I(inode)->i_extra_isize == 0)
 149                 return 0;
 150
 151         error = ext4_get_inode_loc(inode, &is.iloc);
 152         if (error)
 153                 return error;
 154
 155         error = ext4_xattr_ibody_find(inode, &i, &is);
 156         if (error)
 157                 goto out;
 158
 159         if (!is.s.not_found) {
 160                 if (is.s.here->e_value_inum) {
 161                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 162                                          "to an external xattr inode");
 163                         error = -EFSCORRUPTED;
 164                         goto out;
 165                 }
 166                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 167                                         (void *)ext4_raw_inode(&is.iloc));
 168                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 169                                 le32_to_cpu(is.s.here->e_value_size);
 170         }
 171 out:
 172         brelse(is.iloc.bh);
 173         return error;
 174 }
 175
 176 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 177                                  unsigned int len,
 178                                  struct ext4_iloc *iloc)
 179 {
 180         struct ext4_xattr_entry *entry;
 181         struct ext4_xattr_ibody_header *header;
 182         int cp_len = 0;
 183         struct ext4_inode *raw_inode;
 184
 185         if (!len)
 186                 return 0;
 187
 188         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 189
 190         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 191                         len : EXT4_MIN_INLINE_DATA_SIZE;
 192
 193         raw_inode = ext4_raw_inode(iloc);
 194         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 195
 196         len -= cp_len;
 197         buffer += cp_len;
 198
 199         if (!len)
 200                 goto out;
 201
 202         header = IHDR(inode, raw_inode);
 203         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 204                                             EXT4_I(inode)->i_inline_off);
 205         len = min_t(unsigned int, len,
 206                     (unsigned int)le32_to_cpu(entry->e_value_size));
 207
 208         memcpy(buffer,
 209                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 210         cp_len += len;
 211
 212 out:
 213         return cp_len;
 214 }
 215
 216 /*
 217  * write the buffer to the inline inode.
 218  * If 'create' is set, we don't need to do the extra copy in the xattr
 219  * value since it is already handled by ext4_xattr_ibody_set.
 220  * That saves us one memcpy.
 221  */
 222 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 223                                    void *buffer, loff_t pos, unsigned int len)
 224 {
 225         struct ext4_xattr_entry *entry;
 226         struct ext4_xattr_ibody_header *header;
 227         struct ext4_inode *raw_inode;
 228         int cp_len = 0;
 229
 230         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 231                 return;
 232
 233         BUG_ON(!EXT4_I(inode)->i_inline_off);
 234         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 235
 236         raw_inode = ext4_raw_inode(iloc);
 237         buffer += pos;
 238
 239         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 240                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 241                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 242                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 243
 244                 len -= cp_len;
 245                 buffer += cp_len;
 246                 pos += cp_len;
 247         }
 248
 249         if (!len)
 250                 return;
 251
 252         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 253         header = IHDR(inode, raw_inode);
 254         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 255                                             EXT4_I(inode)->i_inline_off);
 256
 257         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 258                buffer, len);
 259 }
 260
 261 static int ext4_create_inline_data(handle_t *handle,
 262                                    struct inode *inode, unsigned len)
 263 {
 264         int error;
 265         void *value = NULL;
 266         struct ext4_xattr_ibody_find is = {
 267                 .s = { .not_found = -ENODATA, },
 268         };
 269         struct ext4_xattr_info i = {
 270                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 271                 .name = EXT4_XATTR_SYSTEM_DATA,
 272         };
 273
 274         error = ext4_get_inode_loc(inode, &is.iloc);
 275         if (error)
 276                 return error;
 277
 278         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 279         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 280         if (error)
 281                 goto out;
 282
 283         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 284                 value = EXT4_ZERO_XATTR_VALUE;
 285                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 286         } else {
 287                 value = "";
 288                 len = 0;
 289         }
 290
 291         /* Insert the the xttr entry. */
 292         i.value = value;
 293         i.value_len = len;
 294
 295         error = ext4_xattr_ibody_find(inode, &i, &is);
 296         if (error)
 297                 goto out;
 298
 299         BUG_ON(!is.s.not_found);
 300
 301         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 302         if (error) {
 303                 if (error == -ENOSPC)
 304                         ext4_clear_inode_state(inode,
 305                                                EXT4_STATE_MAY_INLINE_DATA);
 306                 goto out;
 307         }
 308
 309         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 310                 0, EXT4_MIN_INLINE_DATA_SIZE);
 311
 312         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 313                                       (void *)ext4_raw_inode(&is.iloc));
 314         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 315         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 316         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 317         get_bh(is.iloc.bh);
 318         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 319
 320 out:
 321         brelse(is.iloc.bh);
 322         return error;
 323 }
 324
 325 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 326                                    unsigned int len)
 327 {
 328         int error;
 329         void *value = NULL;
 330         struct ext4_xattr_ibody_find is = {
 331                 .s = { .not_found = -ENODATA, },
 332         };
 333         struct ext4_xattr_info i = {
 334                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 335                 .name = EXT4_XATTR_SYSTEM_DATA,
 336         };
 337
 338         /* If the old space is ok, write the data directly. */
 339         if (len <= EXT4_I(inode)->i_inline_size)
 340                 return 0;
 341
 342         error = ext4_get_inode_loc(inode, &is.iloc);
 343         if (error)
 344                 return error;
 345
 346         error = ext4_xattr_ibody_find(inode, &i, &is);
 347         if (error)
 348                 goto out;
 349
 350         BUG_ON(is.s.not_found);
 351
 352         len -= EXT4_MIN_INLINE_DATA_SIZE;
 353         value = kzalloc(len, GFP_NOFS);
 354         if (!value) {
 355                 error = -ENOMEM;
 356                 goto out;
 357         }
 358
 359         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 360                                      value, len);
 361         if (error < 0)
 362                 goto out;
 363
 364         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 365         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 366         if (error)
 367                 goto out;
 368
 369         /* Update the xttr entry. */
 370         i.value = value;
 371         i.value_len = len;
 372
 373         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 374         if (error)
 375                 goto out;
 376
 377         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 378                                       (void *)ext4_raw_inode(&is.iloc));
 379         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 380                                 le32_to_cpu(is.s.here->e_value_size);
 381         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 382         get_bh(is.iloc.bh);
 383         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 384
 385 out:
 386         kfree(value);
 387         brelse(is.iloc.bh);
 388         return error;
 389 }
 390
 391 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 392                                     unsigned int len)
 393 {
 394         int ret, size, no_expand;
 395         struct ext4_inode_info *ei = EXT4_I(inode);
 396
 397         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 398                 return -ENOSPC;
 399
