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 void truncate_inline_inode(struct inode *inode, struct page *ipage, u64 from)
  67 {
  68         void *addr;
  69
  70         if (from >= MAX_INLINE_DATA)
  71                 return;
  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
  79         if (from == 0)
  80                 clear_inode_flag(inode, FI_DATA_EXIST);
  81 }
  82
  83 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  84 {
  85         struct page *ipage;
  86
  87         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  88         if (IS_ERR(ipage)) {
  89                 unlock_page(page);
  90                 return PTR_ERR(ipage);
  91         }
  92
  93         if (!f2fs_has_inline_data(inode)) {
  94                 f2fs_put_page(ipage, 1);
  95                 return -EAGAIN;
  96         }
  97
  98         if (page->index)
  99                 zero_user_segment(page, 0, PAGE_SIZE);
 100         else
 101                 read_inline_data(page, ipage);
 102
 103         if (!PageUptodate(page))
 104                 SetPageUptodate(page);
 105         f2fs_put_page(ipage, 1);
 106         unlock_page(page);
 107         return 0;
 108 }
 109
 110 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 111 {
 112         struct f2fs_io_info fio = {
 113                 .sbi = F2FS_I_SB(dn->inode),
 114                 .type = DATA,
 115                 .op = REQ_OP_WRITE,
 116                 .op_flags = REQ_SYNC | REQ_PRIO,
 117                 .page = page,
 118                 .encrypted_page = NULL,
 119         };
 120         int dirty, err;
 121
 122         if (!f2fs_exist_data(dn->inode))
 123                 goto clear_out;
 124
 125         err = f2fs_reserve_block(dn, 0);
 126         if (err)
 127                 return err;
 128
 129         f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));
 130
 131         read_inline_data(page, dn->inode_page);
 132         set_page_dirty(page);
 133
 134         /* clear dirty state */
 135         dirty = clear_page_dirty_for_io(page);
 136
 137         /* write data page to try to make data consistent */
 138         set_page_writeback(page);
 139         fio.old_blkaddr = dn->data_blkaddr;
 140         set_inode_flag(dn->inode, FI_HOT_DATA);
 141         write_data_page(dn, &fio);
 142         f2fs_wait_on_page_writeback(page, DATA, true);
 143         if (dirty) {
 144                 inode_dec_dirty_pages(dn->inode);
 145                 remove_dirty_inode(dn->inode);
 146         }
 147
 148         /* this converted inline_data should be recovered. */
 149         set_inode_flag(dn->inode, FI_APPEND_WRITE);
 150
 151         /* clear inline data and flag after data writeback */
 152         truncate_inline_inode(dn->inode, dn->inode_page, 0);
 153         clear_inline_node(dn->inode_page);
 154 clear_out:
 155         stat_dec_inline_inode(dn->inode);
 156         clear_inode_flag(dn->inode, FI_INLINE_DATA);
 157         f2fs_put_dnode(dn);
 158         return 0;
 159 }
 160
 161 int f2fs_convert_inline_inode(struct inode *inode)
 162 {
 163         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 164         struct dnode_of_data dn;
 165         struct page *ipage, *page;
 166         int err = 0;
 167
 168         if (!f2fs_has_inline_data(inode))
 169                 return 0;
 170
 171         page = f2fs_grab_cache_page(inode->i_mapping, 0, false);
 172         if (!page)
 173                 return -ENOMEM;
 174
 175         f2fs_lock_op(sbi);
 176
 177         ipage = get_node_page(sbi, inode->i_ino);
 178         if (IS_ERR(ipage)) {
 179                 err = PTR_ERR(ipage);
 180                 goto out;
 181         }
 182
 183         set_new_dnode(&dn, inode, ipage, ipage, 0);
 184
 185         if (f2fs_has_inline_data(inode))
 186                 err = f2fs_convert_inline_page(&dn, page);
 187
 188         f2fs_put_dnode(&dn);
 189 out:
 190         f2fs_unlock_op(sbi);
 191
 192         f2fs_put_page(page, 1);
 193
 194         f2fs_balance_fs(sbi, dn.node_changed);
 195
 196         return err;
 197 }
 198
 199 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 200 {
 201         void *src_addr, *dst_addr;
 202         struct dnode_of_data dn;
 203         int err;
 204
 205         set_new_dnode(&dn, inode, NULL, NULL, 0);
 206         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 207         if (err)
 208                 return err;
 209
 210         if (!f2fs_has_inline_data(inode)) {
 211                 f2fs_put_dnode(&dn);
 212                 return -EAGAIN;
 213         }
 214
