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_CACHE_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         SetPageUptodate(page);
  63 }
  64
  65 bool truncate_inline_inode(struct page *ipage, u64 from)
  66 {
  67         void *addr;
  68
  69         if (from >= MAX_INLINE_DATA)
  70                 return false;
  71
  72         addr = inline_data_addr(ipage);
  73
  74         f2fs_wait_on_page_writeback(ipage, NODE, true);
  75         memset(addr + from, 0, MAX_INLINE_DATA - from);
  76
  77         return true;
  78 }
  79
  80 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  81 {
  82         struct page *ipage;
  83
  84         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  85         if (IS_ERR(ipage)) {
  86                 unlock_page(page);
  87                 return PTR_ERR(ipage);
  88         }
  89
  90         if (!f2fs_has_inline_data(inode)) {
  91                 f2fs_put_page(ipage, 1);
  92                 return -EAGAIN;
  93         }
  94
  95         if (page->index)
  96                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  97         else
  98                 read_inline_data(page, ipage);
  99
 100         SetPageUptodate(page);
 101         f2fs_put_page(ipage, 1);
 102         unlock_page(page);
 103         return 0;
 104 }
 105
 106 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 107 {
 108         struct f2fs_io_info fio = {
 109                 .sbi = F2FS_I_SB(dn->inode),
 110                 .type = DATA,
 111                 .rw = WRITE_SYNC | REQ_PRIO,
 112                 .page = page,
 113                 .encrypted_page = NULL,
 114         };
 115         int dirty, err;
 116
 117         if (!f2fs_exist_data(dn->inode))
 118                 goto clear_out;
 119
 120         err = f2fs_reserve_block(dn, 0);
 121         if (err)
 122                 return err;
 123
 124         f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));
 125
 126         read_inline_data(page, dn->inode_page);
 127         set_page_dirty(page);
 128
 129         /* clear dirty state */
 130         dirty = clear_page_dirty_for_io(page);
 131
 132         /* write data page to try to make data consistent */
 133         set_page_writeback(page);
 134         fio.blk_addr = dn->data_blkaddr;
 135         write_data_page(dn, &fio);
 136         set_data_blkaddr(dn);
 137         f2fs_update_extent_cache(dn);
 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(F2FS_I(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         sync_inode_page(dn);
 152         f2fs_put_dnode(dn);
 153         return 0;
 154 }
 155
 156 int f2fs_convert_inline_inode(struct inode *inode)
 157 {
 158         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 159         struct dnode_of_data dn;
 160         struct page *ipage, *page;
 161         int err = 0;
 162
 163         if (!f2fs_has_inline_data(inode))
 164                 return 0;
 165
 166         page = grab_cache_page(inode->i_mapping, 0);
 167         if (!page)
 168                 return -ENOMEM;
 169
 170         f2fs_lock_op(sbi);
 171
 172         ipage = get_node_page(sbi, inode->i_ino);
 173         if (IS_ERR(ipage)) {
 174                 err = PTR_ERR(ipage);
 175                 goto out;
 176         }
 177
 178         set_new_dnode(&dn, inode, ipage, ipage, 0);
 179
 180         if (f2fs_has_inline_data(inode))
 181                 err = f2fs_convert_inline_page(&dn, page);
 182
 183         f2fs_put_dnode(&dn);
 184 out:
 185         f2fs_unlock_op(sbi);
 186
 187         f2fs_put_page(page, 1);
 188
 189         f2fs_balance_fs(sbi, dn.node_changed);
 190
 191         return err;
 192 }
 193
 194 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 195 {
 196         void *src_addr, *dst_addr;
 197         struct dnode_of_data dn;
 198         int err;
 199
 200         set_new_dnode(&dn, inode, NULL, NULL, 0);
 201         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 202         if (err)
 203                 return err;
 204
 205         if (!f2fs_has_inline_data(inode)) {
 206                 f2fs_put_dnode(&dn);
 207                 return -EAGAIN;
 208         }
 209
 210         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 211
 212         f2fs_wait_on_page_writeback(dn.inode_page, NODE, true);
 213         src_addr = kmap_atomic(page);
 214         dst_addr = inline_data_addr(dn.inode_page);
 215         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 216         kunmap_atomic(src_addr);
 217
 218         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 219         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 220
 221         sync_inode_page(&dn);
 222         clear_inline_node(dn.inode_page);
 223         f2fs_put_dnode(&dn);
 224         return 0;
 225 }
 226
 227 bool recover_inline_data(struct inode *inode, struct page *npage)
 228 {
 229         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 230         struct f2fs_inode *ri = NULL;
 231         void *src_addr, *dst_addr;
 232         struct page *ipage;
 233
 234         /*
 235          * The inline_data recovery policy is as follows.