 400         size = ext4_get_max_inline_size(inode);
 401         if (size < len)
 402                 return -ENOSPC;
 403
 404         ext4_write_lock_xattr(inode, &no_expand);
 405
 406         if (ei->i_inline_off)
 407                 ret = ext4_update_inline_data(handle, inode, len);
 408         else
 409                 ret = ext4_create_inline_data(handle, inode, len);
 410
 411         ext4_write_unlock_xattr(inode, &no_expand);
 412         return ret;
 413 }
 414
 415 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 416                                            struct inode *inode)
 417 {
 418         struct ext4_inode_info *ei = EXT4_I(inode);
 419         struct ext4_xattr_ibody_find is = {
 420                 .s = { .not_found = 0, },
 421         };
 422         struct ext4_xattr_info i = {
 423                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 424                 .name = EXT4_XATTR_SYSTEM_DATA,
 425                 .value = NULL,
 426                 .value_len = 0,
 427         };
 428         int error;
 429
 430         if (!ei->i_inline_off)
 431                 return 0;
 432
 433         error = ext4_get_inode_loc(inode, &is.iloc);
 434         if (error)
 435                 return error;
 436
 437         error = ext4_xattr_ibody_find(inode, &i, &is);
 438         if (error)
 439                 goto out;
 440
 441         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 442         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 443         if (error)
 444                 goto out;
 445
 446         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 447         if (error)
 448                 goto out;
 449
 450         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 451                 0, EXT4_MIN_INLINE_DATA_SIZE);
 452         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 453
 454         if (ext4_has_feature_extents(inode->i_sb)) {
 455                 if (S_ISDIR(inode->i_mode) ||
 456                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 457                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 458                         ext4_ext_tree_init(handle, inode);
 459                 }
 460         }
 461         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 462
 463         get_bh(is.iloc.bh);
 464         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 465
 466         EXT4_I(inode)->i_inline_off = 0;
 467         EXT4_I(inode)->i_inline_size = 0;
 468         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 469 out:
 470         brelse(is.iloc.bh);
 471         if (error == -ENODATA)
 472                 error = 0;
 473         return error;
 474 }
 475
 476 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 477 {
 478         void *kaddr;
 479         int ret = 0;
 480         size_t len;
 481         struct ext4_iloc iloc;
 482
 483         BUG_ON(!PageLocked(page));
 484         BUG_ON(!ext4_has_inline_data(inode));
 485         BUG_ON(page->index);
 486
 487         if (!EXT4_I(inode)->i_inline_off) {
 488                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 489                              inode->i_ino);
 490                 goto out;
 491         }
 492
 493         ret = ext4_get_inode_loc(inode, &iloc);
 494         if (ret)
 495                 goto out;
 496
 497         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 498         kaddr = kmap_atomic(page);
 499         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 500         flush_dcache_page(page);
 501         kunmap_atomic(kaddr);
 502         zero_user_segment(page, len, PAGE_SIZE);
 503         SetPageUptodate(page);
 504         brelse(iloc.bh);
 505
 506 out:
 507         return ret;
 508 }
 509
 510 int ext4_readpage_inline(struct inode *inode, struct page *page)
 511 {
 512         int ret = 0;
 513
 514         down_read(&EXT4_I(inode)->xattr_sem);
 515         if (!ext4_has_inline_data(inode)) {
 516                 up_read(&EXT4_I(inode)->xattr_sem);
 517                 return -EAGAIN;
 518         }
 519
 520         /*
 521          * Current inline data can only exist in the 1st page,
 522          * So for all the other pages, just set them uptodate.
 523          */
 524         if (!page->index)
 525                 ret = ext4_read_inline_page(inode, page);
 526         else if (!PageUptodate(page)) {
 527                 zero_user_segment(page, 0, PAGE_SIZE);
 528                 SetPageUptodate(page);
 529         }
 530
 531         up_read(&EXT4_I(inode)->xattr_sem);
 532
 533         unlock_page(page);
 534         return ret >= 0 ? 0 : ret;
 535 }
 536
 537 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 538                                               struct inode *inode,
 539                                               unsigned flags)
 540 {
 541         int ret, needed_blocks, no_expand;
 542         handle_t *handle = NULL;
 543         int retries = 0, sem_held = 0;
 544         struct page *page = NULL;
 545         unsigned from, to;
 546         struct ext4_iloc iloc;
 547
 548         if (!ext4_has_inline_data(inode)) {
 549                 /*
 550                  * clear the flag so that no new write
 551                  * will trap here again.
 552                  */
 553                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 554                 return 0;
 555         }
 556
 557         needed_blocks = ext4_writepage_trans_blocks(inode);
 558
 559         ret = ext4_get_inode_loc(inode, &iloc);
 560         if (ret)
 561                 return ret;
 562
 563 retry:
 564         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 565         if (IS_ERR(handle)) {
 566                 ret = PTR_ERR(handle);
 567                 handle = NULL;
 568                 goto out;
 569         }
 570
 571         /* We cannot recurse into the filesystem as the transaction is already
 572          * started */
 573         flags |= AOP_FLAG_NOFS;
 574
 575         page = grab_cache_page_write_begin(mapping, 0, flags);
 576         if (!page) {
 577                 ret = -ENOMEM;
 578                 goto out;
 579         }
 580
 581         ext4_write_lock_xattr(inode, &no_expand);
 582         sem_held = 1;
 583         /* If some one has already done this for us, just exit. */
 584         if (!ext4_has_inline_data(inode)) {
 585                 ret = 0;
 586                 goto out;
 587         }
 588
 589         from = 0;
 590         to = ext4_get_inline_size(inode);
 591         if (!PageUptodate(page)) {
 592                 ret = ext4_read_inline_page(inode, page);
 593                 if (ret < 0)
 594                         goto out;
 595         }
 596
 597         ret = ext4_destroy_inline_data_nolock(handle, inode);
 598         if (ret)
 599                 goto out;
 600
 601         if (ext4_should_dioread_nolock(inode)) {
 602                 ret = __block_write_begin(page, from, to,
 603                                           ext4_get_block_unwritten);
 604         } else
 605                 ret = __block_write_begin(page, from, to, ext4_get_block);
 606
 607         if (!ret && ext4_should_journal_data(inode)) {
 608                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 609                                              from, to, NULL,
 610                                              do_journal_get_write_access);
 611         }
 612
 613         if (ret) {
 614                 unlock_page(page);
 615                 put_page(page);
 616                 page = NULL;
 617                 ext4_orphan_add(handle, inode);
 618                 ext4_write_unlock_xattr(inode, &no_expand);
 619                 sem_held = 0;
 620                 ext4_journal_stop(handle);
 621                 handle = NULL;
 622                 ext4_truncate_failed_write(inode);
 623                 /*
 624                  * If truncate failed early the inode might
 625                  * still be on the orphan list; we need to
 626                  * make sure the inode is removed from the
 627                  * orphan list in that case.
 628                  */
 629                 if (inode->i_nlink)
 630                         ext4_orphan_del(NULL, inode);
 631         }
 632
 633         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 634                 goto retry;
 635
 636         if (page)
 637                 block_commit_write(page, from, to);
 638 out:
 639         if (page) {
 640                 unlock_page(page);
 641                 put_page(page);
 642         }
 643         if (sem_held)
 644                 ext4_write_unlock_xattr(inode, &no_expand);
 645         if (handle)
 646                 ext4_journal_stop(handle);
 647         brelse(iloc.bh);
 648         return ret;
 649 }
 650
 651 /*
 652  * Try to write data in the inode.
 653  * If the inode has inline data, check whether the new write can be
 654  * in the inode also. If not, create the page the handle, move the data
 655  * to the page make it update and let the later codes create extent for it.