 215         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 216
 217         f2fs_wait_on_page_writeback(dn.inode_page, NODE, true);
 218         src_addr = kmap_atomic(page);
 219         dst_addr = inline_data_addr(dn.inode_page);
 220         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 221         kunmap_atomic(src_addr);
 222         set_page_dirty(dn.inode_page);
 223
 224         set_inode_flag(inode, FI_APPEND_WRITE);
 225         set_inode_flag(inode, FI_DATA_EXIST);
 226
 227         clear_inline_node(dn.inode_page);
 228         f2fs_put_dnode(&dn);
 229         return 0;
 230 }
 231
 232 bool recover_inline_data(struct inode *inode, struct page *npage)
 233 {
 234         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 235         struct f2fs_inode *ri = NULL;
 236         void *src_addr, *dst_addr;
 237         struct page *ipage;
 238
 239         /*
 240          * The inline_data recovery policy is as follows.
 241          * [prev.] [next] of inline_data flag
 242          *    o       o  -> recover inline_data
 243          *    o       x  -> remove inline_data, and then recover data blocks
 244          *    x       o  -> remove inline_data, and then recover inline_data
 245          *    x       x  -> recover data blocks
 246          */
 247         if (IS_INODE(npage))
 248                 ri = F2FS_INODE(npage);
 249
 250         if (f2fs_has_inline_data(inode) &&
 251                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 252 process_inline:
 253                 ipage = get_node_page(sbi, inode->i_ino);
 254                 f2fs_bug_on(sbi, IS_ERR(ipage));
 255
 256                 f2fs_wait_on_page_writeback(ipage, NODE, true);
 257
 258                 src_addr = inline_data_addr(npage);
 259                 dst_addr = inline_data_addr(ipage);
 260                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 261
 262                 set_inode_flag(inode, FI_INLINE_DATA);
 263                 set_inode_flag(inode, FI_DATA_EXIST);
 264
 265                 set_page_dirty(ipage);
 266                 f2fs_put_page(ipage, 1);
 267                 return true;
 268         }
 269
 270         if (f2fs_has_inline_data(inode)) {
 271                 ipage = get_node_page(sbi, inode->i_ino);
 272                 f2fs_bug_on(sbi, IS_ERR(ipage));
 273                 truncate_inline_inode(inode, ipage, 0);
 274                 clear_inode_flag(inode, FI_INLINE_DATA);
 275                 f2fs_put_page(ipage, 1);
 276         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 277                 if (truncate_blocks(inode, 0, false))
 278                         return false;
 279                 goto process_inline;
 280         }
 281         return false;
 282 }
 283
 284 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 285                         struct fscrypt_name *fname, struct page **res_page)
 286 {
 287         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 288         struct f2fs_inline_dentry *inline_dentry;
 289         struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 290         struct f2fs_dir_entry *de;
 291         struct f2fs_dentry_ptr d;
 292         struct page *ipage;
 293         f2fs_hash_t namehash;
 294
 295         ipage = get_node_page(sbi, dir->i_ino);
 296         if (IS_ERR(ipage)) {
 297                 *res_page = ipage;
 298                 return NULL;
 299         }
 300
 301         namehash = f2fs_dentry_hash(&name, fname);
 302
 303         inline_dentry = inline_data_addr(ipage);
 304
 305         make_dentry_ptr_inline(NULL, &d, inline_dentry);
 306         de = find_target_dentry(fname, namehash, NULL, &d);
 307         unlock_page(ipage);
 308         if (de)
 309                 *res_page = ipage;
 310         else
 311                 f2fs_put_page(ipage, 0);
 312
 313         return de;
 314 }
 315
 316 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 317                                                         struct page *ipage)
 318 {
 319         struct f2fs_inline_dentry *inline_dentry;
 320         struct f2fs_dentry_ptr d;
 321
 322         inline_dentry = inline_data_addr(ipage);
 323
 324         make_dentry_ptr_inline(NULL, &d, inline_dentry);
 325         do_make_empty_dir(inode, parent, &d);
 326
 327         set_page_dirty(ipage);
 328
 329         /* update i_size to MAX_INLINE_DATA */
 330         if (i_size_read(inode) < MAX_INLINE_DATA)
 331                 f2fs_i_size_write(inode, MAX_INLINE_DATA);
 332         return 0;
 333 }
 334
 335 /*
 336  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
 337  * release ipage in this function.