 236          * [prev.] [next] of inline_data flag
 237          *    o       o  -> recover inline_data
 238          *    o       x  -> remove inline_data, and then recover data blocks
 239          *    x       o  -> remove inline_data, and then recover inline_data
 240          *    x       x  -> recover data blocks
 241          */
 242         if (IS_INODE(npage))
 243                 ri = F2FS_INODE(npage);
 244
 245         if (f2fs_has_inline_data(inode) &&
 246                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 247 process_inline:
 248                 ipage = get_node_page(sbi, inode->i_ino);
 249                 f2fs_bug_on(sbi, IS_ERR(ipage));
 250
 251                 f2fs_wait_on_page_writeback(ipage, NODE, true);
 252
 253                 src_addr = inline_data_addr(npage);
 254                 dst_addr = inline_data_addr(ipage);
 255                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 256
 257                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 258                 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 259
 260                 update_inode(inode, ipage);
 261                 f2fs_put_page(ipage, 1);
 262                 return true;
 263         }
 264
 265         if (f2fs_has_inline_data(inode)) {
 266                 ipage = get_node_page(sbi, inode->i_ino);
 267                 f2fs_bug_on(sbi, IS_ERR(ipage));
 268                 if (!truncate_inline_inode(ipage, 0))
 269                         return false;
 270                 f2fs_clear_inline_inode(inode);
 271                 update_inode(inode, ipage);
 272                 f2fs_put_page(ipage, 1);
 273         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 274                 if (truncate_blocks(inode, 0, false))
 275                         return false;
 276                 goto process_inline;
 277         }
 278         return false;
 279 }
 280
 281 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 282                         struct f2fs_filename *fname, struct page **res_page)
 283 {
 284         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 285         struct f2fs_inline_dentry *inline_dentry;
 286         struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 287         struct f2fs_dir_entry *de;
 288         struct f2fs_dentry_ptr d;
 289         struct page *ipage;
 290         f2fs_hash_t namehash;
 291
 292         ipage = get_node_page(sbi, dir->i_ino);
 293         if (IS_ERR(ipage))
 294                 return NULL;
 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         /*
 309          * For the most part, it should be a bug when name_len is zero.
 310          * We stop here for figuring out where the bugs has occurred.
 311          */
 312         f2fs_bug_on(sbi, d.max < 0);
 313         return de;
 314 }
 315
 316 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 317                                                         struct page **p)
 318 {
 319         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 320         struct page *ipage;
 321         struct f2fs_dir_entry *de;
 322         struct f2fs_inline_dentry *dentry_blk;
 323
 324         ipage = get_node_page(sbi, dir->i_ino);
 325         if (IS_ERR(ipage))
 326                 return NULL;
 327
 328         dentry_blk = inline_data_addr(ipage);
 329         de = &dentry_blk->dentry[1];
 330         *p = ipage;
 331         unlock_page(ipage);
 332         return de;
 333 }
 334
 335 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 336                                                         struct page *ipage)
 337 {
 338         struct f2fs_inline_dentry *dentry_blk;
 339         struct f2fs_dentry_ptr d;
 340
 341         dentry_blk = inline_data_addr(ipage);
 342
 343         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 344         do_make_empty_dir(inode, parent, &d);
 345
 346         set_page_dirty(ipage);
 347
 348         /* update i_size to MAX_INLINE_DATA */
 349         if (i_size_read(inode) < MAX_INLINE_DATA) {
 350                 i_size_write(inode, MAX_INLINE_DATA);
 351                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 352         }
 353         return 0;
 354 }
 355
 356 /*
 357  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
 358  * release ipage in this function.
