fs/f2fs/inline.c

   1 /*
   2  * fs/f2fs/inline.c
   3  * Copyright (c) 2013, Intel Corporation
   4  * Authors: Huajun Li <huajun.li@intel.com>
   5  *          Haicheng Li <haicheng.li@intel.com>
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13
  14 #include "f2fs.h"
  15 #include "node.h"
  16
  17 bool f2fs_may_inline_data(struct inode *inode)
  18 {
  19         if (f2fs_is_atomic_file(inode))
  20                 return false;
  21
  22         if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
  23                 return false;
  24
  25         if (i_size_read(inode) > MAX_INLINE_DATA)
  26                 return false;
  27
  28         if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
  29                 return false;
  30
  31         return true;
  32 }
  33
  34 bool f2fs_may_inline_dentry(struct inode *inode)
  35 {
  36         if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
  37                 return false;
  38
  39         if (!S_ISDIR(inode->i_mode))
  40                 return false;
  41
  42         return true;
  43 }
  44
  45 void read_inline_data(struct page *page, struct page *ipage)
  46 {
  47         void *src_addr, *dst_addr;
  48
  49         if (PageUptodate(page))
  50                 return;
  51
  52         f2fs_bug_on(F2FS_P_SB(page), page->index);
  53
  54         zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);
  55
  56         /* Copy the whole inline data block */
  57         src_addr = inline_data_addr(ipage);
  58         dst_addr = kmap_atomic(page);
  59         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  60         flush_dcache_page(page);
  61         kunmap_atomic(dst_addr);
  62         if (!PageUptodate(page))
  63                 SetPageUptodate(page);
  64 }
  65
  66 bool truncate_inline_inode(struct page *ipage, u64 from)
  67 {
  68         void *addr;
  69
  70         if (from >= MAX_INLINE_DATA)
  71                 return false;
  72
  73         addr = inline_data_addr(ipage);
  74
  75         f2fs_wait_on_page_writeback(ipage, NODE, true);
  76         memset(addr + from, 0, MAX_INLINE_DATA - from);
  77         set_page_dirty(ipage);
  78         return true;
  79 }
  80
  81 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  82 {
  83         struct page *ipage;
  84
  85         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  86         if (IS_ERR(ipage)) {
  87                 unlock_page(page);
  88                 return PTR_ERR(ipage);
  89         }
  90
  91         if (!f2fs_has_inline_data(inode)) {
  92                 f2fs_put_page(ipage, 1);
  93                 return -EAGAIN;
  94         }
  95
  96         if (page->index)
  97                 zero_user_segment(page, 0, PAGE_SIZE);
  98         else
  99                 read_inline_data(page, ipage);
 100
 101         if (!PageUptodate(page))
 102                 SetPageUptodate(page);
 103         f2fs_put_page(ipage, 1);
 104         unlock_page(page);
 105         return 0;
 106 }
 107
 108 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 109 {
 110         struct f2fs_io_info fio = {
 111                 .sbi = F2FS_I_SB(dn->inode),
 112                 .type = DATA,
 113                 .op = REQ_OP_WRITE,
 114                 .op_flags = REQ_SYNC | REQ_PRIO,
 115                 .page = page,
 116                 .encrypted_page = NULL,
 117         };
 118         int dirty, err;
 119
 120         if (!f2fs_exist_data(dn->inode))
 121                 goto clear_out;
 122
 123         err = f2fs_reserve_block(dn, 0);
 124         if (err)
 125                 return err;
 126
 127         f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));
 128
 129         read_inline_data(page, dn->inode_page);
 130         set_page_dirty(page);
 131
 132         /* clear dirty state */
 133         dirty = clear_page_dirty_for_io(page);
 134
 135         /* write data page to try to make data consistent */
 136         set_page_writeback(page);
 137         fio.old_blkaddr = dn->data_blkaddr;
 138         write_data_page(dn, &fio);
 139         f2fs_wait_on_page_writeback(page, DATA, true);
 140         if (dirty) {
