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
  16 bool f2fs_may_inline(struct inode *inode)
  17 {
  18         block_t nr_blocks;
  19         loff_t i_size;
  20
  21         if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
  22                 return false;
  23
  24         if (f2fs_is_atomic_file(inode))
  25                 return false;
  26
  27         nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
  28         if (inode->i_blocks > nr_blocks)
  29                 return false;
  30
  31         i_size = i_size_read(inode);
  32         if (i_size > MAX_INLINE_DATA)
  33                 return false;
  34
  35         return true;
  36 }
  37
  38 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  39 {
  40         struct page *ipage;
  41         void *src_addr, *dst_addr;
  42
  43         if (page->index) {
  44                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  45                 goto out;
  46         }
  47
  48         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  49         if (IS_ERR(ipage)) {
  50                 unlock_page(page);
  51                 return PTR_ERR(ipage);
  52         }
  53
  54         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
  55
  56         /* Copy the whole inline data block */
  57         src_addr = inline_data_addr(ipage);
  58         dst_addr = kmap(page);
  59         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  60         kunmap(page);
  61         f2fs_put_page(ipage, 1);
  62
  63 out:
  64         SetPageUptodate(page);
  65         unlock_page(page);
  66
  67         return 0;
  68 }
  69
  70 static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
  71 {
  72         int err = 0;
  73         struct page *ipage;
  74         struct dnode_of_data dn;
  75         void *src_addr, *dst_addr;
  76         block_t new_blk_addr;
  77         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  78         struct f2fs_io_info fio = {
  79                 .type = DATA,
  80                 .rw = WRITE_SYNC | REQ_PRIO,
  81         };
  82
  83         f2fs_lock_op(sbi);
  84         ipage = get_node_page(sbi, inode->i_ino);
  85         if (IS_ERR(ipage)) {
  86                 err = PTR_ERR(ipage);
  87                 goto out;
  88         }
  89
  90         /* someone else converted inline_data already */
  91         if (!f2fs_has_inline_data(inode))
  92                 goto out;
  93
  94         /*
  95          * i_addr[0] is not used for inline data,
  96          * so reserving new block will not destroy inline data
  97          */
  98         set_new_dnode(&dn, inode, ipage, NULL, 0);
  99         err = f2fs_reserve_block(&dn, 0);
 100         if (err)
 101                 goto out;
 102
 103         f2fs_wait_on_page_writeback(page, DATA);
 104         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 105
 106         /* Copy the whole inline data block */
 107         src_addr = inline_data_addr(ipage);
 108         dst_addr = kmap(page);
 109         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 110         kunmap(page);
 111         SetPageUptodate(page);
 112
 113         /* write data page to try to make data consistent */
 114         set_page_writeback(page);
 115         write_data_page(page, &dn, &new_blk_addr, &fio);
 116         update_extent_cache(new_blk_addr, &dn);
 117         f2fs_wait_on_page_writeback(page, DATA);
 118
 119         /* clear inline data and flag after data writeback */
 120         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 121                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 122         clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 123         stat_dec_inline_inode(inode);
 124
 125         sync_inode_page(&dn);
 126         f2fs_put_dnode(&dn);
 127 out:
 128         f2fs_unlock_op(sbi);
 129         return err;
 130 }
 131
 132 int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size,
 133                                                 struct page *page)
 134 {
 135         struct page *new_page = page;
 136         int err;
 137
 138         if (!f2fs_has_inline_data(inode))
 139                 return 0;
 140         else if (to_size <= MAX_INLINE_DATA)
 141                 return 0;
 142
 143         if (!page || page->index != 0) {
 144                 new_page = grab_cache_page(inode->i_mapping, 0);
 145                 if (!new_page)
 146                         return -ENOMEM;
 147         }
 148
 149         err = __f2fs_convert_inline_data(inode, new_page);
 150         if (!page || page->index != 0)
 151                 f2fs_put_page(new_page, 1);
 152         return err;
 153 }
 154
 155 int f2fs_write_inline_data(struct inode *inode,
 156                                 struct page *page, unsigned size)
 157 {
 158         void *src_addr, *dst_addr;
 159         struct page *ipage;
 160         struct dnode_of_data dn;
 161         int err;
 162
 163         set_new_dnode(&dn, inode, NULL, NULL, 0);
