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