 141                 inode_dec_dirty_pages(dn->inode);
 142                 remove_dirty_inode(dn->inode);
 143         }
 144
 145         /* this converted inline_data should be recovered. */
 146         set_inode_flag(dn->inode, FI_APPEND_WRITE);
 147
 148         /* clear inline data and flag after data writeback */
 149         truncate_inline_inode(dn->inode_page, 0);
 150         clear_inline_node(dn->inode_page);
 151 clear_out:
 152         stat_dec_inline_inode(dn->inode);
 153         f2fs_clear_inline_inode(dn->inode);
 154         f2fs_put_dnode(dn);
 155         return 0;
 156 }
 157
 158 int f2fs_convert_inline_inode(struct inode *inode)
 159 {
 160         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 161         struct dnode_of_data dn;
 162         struct page *ipage, *page;
 163         int err = 0;
 164
 165         if (!f2fs_has_inline_data(inode))
 166                 return 0;
 167
 168         page = f2fs_grab_cache_page(inode->i_mapping, 0, false);
 169         if (!page)
 170                 return -ENOMEM;
 171
 172         f2fs_lock_op(sbi);
 173
 174         ipage = get_node_page(sbi, inode->i_ino);
 175         if (IS_ERR(ipage)) {
 176                 err = PTR_ERR(ipage);
 177                 goto out;
 178         }
 179
 180         set_new_dnode(&dn, inode, ipage, ipage, 0);
 181
 182         if (f2fs_has_inline_data(inode))
 183                 err = f2fs_convert_inline_page(&dn, page);
 184
 185         f2fs_put_dnode(&dn);
 186 out:
 187         f2fs_unlock_op(sbi);
 188
 189         f2fs_put_page(page, 1);
 190
 191         f2fs_balance_fs(sbi, dn.node_changed);
 192
 193         return err;
 194 }
 195
 196 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 197 {
 198         void *src_addr, *dst_addr;
 199         struct dnode_of_data dn;
 200         int err;
 201
 202         set_new_dnode(&dn, inode, NULL, NULL, 0);
 203         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 204         if (err)
 205                 return err;
 206
 207         if (!f2fs_has_inline_data(inode)) {
 208                 f2fs_put_dnode(&dn);
 209                 return -EAGAIN;
 210         }
 211
 212         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 213
 214         f2fs_wait_on_page_writeback(dn.inode_page, NODE, true);
 215         src_addr = kmap_atomic(page);
 216         dst_addr = inline_data_addr(dn.inode_page);
 217         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 218         kunmap_atomic(src_addr);
 219         set_page_dirty(dn.inode_page);
 220
 221         set_inode_flag(inode, FI_APPEND_WRITE);
 222         set_inode_flag(inode, FI_DATA_EXIST);
 223
 224         clear_inline_node(dn.inode_page);
 225         f2fs_put_dnode(&dn);
 226         return 0;
 227 }
 228
 229 bool recover_inline_data(struct inode *inode, struct page *npage)
 230 {
 231         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 232         struct f2fs_inode *ri = NULL;
 233         void *src_addr, *dst_addr;
 234         struct page *ipage;
 235
 236         /*
 237          * The inline_data recovery policy is as follows.
 238          * [prev.] [next] of inline_data flag
 239          *    o       o  -> recover inline_data
 240          *    o       x  -> remove inline_data, and then recover data blocks
 241          *    x       o  -> remove inline_data, and then recover inline_data
 242          *    x       x  -> recover data blocks
 243          */
 244         if (IS_INODE(npage))
 245                 ri = F2FS_INODE(npage);
 246
 247         if (f2fs_has_inline_data(inode) &&
 248                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 249 process_inline:
 250                 ipage = get_node_page(sbi, inode->i_ino);
 251                 f2fs_bug_on(sbi, IS_ERR(ipage));
 252
 253                 f2fs_wait_on_page_writeback(ipage, NODE, true);
 254
 255                 src_addr = inline_data_addr(npage);
 256                 dst_addr = inline_data_addr(ipage);
 257                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 258
 259                 set_inode_flag(inode, FI_INLINE_DATA);
 260                 set_inode_flag(inode, FI_DATA_EXIST);
 261