 164         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 165         if (err)
 166                 return err;
 167         ipage = dn.inode_page;
 168
 169         /* Release any data block if it is allocated */
 170         if (!f2fs_has_inline_data(inode)) {
 171                 int count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 172                 truncate_data_blocks_range(&dn, count);
 173                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 174                 stat_inc_inline_inode(inode);
 175         }
 176
 177         f2fs_wait_on_page_writeback(ipage, NODE);
 178         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 179                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 180         src_addr = kmap(page);
 181         dst_addr = inline_data_addr(ipage);
 182         memcpy(dst_addr, src_addr, size);
 183         kunmap(page);
 184
 185         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 186         sync_inode_page(&dn);
 187         f2fs_put_dnode(&dn);
 188
 189         return 0;
 190 }
 191
 192 void truncate_inline_data(struct inode *inode, u64 from)
 193 {
 194         struct page *ipage;
 195
 196         if (from >= MAX_INLINE_DATA)
 197                 return;
 198
 199         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 200         if (IS_ERR(ipage))
 201                 return;
 202
 203         f2fs_wait_on_page_writeback(ipage, NODE);
 204
 205         zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
 206                                 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 207         set_page_dirty(ipage);
 208         f2fs_put_page(ipage, 1);
 209 }
 210
 211 bool recover_inline_data(struct inode *inode, struct page *npage)
 212 {
 213         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 214         struct f2fs_inode *ri = NULL;
 215         void *src_addr, *dst_addr;
 216         struct page *ipage;
 217
 218         /*
 219          * The inline_data recovery policy is as follows.
 220          * [prev.] [next] of inline_data flag
 221          *    o       o  -> recover inline_data
 222          *    o       x  -> remove inline_data, and then recover data blocks
 223          *    x       o  -> remove inline_data, and then recover inline_data
 224          *    x       x  -> recover data blocks
 225          */
 226         if (IS_INODE(npage))
 227                 ri = F2FS_INODE(npage);
 228
 229         if (f2fs_has_inline_data(inode) &&
 230                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 231 process_inline:
 232                 ipage = get_node_page(sbi, inode->i_ino);
 233                 f2fs_bug_on(sbi, IS_ERR(ipage));
 234
 235                 f2fs_wait_on_page_writeback(ipage, NODE);
 236
 237                 src_addr = inline_data_addr(npage);
 238                 dst_addr = inline_data_addr(ipage);
 239                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 240                 update_inode(inode, ipage);
 241                 f2fs_put_page(ipage, 1);
 242                 return true;
 243         }
 244
 245         if (f2fs_has_inline_data(inode)) {
 246                 ipage = get_node_page(sbi, inode->i_ino);
 247                 f2fs_bug_on(sbi, IS_ERR(ipage));
 248                 f2fs_wait_on_page_writeback(ipage, NODE);
 249                 zero_user_segment(ipage, INLINE_DATA_OFFSET,
 250                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 251                 clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 252                 update_inode(inode, ipage);
 253                 f2fs_put_page(ipage, 1);
 254         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 255                 truncate_blocks(inode, 0, false);
 256                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 257                 goto process_inline;
 258         }
 259         return false;
 260 }
 261
 262 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 263                                 struct qstr *name, struct page **res_page)
 264 {
 265         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 266         struct f2fs_inline_dentry *inline_dentry;
 267         struct f2fs_dir_entry *de;
 268         struct page *ipage;
 269         int max_slots = NR_INLINE_DENTRY;
 270
 271         ipage = get_node_page(sbi, dir->i_ino);
 272         if (IS_ERR(ipage))
 273                 return NULL;
 274
 275         inline_dentry = inline_data_addr(ipage);
 276
 277         de = find_target_dentry(name, &max_slots, &inline_dentry->dentry_bitmap,
 278                                                 inline_dentry->dentry,
 279                                                 inline_dentry->filename);
 280         unlock_page(ipage);
 281         if (de)
 282                 *res_page = ipage;
 283         else
 284                 f2fs_put_page(ipage, 0);
 285
 286         /*
 287          * For the most part, it should be a bug when name_len is zero.
 288          * We stop here for figuring out where the bugs has occurred.