 359  */
 360 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 361                                 struct f2fs_inline_dentry *inline_dentry)
 362 {
 363         struct page *page;
 364         struct dnode_of_data dn;
 365         struct f2fs_dentry_block *dentry_blk;
 366         int err;
 367
 368         page = grab_cache_page(dir->i_mapping, 0);
 369         if (!page) {
 370                 f2fs_put_page(ipage, 1);
 371                 return -ENOMEM;
 372         }
 373
 374         set_new_dnode(&dn, dir, ipage, NULL, 0);
 375         err = f2fs_reserve_block(&dn, 0);
 376         if (err)
 377                 goto out;
 378
 379         f2fs_wait_on_page_writeback(page, DATA, true);
 380         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 381
 382         dentry_blk = kmap_atomic(page);
 383
 384         /* copy data from inline dentry block to new dentry block */
 385         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 386                                         INLINE_DENTRY_BITMAP_SIZE);
 387         memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
 388                         SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
 389         /*
 390          * we do not need to zero out remainder part of dentry and filename
 391          * field, since we have used bitmap for marking the usage status of
 392          * them, besides, we can also ignore copying/zeroing reserved space
 393          * of dentry block, because them haven't been used so far.
 394          */
 395         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 396                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 397         memcpy(dentry_blk->filename, inline_dentry->filename,
 398                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 399
 400         kunmap_atomic(dentry_blk);
 401         SetPageUptodate(page);
 402         set_page_dirty(page);
 403
 404         /* clear inline dir and flag after data writeback */
 405         truncate_inline_inode(ipage, 0);
 406
 407         stat_dec_inline_dir(dir);
 408         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 409
 410         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 411                 i_size_write(dir, PAGE_CACHE_SIZE);
 412                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 413         }
 414
 415         sync_inode_page(&dn);
 416 out:
 417         f2fs_put_page(page, 1);
 418         return err;
 419 }
 420
 421 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 422                         struct inode *inode, nid_t ino, umode_t mode)
 423 {
 424         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 425         struct page *ipage;
 426         unsigned int bit_pos;
 427         f2fs_hash_t name_hash;
 428         size_t namelen = name->len;
 429         struct f2fs_inline_dentry *dentry_blk = NULL;
 430         struct f2fs_dentry_ptr d;
 431         int slots = GET_DENTRY_SLOTS(namelen);
 432         struct page *page = NULL;
 433         int err = 0;
 434
 435         ipage = get_node_page(sbi, dir->i_ino);
 436         if (IS_ERR(ipage))
 437                 return PTR_ERR(ipage);
 438
 439         dentry_blk = inline_data_addr(ipage);
 440         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 441                                                 slots, NR_INLINE_DENTRY);
 442         if (bit_pos >= NR_INLINE_DENTRY) {
 443                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 444                 if (err)
 445                         return err;
 446                 err = -EAGAIN;
 447                 goto out;
 448         }
 449
 450         if (inode) {
 451                 down_write(&F2FS_I(inode)->i_sem);
 452                 page = init_inode_metadata(inode, dir, name, ipage);
 453                 if (IS_ERR(page)) {
 454                         err = PTR_ERR(page);
 455                         goto fail;
 456                 }
 457         }
 458
 459         f2fs_wait_on_page_writeback(ipage, NODE, true);
 460
 461         name_hash = f2fs_dentry_hash(name);
 462         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 463         f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 464
 465         set_page_dirty(ipage);
 466
 467         /* we don't need to mark_inode_dirty now */
 468         if (inode) {
 469                 F2FS_I(inode)->i_pino = dir->i_ino;