 262                 set_page_dirty(ipage);
 263                 f2fs_put_page(ipage, 1);
 264                 return true;
 265         }
 266
 267         if (f2fs_has_inline_data(inode)) {
 268                 ipage = get_node_page(sbi, inode->i_ino);
 269                 f2fs_bug_on(sbi, IS_ERR(ipage));
 270                 if (!truncate_inline_inode(ipage, 0))
 271                         return false;
 272                 f2fs_clear_inline_inode(inode);
 273                 f2fs_put_page(ipage, 1);
 274         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 275                 if (truncate_blocks(inode, 0, false))
 276                         return false;
 277                 goto process_inline;
 278         }
 279         return false;
 280 }
 281
 282 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 283                         struct fscrypt_name *fname, struct page **res_page)
 284 {
 285         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 286         struct f2fs_inline_dentry *inline_dentry;
 287         struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 288         struct f2fs_dir_entry *de;
 289         struct f2fs_dentry_ptr d;
 290         struct page *ipage;
 291         f2fs_hash_t namehash;
 292
 293         ipage = get_node_page(sbi, dir->i_ino);
 294         if (IS_ERR(ipage)) {
 295                 *res_page = ipage;
 296                 return NULL;
 297         }
 298
 299         namehash = f2fs_dentry_hash(&name);
 300
 301         inline_dentry = inline_data_addr(ipage);
 302
 303         make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
 304         de = find_target_dentry(fname, namehash, NULL, &d);
 305         unlock_page(ipage);
 306         if (de)
 307                 *res_page = ipage;
 308         else
 309                 f2fs_put_page(ipage, 0);
 310
 311         return de;
 312 }
 313
 314 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 315                                                         struct page *ipage)
 316 {
 317         struct f2fs_inline_dentry *dentry_blk;
 318         struct f2fs_dentry_ptr d;
 319
 320         dentry_blk = inline_data_addr(ipage);
 321
 322         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 323         do_make_empty_dir(inode, parent, &d);
 324
 325         set_page_dirty(ipage);
 326
 327         /* update i_size to MAX_INLINE_DATA */
 328         if (i_size_read(inode) < MAX_INLINE_DATA)
 329                 f2fs_i_size_write(inode, MAX_INLINE_DATA);
 330         return 0;
 331 }
 332
 333 /*
 334  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
 335  * release ipage in this function.
 336  */
 337 static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
 338                                 struct f2fs_inline_dentry *inline_dentry)
 339 {
 340         struct page *page;
 341         struct dnode_of_data dn;
 342         struct f2fs_dentry_block *dentry_blk;
 343         int err;
 344
 345         page = f2fs_grab_cache_page(dir->i_mapping, 0, false);
 346         if (!page) {
 347                 f2fs_put_page(ipage, 1);
 348                 return -ENOMEM;
 349         }
 350
 351         set_new_dnode(&dn, dir, ipage, NULL, 0);
 352         err = f2fs_reserve_block(&dn, 0);
 353         if (err)
 354                 goto out;
 355
 356         f2fs_wait_on_page_writeback(page, DATA, true);
 357         zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);
 358
 359         dentry_blk = kmap_atomic(page);
 360
 361         /* copy data from inline dentry block to new dentry block */
 362         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 363                                         INLINE_DENTRY_BITMAP_SIZE);
 364         memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
 365                         SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
 366         /*
 367          * we do not need to zero out remainder part of dentry and filename
 368          * field, since we have used bitmap for marking the usage status of
 369          * them, besides, we can also ignore copying/zeroing reserved space
 370          * of dentry block, because them haven't been used so far.