 289          */
 290         f2fs_bug_on(sbi, max_slots < 0);
 291         return de;
 292 }
 293
 294 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 295                                                         struct page **p)
 296 {
 297         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 298         struct page *ipage;
 299         struct f2fs_dir_entry *de;
 300         struct f2fs_inline_dentry *dentry_blk;
 301
 302         ipage = get_node_page(sbi, dir->i_ino);
 303         if (IS_ERR(ipage))
 304                 return NULL;
 305
 306         dentry_blk = inline_data_addr(ipage);
 307         de = &dentry_blk->dentry[1];
 308         *p = ipage;
 309         unlock_page(ipage);
 310         return de;
 311 }
 312
 313 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 314                                                         struct page *ipage)
 315 {
 316         struct f2fs_inline_dentry *dentry_blk;
 317         struct f2fs_dir_entry *de;
 318
 319         dentry_blk = inline_data_addr(ipage);
 320
 321         de = &dentry_blk->dentry[0];
 322         de->name_len = cpu_to_le16(1);
 323         de->hash_code = 0;
 324         de->ino = cpu_to_le32(inode->i_ino);
 325         memcpy(dentry_blk->filename[0], ".", 1);
 326         set_de_type(de, inode);
 327
 328         de = &dentry_blk->dentry[1];
 329         de->hash_code = 0;
 330         de->name_len = cpu_to_le16(2);
 331         de->ino = cpu_to_le32(parent->i_ino);
 332         memcpy(dentry_blk->filename[1], "..", 2);
 333         set_de_type(de, inode);
 334
 335         test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
 336         test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
 337
 338         set_page_dirty(ipage);
 339
 340         /* update i_size to MAX_INLINE_DATA */
 341         if (i_size_read(inode) < MAX_INLINE_DATA) {
 342                 i_size_write(inode, MAX_INLINE_DATA);
 343                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 344         }
 345         return 0;
 346 }
 347
 348 int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 349                                 struct f2fs_inline_dentry *inline_dentry)
 350 {
 351         struct page *page;
 352         struct dnode_of_data dn;
 353         struct f2fs_dentry_block *dentry_blk;
 354         int err;
 355
 356         page = grab_cache_page(dir->i_mapping, 0);
 357         if (!page)
 358                 return -ENOMEM;
 359
 360         set_new_dnode(&dn, dir, ipage, NULL, 0);
 361         err = f2fs_reserve_block(&dn, 0);
 362         if (err)
 363                 goto out;
 364
 365         f2fs_wait_on_page_writeback(page, DATA);
 366         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 367
 368         dentry_blk = kmap(page);
 369
 370         /* copy data from inline dentry block to new dentry block */
 371         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 372                                         INLINE_DENTRY_BITMAP_SIZE);
 373         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 374                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 375         memcpy(dentry_blk->filename, inline_dentry->filename,
 376                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 377
 378         kunmap(page);
 379         SetPageUptodate(page);
 380         set_page_dirty(page);
 381
 382         /* clear inline dir and flag after data writeback */
 383         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 384                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 385         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 386         stat_dec_inline_inode(dir);
 387
 388         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 389                 i_size_write(dir, PAGE_CACHE_SIZE);
 390                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 391         }
 392
 393         sync_inode_page(&dn);
 394 out:
 395         f2fs_put_page(page, 1);
 396         return err;
 397 }
 398
 399 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 400                                                 struct inode *inode)
 401 {
 402         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 403         struct page *ipage;
 404         unsigned int bit_pos;
 405         f2fs_hash_t name_hash;
 406         struct f2fs_dir_entry *de;
 407         size_t namelen = name->len;
 408         struct f2fs_inline_dentry *dentry_blk = NULL;
 409         int slots = GET_DENTRY_SLOTS(namelen);
 410         struct page *page;
 411         int err = 0;
 412         int i;
 413
 414         name_hash = f2fs_dentry_hash(name);
 415
 416         ipage = get_node_page(sbi, dir->i_ino);
 417         if (IS_ERR(ipage))
 418                 return PTR_ERR(ipage);
 419
 420         dentry_blk = inline_data_addr(ipage);
 421         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 422                                                 slots, NR_INLINE_DENTRY);
 423         if (bit_pos >= NR_INLINE_DENTRY) {
 424                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 425                 if (!err)