 656  */
 657 int ext4_try_to_write_inline_data(struct address_space *mapping,
 658                                   struct inode *inode,
 659                                   loff_t pos, unsigned len,
 660                                   unsigned flags,
 661                                   struct page **pagep)
 662 {
 663         int ret;
 664         handle_t *handle;
 665         struct page *page;
 666         struct ext4_iloc iloc;
 667
 668         if (pos + len > ext4_get_max_inline_size(inode))
 669                 goto convert;
 670
 671         ret = ext4_get_inode_loc(inode, &iloc);
 672         if (ret)
 673                 return ret;
 674
 675         /*
 676          * The possible write could happen in the inode,
 677          * so try to reserve the space in inode first.
 678          */
 679         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 680         if (IS_ERR(handle)) {
 681                 ret = PTR_ERR(handle);
 682                 handle = NULL;
 683                 goto out;
 684         }
 685
 686         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 687         if (ret && ret != -ENOSPC)
 688                 goto out;
 689
 690         /* We don't have space in inline inode, so convert it to extent. */
 691         if (ret == -ENOSPC) {
 692                 ext4_journal_stop(handle);
 693                 brelse(iloc.bh);
 694                 goto convert;
 695         }
 696
 697         ret = ext4_journal_get_write_access(handle, iloc.bh);
 698         if (ret)
 699                 goto out;
 700
 701         flags |= AOP_FLAG_NOFS;
 702
 703         page = grab_cache_page_write_begin(mapping, 0, flags);
 704         if (!page) {
 705                 ret = -ENOMEM;
 706                 goto out;
 707         }
 708
 709         *pagep = page;
 710         down_read(&EXT4_I(inode)->xattr_sem);
 711         if (!ext4_has_inline_data(inode)) {
 712                 ret = 0;
 713                 unlock_page(page);
 714                 put_page(page);
 715                 goto out_up_read;
 716         }
 717
 718         if (!PageUptodate(page)) {
 719                 ret = ext4_read_inline_page(inode, page);
 720                 if (ret < 0) {
 721                         unlock_page(page);
 722                         put_page(page);
 723                         goto out_up_read;
 724                 }
 725         }
 726
 727         ret = 1;
 728         handle = NULL;
 729 out_up_read:
 730         up_read(&EXT4_I(inode)->xattr_sem);
 731 out:
 732         if (handle && (ret != 1))
 733                 ext4_journal_stop(handle);
 734         brelse(iloc.bh);
 735         return ret;
 736 convert:
 737         return ext4_convert_inline_data_to_extent(mapping,
 738                                                   inode, flags);
 739 }
 740
 741 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 742                                unsigned copied, struct page *page)
 743 {
 744         int ret, no_expand;
 745         void *kaddr;
 746         struct ext4_iloc iloc;
 747
 748         if (unlikely(copied < len)) {
 749                 if (!PageUptodate(page)) {
 750                         copied = 0;
 751                         goto out;
 752                 }
 753         }
 754
 755         ret = ext4_get_inode_loc(inode, &iloc);
 756         if (ret) {
 757                 ext4_std_error(inode->i_sb, ret);
 758                 copied = 0;
 759                 goto out;
 760         }
 761
 762         ext4_write_lock_xattr(inode, &no_expand);
 763         BUG_ON(!ext4_has_inline_data(inode));
 764
 765         /*
 766          * ei->i_inline_off may have changed since ext4_write_begin()
 767          * called ext4_try_to_write_inline_data()
 768          */
 769         (void) ext4_find_inline_data_nolock(inode);
 770
 771         kaddr = kmap_atomic(page);
 772         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 773         kunmap_atomic(kaddr);
 774         SetPageUptodate(page);
 775         /* clear page dirty so that writepages wouldn't work for us. */
 776         ClearPageDirty(page);
 777
 778         ext4_write_unlock_xattr(inode, &no_expand);
 779         brelse(iloc.bh);
 780         mark_inode_dirty(inode);
 781 out:
 782         return copied;
 783 }
 784
 785 struct buffer_head *
 786 ext4_journalled_write_inline_data(struct inode *inode,
 787                                   unsigned len,
 788                                   struct page *page)
 789 {
 790         int ret, no_expand;
 791         void *kaddr;
 792         struct ext4_iloc iloc;
 793
 794         ret = ext4_get_inode_loc(inode, &iloc);
 795         if (ret) {
 796                 ext4_std_error(inode->i_sb, ret);
 797                 return NULL;
 798         }
 799
 800         ext4_write_lock_xattr(inode, &no_expand);
 801         kaddr = kmap_atomic(page);
 802         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 803         kunmap_atomic(kaddr);
 804         ext4_write_unlock_xattr(inode, &no_expand);
 805
 806         return iloc.bh;
 807 }
 808
 809 /*
 810  * Try to make the page cache and handle ready for the inline data case.
 811  * We can call this function in 2 cases:
 812  * 1. The inode is created and the first write exceeds inline size. We can
 813  *    clear the inode state safely.
 814  * 2. The inode has inline data, then we need to read the data, make it
 815  *    update and dirty so that ext4_da_writepages can handle it. We don't
 816  *    need to start the journal since the file's metatdata isn't changed now.
 817  */
 818 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 819                                                  struct inode *inode,
 820                                                  unsigned flags,
 821                                                  void **fsdata)
 822 {
 823         int ret = 0, inline_size;
 824         struct page *page;
 825
 826         page = grab_cache_page_write_begin(mapping, 0, flags);
 827         if (!page)
 828                 return -ENOMEM;
 829
 830         down_read(&EXT4_I(inode)->xattr_sem);
 831         if (!ext4_has_inline_data(inode)) {
 832                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 833                 goto out;
 834         }
 835
 836         inline_size = ext4_get_inline_size(inode);
 837
 838         if (!PageUptodate(page)) {
 839                 ret = ext4_read_inline_page(inode, page);
 840                 if (ret < 0)
 841                         goto out;
 842         }
 843
 844         ret = __block_write_begin(page, 0, inline_size,
 845                                   ext4_da_get_block_prep);
 846         if (ret) {
 847                 up_read(&EXT4_I(inode)->xattr_sem);
 848                 unlock_page(page);
 849                 put_page(page);
 850                 ext4_truncate_failed_write(inode);
 851                 return ret;
 852         }
 853
 854         SetPageDirty(page);
 855         SetPageUptodate(page);
 856         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 857         *fsdata = (void *)CONVERT_INLINE_DATA;
 858
 859 out:
 860         up_read(&EXT4_I(inode)->xattr_sem);
 861         if (page) {
 862                 unlock_page(page);
 863                 put_page(page);
 864         }
 865         return ret;
 866 }
 867
 868 /*
 869  * Prepare the write for the inline data.
 870  * If the the data can be written into the inode, we just read
 871  * the page and make it uptodate, and start the journal.
 872  * Otherwise read the page, makes it dirty so that it can be
 873  * handle in writepages(the i_disksize update is left to the
 874  * normal ext4_da_write_end).
