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_data(struct inode *inode)
  17 {
  18         if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
  19                 return false;
  20
  21         if (f2fs_is_atomic_file(inode))
  22                 return false;
  23
  24         if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
  25                 return false;
  26
  27         if (i_size_read(inode) > MAX_INLINE_DATA)
  28                 return false;
  29
  30         if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
  31                 return false;
  32
  33         return true;
  34 }
  35
  36 bool f2fs_may_inline_dentry(struct inode *inode)
  37 {
  38         if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
  39                 return false;
  40
  41         if (!S_ISDIR(inode->i_mode))
  42                 return false;
  43
  44         return true;
  45 }
  46
  47 void read_inline_data(struct page *page, struct page *ipage)
  48 {
  49         void *src_addr, *dst_addr;
  50
  51         if (PageUptodate(page))
  52                 return;
  53
  54         f2fs_bug_on(F2FS_P_SB(page), page->index);
  55
  56         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
  57
  58         /* Copy the whole inline data block */
  59         src_addr = inline_data_addr(ipage);
  60         dst_addr = kmap_atomic(page);
  61         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  62         flush_dcache_page(page);
  63         kunmap_atomic(dst_addr);
  64         SetPageUptodate(page);
  65 }
  66
  67 bool truncate_inline_inode(struct page *ipage, u64 from)
  68 {
  69         void *addr;
  70
  71         if (from >= MAX_INLINE_DATA)
  72                 return false;
  73
  74         addr = inline_data_addr(ipage);
  75
  76         f2fs_wait_on_page_writeback(ipage, NODE);
  77         memset(addr + from, 0, MAX_INLINE_DATA - from);
  78
  79         return true;
  80 }
  81
  82 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  83 {
  84         struct page *ipage;
  85
  86         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  87         if (IS_ERR(ipage)) {
  88                 unlock_page(page);
  89                 return PTR_ERR(ipage);
  90         }
  91
  92         if (!f2fs_has_inline_data(inode)) {
  93                 f2fs_put_page(ipage, 1);
  94                 return -EAGAIN;
  95         }
  96
  97         if (page->index)
  98                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  99         else
 100                 read_inline_data(page, ipage);
 101
 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         void *src_addr, *dst_addr;
 111         struct f2fs_io_info fio = {
 112                 .sbi = F2FS_I_SB(dn->inode),
 113                 .type = DATA,
 114                 .rw = WRITE_SYNC | REQ_PRIO,
 115                 .page = page,
 116                 .encrypted_page = NULL,
 117         };
 118         int dirty, err;
 119
 120         f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
 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_wait_on_page_writeback(page, DATA);
 130
 131         if (PageUptodate(page))
 132                 goto no_update;
 133
 134         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 135
 136         /* Copy the whole inline data block */
 137         src_addr = inline_data_addr(dn->inode_page);
 138         dst_addr = kmap_atomic(page);
 139         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 140         flush_dcache_page(page);
 141         kunmap_atomic(dst_addr);
 142         SetPageUptodate(page);
 143 no_update:
 144         set_page_dirty(page);
 145
 146         /* clear dirty state */
 147         dirty = clear_page_dirty_for_io(page);
 148
 149         /* write data page to try to make data consistent */
 150         set_page_writeback(page);
 151         fio.blk_addr = dn->data_blkaddr;
 152         write_data_page(dn, &fio);
 153         set_data_blkaddr(dn);
 154         f2fs_update_extent_cache(dn);
 155         f2fs_wait_on_page_writeback(page, DATA);
 156         if (dirty)
 157                 inode_dec_dirty_pages(dn->inode);
 158
 159         /* this converted inline_data should be recovered. */
 160         set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);
 161
 162         /* clear inline data and flag after data writeback */
 163         truncate_inline_inode(dn->inode_page, 0);
 164 clear_out:
 165         stat_dec_inline_inode(dn->inode);
 166         f2fs_clear_inline_inode(dn->inode);
 167         sync_inode_page(dn);
 168         f2fs_put_dnode(dn);
 169         return 0;
 170 }
 171
 172 int f2fs_convert_inline_inode(struct inode *inode)
 173 {
 174         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 175         struct dnode_of_data dn;
 176         struct page *ipage, *page;
 177         int err = 0;
 178
 179         page = grab_cache_page(inode->i_mapping, 0);