 470                 update_inode(inode, page);
 471                 f2fs_put_page(page, 1);
 472         }
 473
 474         update_parent_metadata(dir, inode, 0);
 475 fail:
 476         if (inode)
 477                 up_write(&F2FS_I(inode)->i_sem);
 478
 479         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 480                 update_inode(dir, ipage);
 481                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 482         }
 483 out:
 484         f2fs_put_page(ipage, 1);
 485         return err;
 486 }
 487
 488 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 489                                         struct inode *dir, struct inode *inode)
 490 {
 491         struct f2fs_inline_dentry *inline_dentry;
 492         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 493         unsigned int bit_pos;
 494         int i;
 495
 496         lock_page(page);
 497         f2fs_wait_on_page_writeback(page, NODE, true);
 498
 499         inline_dentry = inline_data_addr(page);
 500         bit_pos = dentry - inline_dentry->dentry;
 501         for (i = 0; i < slots; i++)
 502                 test_and_clear_bit_le(bit_pos + i,
 503                                 &inline_dentry->dentry_bitmap);
 504
 505         set_page_dirty(page);
 506
 507         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 508
 509         if (inode)
 510                 f2fs_drop_nlink(dir, inode, page);
 511
 512         f2fs_put_page(page, 1);
 513 }
 514
 515 bool f2fs_empty_inline_dir(struct inode *dir)
 516 {
 517         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 518         struct page *ipage;
 519         unsigned int bit_pos = 2;
 520         struct f2fs_inline_dentry *dentry_blk;
 521
 522         ipage = get_node_page(sbi, dir->i_ino);
 523         if (IS_ERR(ipage))
 524                 return false;
 525
 526         dentry_blk = inline_data_addr(ipage);
 527         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 528                                         NR_INLINE_DENTRY,
 529                                         bit_pos);
 530
 531         f2fs_put_page(ipage, 1);
 532
 533         if (bit_pos < NR_INLINE_DENTRY)
 534                 return false;
 535
 536         return true;
 537 }
 538
 539 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 540                                 struct f2fs_str *fstr)
 541 {
 542         struct inode *inode = file_inode(file);
 543         struct f2fs_inline_dentry *inline_dentry = NULL;
 544         struct page *ipage = NULL;
 545         struct f2fs_dentry_ptr d;
 546
 547         if (ctx->pos == NR_INLINE_DENTRY)
 548                 return 0;
 549
 550         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 551         if (IS_ERR(ipage))
 552                 return PTR_ERR(ipage);
 553
 554         inline_dentry = inline_data_addr(ipage);
 555
 556         make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);
 557
 558         if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
 559                 ctx->pos = NR_INLINE_DENTRY;
 560
 561         f2fs_put_page(ipage, 1);
 562         return 0;
 563 }
 564
 565 int f2fs_inline_data_fiemap(struct inode *inode,
 566                 struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
 567 {
 568         __u64 byteaddr, ilen;
 569         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
 570                 FIEMAP_EXTENT_LAST;
 571         struct node_info ni;
 572         struct page *ipage;
 573         int err = 0;
 574
 575         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 576         if (IS_ERR(ipage))
 577                 return PTR_ERR(ipage);
 578
 579         if (!f2fs_has_inline_data(inode)) {
 580                 err = -EAGAIN;
 581                 goto out;
 582         }
 583
 584         ilen = min_t(size_t, MAX_INLINE_DATA, i_size_read(inode));
 585         if (start >= ilen)
 586                 goto out;
 587         if (start + len < ilen)
 588                 ilen = start + len;
 589         ilen -= start;
 590
 591         get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
 592         byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
 593         byteaddr += (char *)inline_data_addr(ipage) - (char *)F2FS_INODE(ipage);
 594         err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
 595 out:
 596         f2fs_put_page(ipage, 1);
 597         return err;
 598 }