 371          */
 372         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 373                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 374         memcpy(dentry_blk->filename, inline_dentry->filename,
 375                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 376
 377         kunmap_atomic(dentry_blk);
 378         if (!PageUptodate(page))
 379                 SetPageUptodate(page);
 380         set_page_dirty(page);
 381
 382         /* clear inline dir and flag after data writeback */
 383         truncate_inline_inode(ipage, 0);
 384
 385         stat_dec_inline_dir(dir);
 386         clear_inode_flag(dir, FI_INLINE_DENTRY);
 387
 388         f2fs_i_depth_write(dir, 1);
 389         if (i_size_read(dir) < PAGE_SIZE)
 390                 f2fs_i_size_write(dir, PAGE_SIZE);
 391 out:
 392         f2fs_put_page(page, 1);
 393         return err;
 394 }
 395
 396 static int f2fs_add_inline_entries(struct inode *dir,
 397                         struct f2fs_inline_dentry *inline_dentry)
 398 {
 399         struct f2fs_dentry_ptr d;
 400         unsigned long bit_pos = 0;
 401         int err = 0;
 402
 403         make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
 404
 405         while (bit_pos < d.max) {
 406                 struct f2fs_dir_entry *de;
 407                 struct qstr new_name;
 408                 nid_t ino;
 409                 umode_t fake_mode;
 410
 411                 if (!test_bit_le(bit_pos, d.bitmap)) {
 412                         bit_pos++;
 413                         continue;
 414                 }
 415
 416                 de = &d.dentry[bit_pos];
 417
 418                 if (unlikely(!de->name_len)) {
 419                         bit_pos++;
 420                         continue;
 421                 }
 422
 423                 new_name.name = d.filename[bit_pos];
 424                 new_name.len = le16_to_cpu(de->name_len);
 425
 426                 ino = le32_to_cpu(de->ino);
 427                 fake_mode = get_de_type(de) << S_SHIFT;
 428
 429                 err = f2fs_add_regular_entry(dir, &new_name, NULL, NULL,
 430                                                         ino, fake_mode);
 431                 if (err)
 432                         goto punch_dentry_pages;
 433
 434                 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 435         }
 436         return 0;
 437 punch_dentry_pages:
 438         truncate_inode_pages(&dir->i_data, 0);
 439         truncate_blocks(dir, 0, false);
 440         remove_dirty_inode(dir);
 441         return err;
 442 }
 443
 444 static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
 445                                 struct f2fs_inline_dentry *inline_dentry)
 446 {
 447         struct f2fs_inline_dentry *backup_dentry;
 448         int err;
 449
 450         backup_dentry = f2fs_kmalloc(F2FS_I_SB(dir),
 451                         sizeof(struct f2fs_inline_dentry), GFP_F2FS_ZERO);
 452         if (!backup_dentry) {
 453                 f2fs_put_page(ipage, 1);
 454                 return -ENOMEM;
 455         }
 456
 457         memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA);
 458         truncate_inline_inode(ipage, 0);
 459
 460         unlock_page(ipage);
 461
 462         err = f2fs_add_inline_entries(dir, backup_dentry);
 463         if (err)
 464                 goto recover;
 465
 466         lock_page(ipage);
 467
 468         stat_dec_inline_dir(dir);
 469         clear_inode_flag(dir, FI_INLINE_DENTRY);
 470         kfree(backup_dentry);
 471         return 0;
 472 recover:
 473         lock_page(ipage);
 474         memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA);
 475         f2fs_i_depth_write(dir, 0);
 476         f2fs_i_size_write(dir, MAX_INLINE_DATA);
 477         set_page_dirty(ipage);
 478         f2fs_put_page(ipage, 1);
 479
 480         kfree(backup_dentry);
 481         return err;
 482 }
 483
 484 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 485                                 struct f2fs_inline_dentry *inline_dentry)
 486 {
 487         if (!F2FS_I(dir)->i_dir_level)
 488                 return f2fs_move_inline_dirents(dir, ipage, inline_dentry);
 489         else
 490                 return f2fs_move_rehashed_dirents(dir, ipage, inline_dentry);
 491 }
 492
 493 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
 494                                 const struct qstr *orig_name,
 495                                 struct inode *inode, nid_t ino, umode_t mode)
 496 {
 497         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 498         struct page *ipage;
 499         unsigned int bit_pos;
 500         f2fs_hash_t name_hash;
 501         struct f2fs_inline_dentry *dentry_blk = NULL;
 502         struct f2fs_dentry_ptr d;
 503         int slots = GET_DENTRY_SLOTS(new_name->len);
 504         struct page *page = NULL;
 505         int err = 0;
 506
 507         ipage = get_node_page(sbi, dir->i_ino);
 508         if (IS_ERR(ipage))
 509                 return PTR_ERR(ipage);
 510
 511         dentry_blk = inline_data_addr(ipage);
 512         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 513                                                 slots, NR_INLINE_DENTRY);
 514         if (bit_pos >= NR_INLINE_DENTRY) {
 515                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 516                 if (err)