 180         if (!page)
 181                 return -ENOMEM;
 182
 183         f2fs_lock_op(sbi);
 184
 185         ipage = get_node_page(sbi, inode->i_ino);
 186         if (IS_ERR(ipage)) {
 187                 err = PTR_ERR(ipage);
 188                 goto out;
 189         }
 190
 191         set_new_dnode(&dn, inode, ipage, ipage, 0);
 192
 193         if (f2fs_has_inline_data(inode))
 194                 err = f2fs_convert_inline_page(&dn, page);
 195
 196         f2fs_put_dnode(&dn);
 197 out:
 198         f2fs_unlock_op(sbi);
 199
 200         f2fs_put_page(page, 1);
 201         return err;
 202 }
 203
 204 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 205 {
 206         void *src_addr, *dst_addr;
 207         struct dnode_of_data dn;
 208         int err;
 209
 210         set_new_dnode(&dn, inode, NULL, NULL, 0);
 211         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 212         if (err)
 213                 return err;
 214
 215         if (!f2fs_has_inline_data(inode)) {
 216                 f2fs_put_dnode(&dn);
 217                 return -EAGAIN;
 218         }
 219
 220         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 221
 222         f2fs_wait_on_page_writeback(dn.inode_page, NODE);
 223         src_addr = kmap_atomic(page);
 224         dst_addr = inline_data_addr(dn.inode_page);
 225         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 226         kunmap_atomic(src_addr);
 227
 228         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 229         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 230
 231         sync_inode_page(&dn);
 232         f2fs_put_dnode(&dn);
 233         return 0;
 234 }
 235
 236 bool recover_inline_data(struct inode *inode, struct page *npage)
 237 {
 238         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 239         struct f2fs_inode *ri = NULL;
 240         void *src_addr, *dst_addr;
 241         struct page *ipage;
 242
 243         /*
 244          * The inline_data recovery policy is as follows.
 245          * [prev.] [next] of inline_data flag
 246          *    o       o  -> recover inline_data
 247          *    o       x  -> remove inline_data, and then recover data blocks
 248          *    x       o  -> remove inline_data, and then recover inline_data
 249          *    x       x  -> recover data blocks
 250          */
 251         if (IS_INODE(npage))
 252                 ri = F2FS_INODE(npage);
 253
 254         if (f2fs_has_inline_data(inode) &&
 255                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 256 process_inline:
 257                 ipage = get_node_page(sbi, inode->i_ino);
 258                 f2fs_bug_on(sbi, IS_ERR(ipage));
 259
 260                 f2fs_wait_on_page_writeback(ipage, NODE);
 261
 262                 src_addr = inline_data_addr(npage);
 263                 dst_addr = inline_data_addr(ipage);
 264                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 265
 266                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 267                 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 268
 269                 update_inode(inode, ipage);
 270                 f2fs_put_page(ipage, 1);
 271                 return true;
 272         }
 273
 274         if (f2fs_has_inline_data(inode)) {
 275                 ipage = get_node_page(sbi, inode->i_ino);
 276                 f2fs_bug_on(sbi, IS_ERR(ipage));
 277                 truncate_inline_inode(ipage, 0);
 278                 f2fs_clear_inline_inode(inode);
 279                 update_inode(inode, ipage);
 280                 f2fs_put_page(ipage, 1);
 281         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 282                 truncate_blocks(inode, 0, false);
 283                 goto process_inline;
 284         }
 285         return false;
 286 }
 287
 288 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 289                         struct f2fs_filename *fname, struct page **res_page)
 290 {
 291         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 292         struct f2fs_inline_dentry *inline_dentry;
 293         struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 294         struct f2fs_dir_entry *de;
 295         struct f2fs_dentry_ptr d;
 296         struct page *ipage;
 297         f2fs_hash_t namehash;
 298
 299         ipage = get_node_page(sbi, dir->i_ino);
 300         if (IS_ERR(ipage))
 301                 return NULL;
 302
 303         namehash = f2fs_dentry_hash(&name);
 304
 305         inline_dentry = inline_data_addr(ipage);
 306
 307         make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
 308         de = find_target_dentry(fname, namehash, NULL, &d);
 309         unlock_page(ipage);
 310         if (de)
 311                 *res_page = ipage;
 312         else
 313                 f2fs_put_page(ipage, 0);
 314
 315         /*
 316          * For the most part, it should be a bug when name_len is zero.