 875  */
 876 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 877                                     struct inode *inode,
 878                                     loff_t pos, unsigned len,
 879                                     unsigned flags,
 880                                     struct page **pagep,
 881                                     void **fsdata)
 882 {
 883         int ret, inline_size;
 884         handle_t *handle;
 885         struct page *page;
 886         struct ext4_iloc iloc;
 887         int retries = 0;
 888
 889         ret = ext4_get_inode_loc(inode, &iloc);
 890         if (ret)
 891                 return ret;
 892
 893 retry_journal:
 894         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 895         if (IS_ERR(handle)) {
 896                 ret = PTR_ERR(handle);
 897                 goto out;
 898         }
 899
 900         inline_size = ext4_get_max_inline_size(inode);
 901
 902         ret = -ENOSPC;
 903         if (inline_size >= pos + len) {
 904                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 905                 if (ret && ret != -ENOSPC)
 906                         goto out_journal;
 907         }
 908
 909         /*
 910          * We cannot recurse into the filesystem as the transaction
 911          * is already started.
 912          */
 913         flags |= AOP_FLAG_NOFS;
 914
 915         if (ret == -ENOSPC) {
 916                 ext4_journal_stop(handle);
 917                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 918                                                             inode,
 919                                                             flags,
 920                                                             fsdata);
 921                 if (ret == -ENOSPC &&
 922                     ext4_should_retry_alloc(inode->i_sb, &retries))
 923                         goto retry_journal;
 924                 goto out;
 925         }
 926
 927         page = grab_cache_page_write_begin(mapping, 0, flags);
 928         if (!page) {
 929                 ret = -ENOMEM;
 930                 goto out_journal;
 931         }
 932
 933         down_read(&EXT4_I(inode)->xattr_sem);
 934         if (!ext4_has_inline_data(inode)) {
 935                 ret = 0;
 936                 goto out_release_page;
 937         }
 938
 939         if (!PageUptodate(page)) {
 940                 ret = ext4_read_inline_page(inode, page);
 941                 if (ret < 0)
 942                         goto out_release_page;
 943         }
 944         ret = ext4_journal_get_write_access(handle, iloc.bh);
 945         if (ret)
 946                 goto out_release_page;
 947
 948         up_read(&EXT4_I(inode)->xattr_sem);
 949         *pagep = page;
 950         brelse(iloc.bh);
 951         return 1;
 952 out_release_page:
 953         up_read(&EXT4_I(inode)->xattr_sem);
 954         unlock_page(page);
 955         put_page(page);
 956 out_journal:
 957         ext4_journal_stop(handle);
 958 out:
 959         brelse(iloc.bh);
 960         return ret;
 961 }
 962
 963 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 964                                   unsigned len, unsigned copied,
 965                                   struct page *page)
 966 {
 967         int ret;
 968
 969         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 970         if (ret < 0) {
 971                 unlock_page(page);
 972                 put_page(page);
 973                 return ret;
 974         }
 975         copied = ret;
 976
 977         /*
 978          * No need to use i_size_read() here, the i_size
 979          * cannot change under us because we hold i_mutex.
 980          *
 981          * But it's important to update i_size while still holding page lock:
 982          * page writeout could otherwise come in and zero beyond i_size.
 983          */
 984         if (pos+copied > inode->i_size)
 985                 i_size_write(inode, pos+copied);
 986         unlock_page(page);
 987         put_page(page);
 988
 989         /*
 990          * Don't mark the inode dirty under page lock. First, it unnecessarily
 991          * makes the holding time of page lock longer. Second, it forces lock
 992          * ordering of page lock and transaction start for journaling
 993          * filesystems.
 994          */
 995         mark_inode_dirty(inode);
 996
 997         return copied;
 998 }
 999
1000 #ifdef INLINE_DIR_DEBUG
1001 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
1002                           void *inline_start, int inline_size)
1003 {
1004         int offset;
1005         unsigned short de_len;
1006         struct ext4_dir_entry_2 *de = inline_start;
1007         void *dlimit = inline_start + inline_size;
1008
1009         trace_printk("inode %lu\n", dir->i_ino);
1010         offset = 0;
1011         while ((void *)de < dlimit) {
1012                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1013                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1014                              offset, de_len, de->name_len, de->name,
1015                              de->name_len, le32_to_cpu(de->inode));
1016                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1017                                          inline_start, inline_size, offset))
1018                         BUG();
1019
1020                 offset += de_len;
1021                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1022         }
1023 }
1024 #else
1025 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1026 #endif
1027
1028 /*
1029  * Add a new entry into a inline dir.
1030  * It will return -ENOSPC if no space is available, and -EIO
1031  * and -EEXIST if directory entry already exists.
1032  */
1033 static int ext4_add_dirent_to_inline(handle_t *handle,
1034                                      struct ext4_filename *fname,
1035                                      struct inode *dir,
1036                                      struct inode *inode,
1037                                      struct ext4_iloc *iloc,
1038                                      void *inline_start, int inline_size)
1039 {
1040         int             err;
1041         struct ext4_dir_entry_2 *de;
1042
1043         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1044                                 inline_size, fname, &de);
1045         if (err)
1046                 return err;
1047
1048         BUFFER_TRACE(iloc->bh, "get_write_access");
1049         err = ext4_journal_get_write_access(handle, iloc->bh);
1050         if (err)
1051                 return err;
1052         ext4_insert_dentry(inode, de, inline_size, fname);
1053
1054         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1055
1056         /*
1057          * XXX shouldn't update any times until successful
1058          * completion of syscall, but too many callers depend
1059          * on this.
1060          *
1061          * XXX similarly, too many callers depend on
1062          * ext4_new_inode() setting the times, but error
1063          * recovery deletes the inode, so the worst that can
1064          * happen is that the times are slightly out of date
1065          * and/or different from the directory change time.
1066          */
1067         dir->i_mtime = dir->i_ctime = current_time(dir);
1068         ext4_update_dx_flag(dir);
1069         inode_inc_iversion(dir);
1070         return 1;
1071 }
1072
1073 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1074                                        struct ext4_iloc *iloc)
1075 {
1076         struct ext4_xattr_entry *entry;
1077         struct ext4_xattr_ibody_header *header;
1078
1079         BUG_ON(!EXT4_I(inode)->i_inline_off);
1080
1081         header = IHDR(inode, ext4_raw_inode(iloc));
1082         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1083                                             EXT4_I(inode)->i_inline_off);
1084
1085         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1086 }
1087
1088 /* Set the final de to cover the whole block. */
1089 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1090 {
1091         struct ext4_dir_entry_2 *de, *prev_de;
1092         void *limit;
1093         int de_len;
1094
1095         de = (struct ext4_dir_entry_2 *)de_buf;
1096         if (old_size) {
1097                 limit = de_buf + old_size;
1098                 do {
1099                         prev_de = de;
1100                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1101                         de_buf += de_len;
1102                         de = (struct ext4_dir_entry_2 *)de_buf;
1103                 } while (de_buf < limit);
1104
1105                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1106                                                         old_size, new_size);
1107         } else {
1108                 /* this is just created, so create an empty entry. */
1109                 de->inode = 0;
1110                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1111         }
1112 }
1113
1114 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1115                                   struct ext4_iloc *iloc)
1116 {
1117         int ret;
1118         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1119         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1120
1121         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1122                 return -ENOSPC;
1123
1124         ret = ext4_update_inline_data(handle, dir,
1125                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1126         if (ret)
1127                 return ret;
1128
1129         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1130                              EXT4_I(dir)->i_inline_size -
1131                                                 EXT4_MIN_INLINE_DATA_SIZE);
1132         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1133         return 0;
1134 }
1135
1136 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1137                                      struct ext4_iloc *iloc,
1138                                      void *buf, int inline_size)
1139 {
1140         int ret;
1141
1142         ret = ext4_create_inline_data(handle, inode, inline_size);
1143         if (ret) {
1144                 ext4_msg(inode->i_sb, KERN_EMERG,
1145                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1146                         inode->i_ino, ret);
1147                 return;
1148         }
1149         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1150         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1151 }
1152
1153 static int ext4_finish_convert_inline_dir(handle_t *handle,
1154                                           struct inode *inode,
1155                                           struct buffer_head *dir_block,
1156                                           void *buf,
1157                                           int inline_size)
1158 {
1159         int err, csum_size = 0, header_size = 0;
1160         struct ext4_dir_entry_2 *de;
1161         struct ext4_dir_entry_tail *t;
1162         void *target = dir_block->b_data;
1163
1164         /*
1165          * First create "." and ".." and then copy the dir information
1166          * back to the block.