 517                         return err;
 518                 err = -EAGAIN;
 519                 goto out;
 520         }
 521
 522         if (inode) {
 523                 down_write(&F2FS_I(inode)->i_sem);
 524                 page = init_inode_metadata(inode, dir, new_name,
 525                                                 orig_name, ipage);
 526                 if (IS_ERR(page)) {
 527                         err = PTR_ERR(page);
 528                         goto fail;
 529                 }
 530                 if (f2fs_encrypted_inode(dir))
 531                         file_set_enc_name(inode);
 532         }
 533
 534         f2fs_wait_on_page_writeback(ipage, NODE, true);
 535
 536         name_hash = f2fs_dentry_hash(new_name);
 537         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 538         f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos);
 539
 540         set_page_dirty(ipage);
 541
 542         /* we don't need to mark_inode_dirty now */
 543         if (inode) {
 544                 f2fs_i_pino_write(inode, dir->i_ino);
 545                 f2fs_put_page(page, 1);
 546         }
 547
 548         update_parent_metadata(dir, inode, 0);
 549 fail:
 550         if (inode)
 551                 up_write(&F2FS_I(inode)->i_sem);
 552 out:
 553         f2fs_put_page(ipage, 1);
 554         return err;
 555 }
 556
 557 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 558                                         struct inode *dir, struct inode *inode)
 559 {
 560         struct f2fs_inline_dentry *inline_dentry;
 561         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 562         unsigned int bit_pos;
 563         int i;
 564
 565         lock_page(page);
 566         f2fs_wait_on_page_writeback(page, NODE, true);
 567
 568         inline_dentry = inline_data_addr(page);
 569         bit_pos = dentry - inline_dentry->dentry;
 570         for (i = 0; i < slots; i++)
 571                 __clear_bit_le(bit_pos + i,
 572                                 &inline_dentry->dentry_bitmap);
 573
 574         set_page_dirty(page);
 575         f2fs_put_page(page, 1);
 576
 577         dir->i_ctime = dir->i_mtime = current_time(dir);
 578         f2fs_mark_inode_dirty_sync(dir, false);
 579
 580         if (inode)
 581                 f2fs_drop_nlink(dir, inode);
 582 }
 583
 584 bool f2fs_empty_inline_dir(struct inode *dir)
 585 {
 586         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 587         struct page *ipage;
 588         unsigned int bit_pos = 2;
 589         struct f2fs_inline_dentry *dentry_blk;
 590
 591         ipage = get_node_page(sbi, dir->i_ino);
 592         if (IS_ERR(ipage))
 593                 return false;
 594
 595         dentry_blk = inline_data_addr(ipage);
 596         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 597                                         NR_INLINE_DENTRY,
 598                                         bit_pos);
 599
 600         f2fs_put_page(ipage, 1);
 601
 602         if (bit_pos < NR_INLINE_DENTRY)
 603                 return false;
 604
 605         return true;
 606 }
 607
 608 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 609                                 struct fscrypt_str *fstr)
 610 {
 611         struct inode *inode = file_inode(file);
 612         struct f2fs_inline_dentry *inline_dentry = NULL;
 613         struct page *ipage = NULL;
 614         struct f2fs_dentry_ptr d;
 615         int err;
 616
 617         if (ctx->pos == NR_INLINE_DENTRY)
 618                 return 0;
 619
 620         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 621         if (IS_ERR(ipage))
 622                 return PTR_ERR(ipage);
 623
 624         inline_dentry = inline_data_addr(ipage);
 625
 626         make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);
 627
 628         err = f2fs_fill_dentries(ctx, &d, 0, fstr);
 629         if (!err)
 630                 ctx->pos = NR_INLINE_DENTRY;
 631
 632         f2fs_put_page(ipage, 1);
 633         return err < 0 ? err : 0;
 634 }
 635
 636 int f2fs_inline_data_fiemap(struct inode *inode,
 637                 struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
 638 {
 639         __u64 byteaddr, ilen;
 640         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
 641                 FIEMAP_EXTENT_LAST;
 642         struct node_info ni;
 643         struct page *ipage;
 644         int err = 0;
 645
 646         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 647         if (IS_ERR(ipage))
 648                 return PTR_ERR(ipage);
 649
 650         if (!f2fs_has_inline_data(inode)) {
 651                 err = -EAGAIN;
 652                 goto out;
 653         }
 654
 655         ilen = min_t(size_t, MAX_INLINE_DATA, i_size_read(inode));
 656         if (start >= ilen)
 657                 goto out;
 658         if (start + len < ilen)
 659                 ilen = start + len;
 660         ilen -= start;
 661
 662         get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
 663         byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
 664         byteaddr += (char *)inline_data_addr(ipage) - (char *)F2FS_INODE(ipage);
 665         err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
 666 out:
 667         f2fs_put_page(ipage, 1);
 668         return err;
 669 }