 317          * We stop here for figuring out where the bugs has occurred.
 318          */
 319         f2fs_bug_on(sbi, d.max < 0);
 320         return de;
 321 }
 322
 323 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 324                                                         struct page **p)
 325 {
 326         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 327         struct page *ipage;
 328         struct f2fs_dir_entry *de;
 329         struct f2fs_inline_dentry *dentry_blk;
 330
 331         ipage = get_node_page(sbi, dir->i_ino);
 332         if (IS_ERR(ipage))
 333                 return NULL;
 334
 335         dentry_blk = inline_data_addr(ipage);
 336         de = &dentry_blk->dentry[1];
 337         *p = ipage;
 338         unlock_page(ipage);
 339         return de;
 340 }
 341
 342 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 343                                                         struct page *ipage)
 344 {
 345         struct f2fs_inline_dentry *dentry_blk;
 346         struct f2fs_dentry_ptr d;
 347
 348         dentry_blk = inline_data_addr(ipage);
 349
 350         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 351         do_make_empty_dir(inode, parent, &d);
 352
 353         set_page_dirty(ipage);
 354
 355         /* update i_size to MAX_INLINE_DATA */
 356         if (i_size_read(inode) < MAX_INLINE_DATA) {
 357                 i_size_write(inode, MAX_INLINE_DATA);
 358                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 359         }
 360         return 0;
 361 }
 362
 363 /*
 364  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
 365  * release ipage in this function.
 366  */
 367 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 368                                 struct f2fs_inline_dentry *inline_dentry)
 369 {
 370         struct page *page;
 371         struct dnode_of_data dn;
 372         struct f2fs_dentry_block *dentry_blk;
 373         int err;
 374
 375         page = grab_cache_page(dir->i_mapping, 0);
 376         if (!page) {
 377                 f2fs_put_page(ipage, 1);
 378                 return -ENOMEM;
 379         }
 380
 381         set_new_dnode(&dn, dir, ipage, NULL, 0);
 382         err = f2fs_reserve_block(&dn, 0);
 383         if (err)
 384                 goto out;
 385
 386         f2fs_wait_on_page_writeback(page, DATA);
 387         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 388
 389         dentry_blk = kmap_atomic(page);
 390
 391         /* copy data from inline dentry block to new dentry block */
 392         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 393                                         INLINE_DENTRY_BITMAP_SIZE);
 394         memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
 395                         SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
 396         /*
 397          * we do not need to zero out remainder part of dentry and filename
 398          * field, since we have used bitmap for marking the usage status of
 399          * them, besides, we can also ignore copying/zeroing reserved space
 400          * of dentry block, because them haven't been used so far.