1167          */
1168         de = (struct ext4_dir_entry_2 *)target;
1169         de = ext4_init_dot_dotdot(inode, de,
1170                 inode->i_sb->s_blocksize, csum_size,
1171                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1172         header_size = (void *)de - target;
1173
1174         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1175                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1176
1177         if (ext4_has_metadata_csum(inode->i_sb))
1178                 csum_size = sizeof(struct ext4_dir_entry_tail);
1179
1180         inode->i_size = inode->i_sb->s_blocksize;
1181         i_size_write(inode, inode->i_sb->s_blocksize);
1182         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1183         ext4_update_final_de(dir_block->b_data,
1184                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1185                         inode->i_sb->s_blocksize - csum_size);
1186
1187         if (csum_size) {
1188                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1189                                      inode->i_sb->s_blocksize);
1190                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1191         }
1192         set_buffer_uptodate(dir_block);
1193         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1194         if (err)
1195                 return err;
1196         set_buffer_verified(dir_block);
1197         return ext4_mark_inode_dirty(handle, inode);
1198 }
1199
1200 static int ext4_convert_inline_data_nolock(handle_t *handle,
1201                                            struct inode *inode,
1202                                            struct ext4_iloc *iloc)
1203 {
1204         int error;
1205         void *buf = NULL;
1206         struct buffer_head *data_bh = NULL;
1207         struct ext4_map_blocks map;
1208         int inline_size;
1209
1210         inline_size = ext4_get_inline_size(inode);
1211         buf = kmalloc(inline_size, GFP_NOFS);
1212         if (!buf) {
1213                 error = -ENOMEM;
1214                 goto out;
1215         }
1216
1217         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1218         if (error < 0)
1219                 goto out;
1220
1221         /*
1222          * Make sure the inline directory entries pass checks before we try to
1223          * convert them, so that we avoid touching stuff that needs fsck.
1224          */
1225         if (S_ISDIR(inode->i_mode)) {
1226                 error = ext4_check_all_de(inode, iloc->bh,
1227                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1228                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1229                 if (error)
1230                         goto out;
1231         }
1232
1233         error = ext4_destroy_inline_data_nolock(handle, inode);
1234         if (error)
1235                 goto out;
1236
1237         map.m_lblk = 0;
1238         map.m_len = 1;
1239         map.m_flags = 0;
1240         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1241         if (error < 0)
1242                 goto out_restore;
1243         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1244                 error = -EIO;
1245                 goto out_restore;
1246         }
1247
1248         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1249         if (!data_bh) {
1250                 error = -ENOMEM;
1251                 goto out_restore;
1252         }
1253
1254         lock_buffer(data_bh);
1255         error = ext4_journal_get_create_access(handle, data_bh);
1256         if (error) {
1257                 unlock_buffer(data_bh);
1258                 error = -EIO;
1259                 goto out_restore;
1260         }
1261         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1262
1263         if (!S_ISDIR(inode->i_mode)) {
1264                 memcpy(data_bh->b_data, buf, inline_size);
1265                 set_buffer_uptodate(data_bh);
1266                 error = ext4_handle_dirty_metadata(handle,
1267                                                    inode, data_bh);
1268         } else {
1269                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1270                                                        buf, inline_size);
1271         }
1272
1273         unlock_buffer(data_bh);
1274 out_restore:
1275         if (error)
1276                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1277
1278 out:
1279         brelse(data_bh);
1280         kfree(buf);
1281         return error;
1282 }
1283
1284 /*
1285  * Try to add the new entry to the inline data.
1286  * If succeeds, return 0. If not, extended the inline dir and copied data to
1287  * the new created block.
1288  */
1289 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1290                               struct inode *dir, struct inode *inode)
1291 {
1292         int ret, inline_size, no_expand;
1293         void *inline_start;
1294         struct ext4_iloc iloc;
1295
1296         ret = ext4_get_inode_loc(dir, &iloc);
1297         if (ret)
1298                 return ret;
1299
1300         ext4_write_lock_xattr(dir, &no_expand);
1301         if (!ext4_has_inline_data(dir))
1302                 goto out;
1303
1304         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1305                                                  EXT4_INLINE_DOTDOT_SIZE;
1306         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1307
1308         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1309                                         inline_start, inline_size);
1310         if (ret != -ENOSPC)
1311                 goto out;
1312
1313         /* check whether it can be inserted to inline xattr space. */
1314         inline_size = EXT4_I(dir)->i_inline_size -
1315                         EXT4_MIN_INLINE_DATA_SIZE;
1316         if (!inline_size) {
1317                 /* Try to use the xattr space.*/
1318                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1319                 if (ret && ret != -ENOSPC)
1320                         goto out;
1321
1322                 inline_size = EXT4_I(dir)->i_inline_size -
1323                                 EXT4_MIN_INLINE_DATA_SIZE;
1324         }
1325
1326         if (inline_size) {
1327                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1328
1329                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1330                                                 inode, &iloc, inline_start,
1331                                                 inline_size);
1332
1333                 if (ret != -ENOSPC)
1334                         goto out;
1335         }
1336
1337         /*
1338          * The inline space is filled up, so create a new block for it.
1339          * As the extent tree will be created, we have to save the inline
1340          * dir first.
1341          */
1342         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1343
1344 out:
1345         ext4_write_unlock_xattr(dir, &no_expand);
1346         ext4_mark_inode_dirty(handle, dir);
1347         brelse(iloc.bh);
1348         return ret;
1349 }
1350
1351 /*
1352  * This function fills a red-black tree with information from an
1353  * inlined dir.  It returns the number directory entries loaded
1354  * into the tree.  If there is an error it is returned in err.