 338  */
 339 static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
 340                                 struct f2fs_inline_dentry *inline_dentry)
 341 {
 342         struct page *page;
 343         struct dnode_of_data dn;
 344         struct f2fs_dentry_block *dentry_blk;
 345         int err;
 346
 347         page = f2fs_grab_cache_page(dir->i_mapping, 0, false);
 348         if (!page) {
 349                 f2fs_put_page(ipage, 1);
 350                 return -ENOMEM;
 351         }
 352
 353         set_new_dnode(&dn, dir, ipage, NULL, 0);
 354         err = f2fs_reserve_block(&dn, 0);
 355         if (err)
 356                 goto out;
 357
 358         f2fs_wait_on_page_writeback(page, DATA, true);
 359         zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);
 360
 361         dentry_blk = kmap_atomic(page);
 362
 363         /* copy data from inline dentry block to new dentry block */
 364         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 365                                         INLINE_DENTRY_BITMAP_SIZE);
 366         memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
 367                         SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
 368         /*
 369          * we do not need to zero out remainder part of dentry and filename
 370          * field, since we have used bitmap for marking the usage status of
 371          * them, besides, we can also ignore copying/zeroing reserved space
 372          * of dentry block, because them haven't been used so far.
 373          */
 374         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 375                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 376         memcpy(dentry_blk->filename, inline_dentry->filename,
 377                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 378
 379         kunmap_atomic(dentry_blk);
 380         if (!PageUptodate(page))
 381                 SetPageUptodate(page);
 382         set_page_dirty(page);
 383
 384         /* clear inline dir and flag after data writeback */
 385         truncate_inline_inode(dir, ipage, 0);
 386
 387         stat_dec_inline_dir(dir);
 388         clear_inode_flag(dir, FI_INLINE_DENTRY);
 389
 390         f2fs_i_depth_write(dir, 1);
 391         if (i_size_read(dir) < PAGE_SIZE)
 392                 f2fs_i_size_write(dir, PAGE_SIZE);
 393 out:
 394         f2fs_put_page(page, 1);
 395         return err;
 396 }
 397
 398 static int f2fs_add_inline_entries(struct inode *dir,
 399                         struct f2fs_inline_dentry *inline_dentry)
 400 {
 401         struct f2fs_dentry_ptr d;
 402         unsigned long bit_pos = 0;
 403         int err = 0;
 404
 405         make_dentry_ptr_inline(NULL, &d, inline_dentry);
 406
 407         while (bit_pos < d.max) {
 408                 struct f2fs_dir_entry *de;
 409                 struct qstr new_name;
 410                 nid_t ino;
 411                 umode_t fake_mode;
 412
 413                 if (!test_bit_le(bit_pos, d.bitmap)) {
 414                         bit_pos++;
 415                         continue;
 416                 }
 417
 418                 de = &d.dentry[bit_pos];
 419
 420                 if (unlikely(!de->name_len)) {
 421                         bit_pos++;
 422                         continue;
 423                 }
 424
 425                 new_name.name = d.filename[bit_pos];
 426                 new_name.len = le16_to_cpu(de->name_len);
 427
 428                 ino = le32_to_cpu(de->ino);
 429                 fake_mode = get_de_type(de) << S_SHIFT;
 430
 431                 err = f2fs_add_regular_entry(dir, &new_name, NULL, NULL,
 432                                                         ino, fake_mode);
 433                 if (err)
 434                         goto punch_dentry_pages;
 435
 436                 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 437         }
 438         return 0;
 439 punch_dentry_pages:
 440         truncate_inode_pages(&dir->i_data, 0);
 441         truncate_blocks(dir, 0, false);