 401          */
 402         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 403                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 404         memcpy(dentry_blk->filename, inline_dentry->filename,
 405                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 406
 407         kunmap_atomic(dentry_blk);
 408         SetPageUptodate(page);
 409         set_page_dirty(page);
 410
 411         /* clear inline dir and flag after data writeback */
 412         truncate_inline_inode(ipage, 0);
 413
 414         stat_dec_inline_dir(dir);
 415         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 416
 417         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 418                 i_size_write(dir, PAGE_CACHE_SIZE);
 419                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 420         }
 421
 422         sync_inode_page(&dn);
 423 out:
 424         f2fs_put_page(page, 1);
 425         return err;
 426 }
 427
 428 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 429                         struct inode *inode, nid_t ino, umode_t mode)
 430 {
 431         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 432         struct page *ipage;
 433         unsigned int bit_pos;
 434         f2fs_hash_t name_hash;
 435         size_t namelen = name->len;
 436         struct f2fs_inline_dentry *dentry_blk = NULL;
 437         struct f2fs_dentry_ptr d;
 438         int slots = GET_DENTRY_SLOTS(namelen);
 439         struct page *page = NULL;
 440         int err = 0;
 441
 442         ipage = get_node_page(sbi, dir->i_ino);
 443         if (IS_ERR(ipage))
 444                 return PTR_ERR(ipage);
 445
 446         dentry_blk = inline_data_addr(ipage);
 447         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 448                                                 slots, NR_INLINE_DENTRY);
 449         if (bit_pos >= NR_INLINE_DENTRY) {
 450                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 451                 if (err)
 452                         return err;
 453                 err = -EAGAIN;
 454                 goto out;
 455         }
 456
 457         if (inode) {
 458                 down_write(&F2FS_I(inode)->i_sem);
 459                 page = init_inode_metadata(inode, dir, name, ipage);
 460                 if (IS_ERR(page)) {
 461                         err = PTR_ERR(page);
 462                         goto fail;
 463                 }
 464         }
 465
 466         f2fs_wait_on_page_writeback(ipage, NODE);
 467
 468         name_hash = f2fs_dentry_hash(name);
 469         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 470         f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 471
 472         set_page_dirty(ipage);
 473
 474         /* we don't need to mark_inode_dirty now */
 475         if (inode) {
 476                 F2FS_I(inode)->i_pino = dir->i_ino;
 477                 update_inode(inode, page);
 478                 f2fs_put_page(page, 1);
 479         }
 480
 481         update_parent_metadata(dir, inode, 0);
 482 fail:
 483         if (inode)
 484                 up_write(&F2FS_I(inode)->i_sem);
 485
 486         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 487                 update_inode(dir, ipage);
 488                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 489         }
 490 out:
 491         f2fs_put_page(ipage, 1);
 492         return err;
 493 }
 494
 495 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 496                                         struct inode *dir, struct inode *inode)
 497 {
 498         struct f2fs_inline_dentry *inline_dentry;
 499         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 500         unsigned int bit_pos;
 501         int i;
 502
 503         lock_page(page);
 504         f2fs_wait_on_page_writeback(page, NODE);
 505
 506         inline_dentry = inline_data_addr(page);
 507         bit_pos = dentry - inline_dentry->dentry;
 508         for (i = 0; i < slots; i++)
 509                 test_and_clear_bit_le(bit_pos + i,
 510                                 &inline_dentry->dentry_bitmap);
 511
 512         set_page_dirty(page);
 513
 514         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 515
 516         if (inode)
 517                 f2fs_drop_nlink(dir, inode, page);
 518
 519         f2fs_put_page(page, 1);
 520 }
 521
 522 bool f2fs_empty_inline_dir(struct inode *dir)
 523 {
 524         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 525         struct page *ipage;
 526         unsigned int bit_pos = 2;
 527         struct f2fs_inline_dentry *dentry_blk;
 528
 529         ipage = get_node_page(sbi, dir->i_ino);
 530         if (IS_ERR(ipage))
 531                 return false;
 532
 533         dentry_blk = inline_data_addr(ipage);
 534         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 535                                         NR_INLINE_DENTRY,
 536                                         bit_pos);
 537
 538         f2fs_put_page(ipage, 1);
 539
 540         if (bit_pos < NR_INLINE_DENTRY)
 541                 return false;
 542
 543         return true;
 544 }
 545
 546 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 547                                 struct f2fs_str *fstr)
 548 {
 549         struct inode *inode = file_inode(file);
 550         struct f2fs_inline_dentry *inline_dentry = NULL;
 551         struct page *ipage = NULL;
 552         struct f2fs_dentry_ptr d;
 553
 554         if (ctx->pos == NR_INLINE_DENTRY)
 555                 return 0;
 556
 557         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 558         if (IS_ERR(ipage))
 559                 return PTR_ERR(ipage);
 560
 561         inline_dentry = inline_data_addr(ipage);
 562
 563         make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);
 564
 565         if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
 566                 ctx->pos = NR_INLINE_DENTRY;
 567
 568         f2fs_put_page(ipage, 1);
 569         return 0;
 570 }