1355  */
1356 int htree_inlinedir_to_tree(struct file *dir_file,
1357                             struct inode *dir, ext4_lblk_t block,
1358                             struct dx_hash_info *hinfo,
1359                             __u32 start_hash, __u32 start_minor_hash,
1360                             int *has_inline_data)
1361 {
1362         int err = 0, count = 0;
1363         unsigned int parent_ino;
1364         int pos;
1365         struct ext4_dir_entry_2 *de;
1366         struct inode *inode = file_inode(dir_file);
1367         int ret, inline_size = 0;
1368         struct ext4_iloc iloc;
1369         void *dir_buf = NULL;
1370         struct ext4_dir_entry_2 fake;
1371         struct fscrypt_str tmp_str;
1372
1373         ret = ext4_get_inode_loc(inode, &iloc);
1374         if (ret)
1375                 return ret;
1376
1377         down_read(&EXT4_I(inode)->xattr_sem);
1378         if (!ext4_has_inline_data(inode)) {
1379                 up_read(&EXT4_I(inode)->xattr_sem);
1380                 *has_inline_data = 0;
1381                 goto out;
1382         }
1383
1384         inline_size = ext4_get_inline_size(inode);
1385         dir_buf = kmalloc(inline_size, GFP_NOFS);
1386         if (!dir_buf) {
1387                 ret = -ENOMEM;
1388                 up_read(&EXT4_I(inode)->xattr_sem);
1389                 goto out;
1390         }
1391
1392         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1393         up_read(&EXT4_I(inode)->xattr_sem);
1394         if (ret < 0)
1395                 goto out;
1396
1397         pos = 0;
1398         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1399         while (pos < inline_size) {
1400                 /*
1401                  * As inlined dir doesn't store any information about '.' and
1402                  * only the inode number of '..' is stored, we have to handle
1403                  * them differently.
1404                  */
1405                 if (pos == 0) {
1406                         fake.inode = cpu_to_le32(inode->i_ino);
1407                         fake.name_len = 1;
1408                         strcpy(fake.name, ".");
1409                         fake.rec_len = ext4_rec_len_to_disk(
1410                                                 EXT4_DIR_REC_LEN(fake.name_len),
1411                                                 inline_size);
1412                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1413                         de = &fake;
1414                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1415                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1416                         fake.inode = cpu_to_le32(parent_ino);
1417                         fake.name_len = 2;
1418                         strcpy(fake.name, "..");
1419                         fake.rec_len = ext4_rec_len_to_disk(
1420                                                 EXT4_DIR_REC_LEN(fake.name_len),
1421                                                 inline_size);
1422                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1423                         de = &fake;
1424                         pos = EXT4_INLINE_DOTDOT_SIZE;
1425                 } else {
1426                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1427                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1428                         if (ext4_check_dir_entry(inode, dir_file, de,
1429                                          iloc.bh, dir_buf,
1430                                          inline_size, pos)) {
1431                                 ret = count;
1432                                 goto out;
1433                         }
1434                 }
1435
1436                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1437                 if ((hinfo->hash < start_hash) ||
1438                     ((hinfo->hash == start_hash) &&
1439                      (hinfo->minor_hash < start_minor_hash)))
1440                         continue;
1441                 if (de->inode == 0)
1442                         continue;
1443                 tmp_str.name = de->name;
1444                 tmp_str.len = de->name_len;
1445                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1446                                               hinfo->minor_hash, de, &tmp_str);
1447                 if (err) {
1448                         ret = err;
1449                         goto out;
1450                 }
1451                 count++;
1452         }
1453         ret = count;
1454 out:
1455         kfree(dir_buf);
1456         brelse(iloc.bh);
1457         return ret;
1458 }
1459
1460 /*
1461  * So this function is called when the volume is mkfsed with
1462  * dir_index disabled. In order to keep f_pos persistent
1463  * after we convert from an inlined dir to a blocked based,
1464  * we just pretend that we are a normal dir and return the
1465  * offset as if '.' and '..' really take place.
1466  *
1467  */
1468 int ext4_read_inline_dir(struct file *file,
1469                          struct dir_context *ctx,
1470                          int *has_inline_data)
1471 {
1472         unsigned int offset, parent_ino;
1473         int i;
1474         struct ext4_dir_entry_2 *de;
1475         struct super_block *sb;
1476         struct inode *inode = file_inode(file);
1477         int ret, inline_size = 0;
1478         struct ext4_iloc iloc;
1479         void *dir_buf = NULL;
1480         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1481
1482         ret = ext4_get_inode_loc(inode, &iloc);
1483         if (ret)
1484                 return ret;
1485
1486         down_read(&EXT4_I(inode)->xattr_sem);
1487         if (!ext4_has_inline_data(inode)) {
1488                 up_read(&EXT4_I(inode)->xattr_sem);
1489                 *has_inline_data = 0;
1490                 goto out;
1491         }
1492
1493         inline_size = ext4_get_inline_size(inode);
1494         dir_buf = kmalloc(inline_size, GFP_NOFS);
1495         if (!dir_buf) {
1496                 ret = -ENOMEM;
1497                 up_read(&EXT4_I(inode)->xattr_sem);
1498                 goto out;
1499         }
1500
1501         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1502         up_read(&EXT4_I(inode)->xattr_sem);
1503         if (ret < 0)
1504                 goto out;
1505
1506         ret = 0;
1507         sb = inode->i_sb;
1508         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1509         offset = ctx->pos;
1510
1511         /*
1512          * dotdot_offset and dotdot_size is the real offset and
1513          * size for ".." and "." if the dir is block based while
1514          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1515          * So we will use extra_offset and extra_size to indicate them
1516          * during the inline dir iteration.
1517          */
1518         dotdot_offset = EXT4_DIR_REC_LEN(1);
1519         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1520         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1521         extra_size = extra_offset + inline_size;
1522
1523         /*
1524          * If the version has changed since the last call to
1525          * readdir(2), then we might be pointing to an invalid
1526          * dirent right now.  Scan from the start of the inline
1527          * dir to make sure.
1528          */
1529         if (!inode_eq_iversion(inode, file->f_version)) {
1530                 for (i = 0; i < extra_size && i < offset;) {
1531                         /*
1532                          * "." is with offset 0 and
1533                          * ".." is dotdot_offset.
1534                          */
1535                         if (!i) {
1536                                 i = dotdot_offset;
1537                                 continue;
1538                         } else if (i == dotdot_offset) {
1539                                 i = dotdot_size;
1540                                 continue;
1541                         }
1542                         /* for other entry, the real offset in
1543                          * the buf has to be tuned accordingly.
1544                          */
1545                         de = (struct ext4_dir_entry_2 *)
1546                                 (dir_buf + i - extra_offset);
1547                         /* It's too expensive to do a full
1548                          * dirent test each time round this
1549                          * loop, but we do have to test at
1550                          * least that it is non-zero.  A
1551                          * failure will be detected in the
1552                          * dirent test below. */
1553                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1554                                 < EXT4_DIR_REC_LEN(1))
1555                                 break;
1556                         i += ext4_rec_len_from_disk(de->rec_len,
1557                                                     extra_size);
1558                 }
1559                 offset = i;
1560                 ctx->pos = offset;
1561                 file->f_version = inode_query_iversion(inode);
1562         }
1563
1564         while (ctx->pos < extra_size) {
1565                 if (ctx->pos == 0) {
1566                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1567                                 goto out;
1568                         ctx->pos = dotdot_offset;
1569                         continue;
1570                 }
1571
1572                 if (ctx->pos == dotdot_offset) {
1573                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1574                                 goto out;
1575                         ctx->pos = dotdot_size;
1576                         continue;
1577                 }
1578
1579                 de = (struct ext4_dir_entry_2 *)
1580                         (dir_buf + ctx->pos - extra_offset);
1581                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1582                                          extra_size, ctx->pos))
1583                         goto out;
1584                 if (le32_to_cpu(de->inode)) {
1585                         if (!dir_emit(ctx, de->name, de->name_len,
1586                                       le32_to_cpu(de->inode),
1587                                       get_dtype(sb, de->file_type)))
1588                                 goto out;
1589                 }
1590                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1591         }
1592 out:
1593         kfree(dir_buf);
1594         brelse(iloc.bh);
1595         return ret;
1596 }
1597
1598 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1599                                         struct ext4_dir_entry_2 **parent_de,
1600                                         int *retval)
1601 {
1602         struct ext4_iloc iloc;
1603
1604         *retval = ext4_get_inode_loc(inode, &iloc);
1605         if (*retval)
1606                 return NULL;
1607
1608         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1609
1610         return iloc.bh;
1611 }
1612
1613 /*
1614  * Try to create the inline data for the new dir.