 426                         err = -EAGAIN;
 427                 goto out;
 428         }
 429
 430         down_write(&F2FS_I(inode)->i_sem);
 431         page = init_inode_metadata(inode, dir, name, ipage);
 432         if (IS_ERR(page)) {
 433                 err = PTR_ERR(page);
 434                 goto fail;
 435         }
 436
 437         f2fs_wait_on_page_writeback(ipage, NODE);
 438         de = &dentry_blk->dentry[bit_pos];
 439         de->hash_code = name_hash;
 440         de->name_len = cpu_to_le16(namelen);
 441         memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
 442         de->ino = cpu_to_le32(inode->i_ino);
 443         set_de_type(de, inode);
 444         for (i = 0; i < slots; i++)
 445                 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
 446         set_page_dirty(ipage);
 447
 448         /* we don't need to mark_inode_dirty now */
 449         F2FS_I(inode)->i_pino = dir->i_ino;
 450         update_inode(inode, page);
 451         f2fs_put_page(page, 1);
 452
 453         update_parent_metadata(dir, inode, 0);
 454 fail:
 455         up_write(&F2FS_I(inode)->i_sem);
 456
 457         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 458                 update_inode(dir, ipage);
 459                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 460         }
 461 out:
 462         f2fs_put_page(ipage, 1);
 463         return err;
 464 }
 465
 466 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 467                                         struct inode *dir, struct inode *inode)
 468 {
 469         struct f2fs_inline_dentry *inline_dentry;
 470         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 471         unsigned int bit_pos;
 472         int i;
 473
 474         lock_page(page);
 475         f2fs_wait_on_page_writeback(page, NODE);
 476
 477         inline_dentry = inline_data_addr(page);
 478         bit_pos = dentry - inline_dentry->dentry;
 479         for (i = 0; i < slots; i++)
 480                 test_and_clear_bit_le(bit_pos + i,
 481                                 &inline_dentry->dentry_bitmap);
 482
 483         set_page_dirty(page);
 484
 485         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 486
 487         if (inode)
 488                 f2fs_drop_nlink(dir, inode, page);
 489
 490         f2fs_put_page(page, 1);
 491 }
 492
 493 bool f2fs_empty_inline_dir(struct inode *dir)
 494 {
 495         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 496         struct page *ipage;
 497         unsigned int bit_pos = 2;
 498         struct f2fs_inline_dentry *dentry_blk;
 499
 500         ipage = get_node_page(sbi, dir->i_ino);
 501         if (IS_ERR(ipage))
 502                 return false;
 503
 504         dentry_blk = inline_data_addr(ipage);
 505         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 506                                         NR_INLINE_DENTRY,
 507                                         bit_pos);
 508
 509         f2fs_put_page(ipage, 1);
 510
 511         if (bit_pos < NR_INLINE_DENTRY)
 512                 return false;
 513
 514         return true;
 515 }
 516
 517 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
 518 {
 519         struct inode *inode = file_inode(file);
 520         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 521         unsigned int bit_pos = 0;
 522         struct f2fs_inline_dentry *inline_dentry = NULL;
 523         struct f2fs_dir_entry *de = NULL;
 524         struct page *ipage = NULL;
 525         unsigned char d_type = DT_UNKNOWN;
 526
 527         if (ctx->pos == NR_INLINE_DENTRY)
 528                 return 0;
 529
 530         ipage = get_node_page(sbi, inode->i_ino);
 531         if (IS_ERR(ipage))
 532                 return PTR_ERR(ipage);
 533
 534         bit_pos = ((unsigned long)ctx->pos % NR_INLINE_DENTRY);
 535
 536         inline_dentry = inline_data_addr(ipage);
 537         while (bit_pos < NR_INLINE_DENTRY) {
 538                 bit_pos = find_next_bit_le(&inline_dentry->dentry_bitmap,
 539                                                 NR_INLINE_DENTRY,
 540                                                 bit_pos);
 541                 if (bit_pos >= NR_INLINE_DENTRY)
 542                         break;
 543
 544                 de = &inline_dentry->dentry[bit_pos];
 545                 if (de->file_type < F2FS_FT_MAX)
 546                         d_type = f2fs_filetype_table[de->file_type];
 547                 else
 548                         d_type = DT_UNKNOWN;
 549
 550                 if (!dir_emit(ctx,
 551                                 inline_dentry->filename[bit_pos],
 552                                 le16_to_cpu(de->name_len),
 553                                 le32_to_cpu(de->ino), d_type))
 554                         goto out;
 555
 556                 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 557                 ctx->pos = bit_pos;
 558         }
 559
 560         ctx->pos = NR_INLINE_DENTRY;
 561 out:
 562         f2fs_put_page(ipage, 1);
 563
 564         return 0;
 565 }