 442         remove_dirty_inode(dir);
 443         return err;
 444 }
 445
 446 static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
 447                                 struct f2fs_inline_dentry *inline_dentry)
 448 {
 449         struct f2fs_inline_dentry *backup_dentry;
 450         int err;
 451
 452         backup_dentry = f2fs_kmalloc(F2FS_I_SB(dir),
 453                         sizeof(struct f2fs_inline_dentry), GFP_F2FS_ZERO);
 454         if (!backup_dentry) {
 455                 f2fs_put_page(ipage, 1);
 456                 return -ENOMEM;
 457         }
 458
 459         memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA);
 460         truncate_inline_inode(dir, ipage, 0);
 461
 462         unlock_page(ipage);
 463
 464         err = f2fs_add_inline_entries(dir, backup_dentry);
 465         if (err)
 466                 goto recover;
 467
 468         lock_page(ipage);
 469
 470         stat_dec_inline_dir(dir);
 471         clear_inode_flag(dir, FI_INLINE_DENTRY);
 472         kfree(backup_dentry);
 473         return 0;
 474 recover:
 475         lock_page(ipage);
 476         memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA);
 477         f2fs_i_depth_write(dir, 0);
 478         f2fs_i_size_write(dir, MAX_INLINE_DATA);
 479         set_page_dirty(ipage);
 480         f2fs_put_page(ipage, 1);
 481
 482         kfree(backup_dentry);
 483         return err;
 484 }
 485
 486 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 487                                 struct f2fs_inline_dentry *inline_dentry)
 488 {
 489         if (!F2FS_I(dir)->i_dir_level)
 490                 return f2fs_move_inline_dirents(dir, ipage, inline_dentry);
 491         else
 492                 return f2fs_move_rehashed_dirents(dir, ipage, inline_dentry);
 493 }
 494
 495 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
 496                                 const struct qstr *orig_name,
 497                                 struct inode *inode, nid_t ino, umode_t mode)
 498 {
 499         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 500         struct page *ipage;
 501         unsigned int bit_pos;
 502         f2fs_hash_t name_hash;
 503         struct f2fs_inline_dentry *inline_dentry = NULL;
 504         struct f2fs_dentry_ptr d;
 505         int slots = GET_DENTRY_SLOTS(new_name->len);
 506         struct page *page = NULL;
 507         int err = 0;
 508
 509         ipage = get_node_page(sbi, dir->i_ino);
 510         if (IS_ERR(ipage))
 511                 return PTR_ERR(ipage);
 512
 513         inline_dentry = inline_data_addr(ipage);
 514         bit_pos = room_for_filename(&inline_dentry->dentry_bitmap,
 515                                                 slots, NR_INLINE_DENTRY);
 516         if (bit_pos >= NR_INLINE_DENTRY) {
 517                 err = f2fs_convert_inline_dir(dir, ipage, inline_dentry);
 518                 if (err)
 519                         return err;
 520                 err = -EAGAIN;
 521                 goto out;
 522         }
 523
 524         if (inode) {
 525                 down_write(&F2FS_I(inode)->i_sem);
 526                 page = init_inode_metadata(inode, dir, new_name,
 527                                                 orig_name, ipage);
 528                 if (IS_ERR(page)) {
 529                         err = PTR_ERR(page);
 530                         goto fail;
 531                 }
 532         }
 533
 534         f2fs_wait_on_page_writeback(ipage, NODE, true);
 535
 536         name_hash = f2fs_dentry_hash(new_name, NULL);
 537         make_dentry_ptr_inline(NULL, &d, inline_dentry);
 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 *inline_dentry;
 590
 591         ipage = get_node_page(sbi, dir->i_ino);
 592         if (IS_ERR(ipage))
 593                 return false;
 594
 595         inline_dentry = inline_data_addr(ipage);
 596         bit_pos = find_next_bit_le(&inline_dentry->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_inline(inode, &d, inline_dentry);
 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 }