1615  * If it succeeds, return 0, otherwise return the error.
1616  * In case of ENOSPC, the caller should create the normal disk layout dir.
1617  */
1618 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1619                                struct inode *inode)
1620 {
1621         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1622         struct ext4_iloc iloc;
1623         struct ext4_dir_entry_2 *de;
1624
1625         ret = ext4_get_inode_loc(inode, &iloc);
1626         if (ret)
1627                 return ret;
1628
1629         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1630         if (ret)
1631                 goto out;
1632
1633         /*
1634          * For inline dir, we only save the inode information for the ".."
1635          * and create a fake dentry to cover the left space.
1636          */
1637         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1638         de->inode = cpu_to_le32(parent->i_ino);
1639         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1640         de->inode = 0;
1641         de->rec_len = ext4_rec_len_to_disk(
1642                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1643                                 inline_size);
1644         set_nlink(inode, 2);
1645         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1646 out:
1647         brelse(iloc.bh);
1648         return ret;
1649 }
1650
1651 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1652                                         struct ext4_filename *fname,
1653                                         struct ext4_dir_entry_2 **res_dir,
1654                                         int *has_inline_data)
1655 {
1656         int ret;
1657         struct ext4_iloc iloc;
1658         void *inline_start;
1659         int inline_size;
1660
1661         if (ext4_get_inode_loc(dir, &iloc))
1662                 return NULL;
1663
1664         down_read(&EXT4_I(dir)->xattr_sem);
1665         if (!ext4_has_inline_data(dir)) {
1666                 *has_inline_data = 0;
1667                 goto out;
1668         }
1669
1670         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1671                                                 EXT4_INLINE_DOTDOT_SIZE;
1672         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1673         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1674                               dir, fname, 0, res_dir);
1675         if (ret == 1)
1676                 goto out_find;
1677         if (ret < 0)
1678                 goto out;
1679
1680         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1681                 goto out;
1682
1683         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1684         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1685
1686         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1687                               dir, fname, 0, res_dir);
1688         if (ret == 1)
1689                 goto out_find;
1690
1691 out:
1692         brelse(iloc.bh);
1693         iloc.bh = NULL;
1694 out_find:
1695         up_read(&EXT4_I(dir)->xattr_sem);
1696         return iloc.bh;
1697 }
1698
1699 int ext4_delete_inline_entry(handle_t *handle,
1700                              struct inode *dir,
1701                              struct ext4_dir_entry_2 *de_del,
1702                              struct buffer_head *bh,
1703                              int *has_inline_data)
1704 {
1705         int err, inline_size, no_expand;
1706         struct ext4_iloc iloc;
1707         void *inline_start;
1708
1709         err = ext4_get_inode_loc(dir, &iloc);
1710         if (err)
1711                 return err;
1712
1713         ext4_write_lock_xattr(dir, &no_expand);
1714         if (!ext4_has_inline_data(dir)) {
1715                 *has_inline_data = 0;
1716                 goto out;
1717         }
1718
1719         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1720                 EXT4_MIN_INLINE_DATA_SIZE) {
1721                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1722                                         EXT4_INLINE_DOTDOT_SIZE;
1723                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1724                                 EXT4_INLINE_DOTDOT_SIZE;
1725         } else {
1726                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1727                 inline_size = ext4_get_inline_size(dir) -
1728                                 EXT4_MIN_INLINE_DATA_SIZE;
1729         }
1730
1731         BUFFER_TRACE(bh, "get_write_access");
1732         err = ext4_journal_get_write_access(handle, bh);
1733         if (err)
1734                 goto out;
1735
1736         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1737                                         inline_start, inline_size, 0);
1738         if (err)
1739                 goto out;
1740
1741         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1742 out:
1743         ext4_write_unlock_xattr(dir, &no_expand);
1744         if (likely(err == 0))
1745                 err = ext4_mark_inode_dirty(handle, dir);
1746         brelse(iloc.bh);
1747         if (err != -ENOENT)
1748                 ext4_std_error(dir->i_sb, err);
1749         return err;
1750 }
1751
1752 /*
1753  * Get the inline dentry at offset.
1754  */
1755 static inline struct ext4_dir_entry_2 *
1756 ext4_get_inline_entry(struct inode *inode,
1757                       struct ext4_iloc *iloc,
1758                       unsigned int offset,
1759                       void **inline_start,
1760                       int *inline_size)
1761 {
1762         void *inline_pos;
1763
1764         BUG_ON(offset > ext4_get_inline_size(inode));
1765
1766         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1767                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1768                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1769         } else {
1770                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1771                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1772                 *inline_size = ext4_get_inline_size(inode) -
1773                                 EXT4_MIN_INLINE_DATA_SIZE;
1774         }
1775
1776         if (inline_start)
1777                 *inline_start = inline_pos;
1778         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1779 }
1780
1781 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1782 {
1783         int err, inline_size;
1784         struct ext4_iloc iloc;
1785         size_t inline_len;
1786         void *inline_pos;
1787         unsigned int offset;
1788         struct ext4_dir_entry_2 *de;
1789         bool ret = true;
1790
1791         err = ext4_get_inode_loc(dir, &iloc);
1792         if (err) {
1793                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1794                                  err, dir->i_ino);
1795                 return true;
1796         }
1797
1798         down_read(&EXT4_I(dir)->xattr_sem);
1799         if (!ext4_has_inline_data(dir)) {
1800                 *has_inline_data = 0;
1801                 goto out;
1802         }
1803
1804         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1805         if (!le32_to_cpu(de->inode)) {
1806                 ext4_warning(dir->i_sb,
1807                              "bad inline directory (dir #%lu) - no `..'",
1808                              dir->i_ino);
1809                 ret = true;
1810                 goto out;
1811         }
1812
1813         inline_len = ext4_get_inline_size(dir);
1814         offset = EXT4_INLINE_DOTDOT_SIZE;
1815         while (offset < inline_len) {
1816                 de = ext4_get_inline_entry(dir, &iloc, offset,
1817                                            &inline_pos, &inline_size);
1818                 if (ext4_check_dir_entry(dir, NULL, de,
1819                                          iloc.bh, inline_pos,
1820                                          inline_size, offset)) {
1821                         ext4_warning(dir->i_sb,
1822                                      "bad inline directory (dir #%lu) - "
1823                                      "inode %u, rec_len %u, name_len %d"
1824                                      "inline size %d",
1825                                      dir->i_ino, le32_to_cpu(de->inode),
1826                                      le16_to_cpu(de->rec_len), de->name_len,
1827                                      inline_size);
1828                         ret = true;
1829                         goto out;
1830                 }
1831                 if (le32_to_cpu(de->inode)) {
1832                         ret = false;
1833                         goto out;
1834                 }
1835                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1836         }
1837
1838 out:
1839         up_read(&EXT4_I(dir)->xattr_sem);
1840         brelse(iloc.bh);
1841         return ret;
1842 }
1843
1844 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1845 {
1846         int ret, no_expand;
1847
1848         ext4_write_lock_xattr(inode, &no_expand);
1849         ret = ext4_destroy_inline_data_nolock(handle, inode);
1850         ext4_write_unlock_xattr(inode, &no_expand);
1851
1852         return ret;
1853 }
1854
1855 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1856 {
1857         __u64 addr;
1858         int error = -EAGAIN;
1859         struct ext4_iloc iloc;
1860
1861         down_read(&EXT4_I(inode)->xattr_sem);
1862         if (!ext4_has_inline_data(inode))
1863                 goto out;
1864
1865         error = ext4_get_inode_loc(inode, &iloc);
1866         if (error)
1867                 goto out;
1868
1869         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1870         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1871         addr += offsetof(struct ext4_inode, i_block);
1872
1873         brelse(iloc.bh);
1874
1875         iomap->addr = addr;
1876         iomap->offset = 0;
1877         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1878                               i_size_read(inode));
1879         iomap->type = IOMAP_INLINE;
1880         iomap->flags = 0;
1881
1882 out:
1883         up_read(&EXT4_I(inode)->xattr_sem);
1884         return error;
1885 }
1886
1887 int ext4_inline_data_fiemap(struct inode *inode,
1888                             struct fiemap_extent_info *fieinfo,
1889                             int *has_inline, __u64 start, __u64 len)
1890 {
1891         __u64 physical = 0;
1892         __u64 inline_len;
1893         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1894                 FIEMAP_EXTENT_LAST;
1895         int error = 0;
1896         struct ext4_iloc iloc;
1897
1898         down_read(&EXT4_I(inode)->xattr_sem);
1899         if (!ext4_has_inline_data(inode)) {
1900                 *has_inline = 0;
1901                 goto out;
1902         }
1903         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1904                            i_size_read(inode));
1905         if (start >= inline_len)
1906                 goto out;
1907         if (start + len < inline_len)
1908                 inline_len = start + len;
1909         inline_len -= start;
1910
1911         error = ext4_get_inode_loc(inode, &iloc);
1912         if (error)
1913                 goto out;
1914
1915         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1916         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1917         physical += offsetof(struct ext4_inode, i_block);
1918
1919         brelse(iloc.bh);
1920 out:
1921         up_read(&EXT4_I(inode)->xattr_sem);
1922         if (physical)
1923                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1924                                                 inline_len, flags);
1925         return (error < 0 ? error : 0);
1926 }
1927
1928 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1929 {
1930         handle_t *handle;
1931         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1932         size_t i_size;
1933         void *value = NULL;
1934         struct ext4_xattr_ibody_find is = {
1935                 .s = { .not_found = -ENODATA, },
1936         };
1937         struct ext4_xattr_info i = {
1938                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1939                 .name = EXT4_XATTR_SYSTEM_DATA,
1940         };
1941
1942
1943         needed_blocks = ext4_writepage_trans_blocks(inode);
1944         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1945         if (IS_ERR(handle))
1946                 return PTR_ERR(handle);
1947
1948         ext4_write_lock_xattr(inode, &no_expand);
1949         if (!ext4_has_inline_data(inode)) {
1950                 ext4_write_unlock_xattr(inode, &no_expand);
1951                 *has_inline = 0;
1952                 ext4_journal_stop(handle);
1953                 return 0;
1954         }
1955
1956         if ((err = ext4_orphan_add(handle, inode)) != 0)
1957                 goto out;
1958
1959         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1960                 goto out;
1961
1962         down_write(&EXT4_I(inode)->i_data_sem);
1963         i_size = inode->i_size;
1964         inline_size = ext4_get_inline_size(inode);
1965         EXT4_I(inode)->i_disksize = i_size;
1966
1967         if (i_size < inline_size) {
1968                 /* Clear the content in the xattr space. */
1969                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1970                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1971                                 goto out_error;
1972
1973                         BUG_ON(is.s.not_found);
1974
1975                         value_len = le32_to_cpu(is.s.here->e_value_size);
1976                         value = kmalloc(value_len, GFP_NOFS);
1977                         if (!value) {
1978                                 err = -ENOMEM;
1979                                 goto out_error;
1980                         }
1981
1982                         err = ext4_xattr_ibody_get(inode, i.name_index,
1983                                                    i.name, value, value_len);
1984                         if (err <= 0)
1985                                 goto out_error;
1986
1987                         i.value = value;
1988                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1989                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1990                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1991                         if (err)
1992                                 goto out_error;
1993                 }
1994
1995                 /* Clear the content within i_blocks. */
1996                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1997                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1998                         memset(p + i_size, 0,
1999                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
2000                 }
2001
2002                 EXT4_I(inode)->i_inline_size = i_size <
2003                                         EXT4_MIN_INLINE_DATA_SIZE ?
2004                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2005         }
2006
2007 out_error:
2008         up_write(&EXT4_I(inode)->i_data_sem);
2009 out:
2010         brelse(is.iloc.bh);
2011         ext4_write_unlock_xattr(inode, &no_expand);
2012         kfree(value);
2013         if (inode->i_nlink)
2014                 ext4_orphan_del(handle, inode);
2015
2016         if (err == 0) {
2017                 inode->i_mtime = inode->i_ctime = current_time(inode);
2018                 err = ext4_mark_inode_dirty(handle, inode);
2019                 if (IS_SYNC(inode))
2020                         ext4_handle_sync(handle);
2021         }
2022         ext4_journal_stop(handle);
2023         return err;
2024 }
2025
2026 int ext4_convert_inline_data(struct inode *inode)
2027 {
2028         int error, needed_blocks, no_expand;
2029         handle_t *handle;
2030         struct ext4_iloc iloc;
2031
2032         if (!ext4_has_inline_data(inode)) {
2033                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2034                 return 0;
2035         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2036                 /*
2037                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2038                  * cleared. This means we are in the middle of moving of
2039                  * inline data to delay allocated block. Just force writeout
2040                  * here to finish conversion.
2041                  */
2042                 error = filemap_flush(inode->i_mapping);
2043                 if (error)
2044                         return error;
2045                 if (!ext4_has_inline_data(inode))
2046                         return 0;
2047         }
2048
2049         needed_blocks = ext4_writepage_trans_blocks(inode);
2050
2051         iloc.bh = NULL;
2052         error = ext4_get_inode_loc(inode, &iloc);
2053         if (error)
2054                 return error;
2055
2056         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2057         if (IS_ERR(handle)) {
2058                 error = PTR_ERR(handle);
2059                 goto out_free;
2060         }
2061
2062         ext4_write_lock_xattr(inode, &no_expand);
2063         if (ext4_has_inline_data(inode))
2064                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2065         ext4_write_unlock_xattr(inode, &no_expand);
2066         ext4_journal_stop(handle);
2067 out_free:
2068         brelse(iloc.bh);
2069         return error;
2070 }