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);
  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         void *src_addr, *dst_addr;
 109         struct f2fs_io_info fio = {
 110                 .sbi = F2FS_I_SB(dn->inode),
 111                 .type = DATA,
 112                 .rw = WRITE_SYNC | REQ_PRIO,
 113                 .page = page,
 114                 .encrypted_page = NULL,
 115         };
 116         int dirty, err;
 117
 118         f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
 119
 120         if (!f2fs_exist_data(dn->inode))
 121                 goto clear_out;
 122
 123         err = f2fs_reserve_block(dn, 0);
 124         if (err)
 125                 return err;
 126
 127         f2fs_wait_on_page_writeback(page, DATA);
 128
 129         if (PageUptodate(page))
 130                 goto no_update;
 131
 132         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 133
 134         /* Copy the whole inline data block */
 135         src_addr = inline_data_addr(dn->inode_page);
 136         dst_addr = kmap_atomic(page);
 137         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 138         flush_dcache_page(page);
 139         kunmap_atomic(dst_addr);
 140         SetPageUptodate(page);
 141 no_update:
 142         set_page_dirty(page);
 143
 144         /* clear dirty state */
 145         dirty = clear_page_dirty_for_io(page);
 146
 147         /* write data page to try to make data consistent */
 148         set_page_writeback(page);
 149         fio.blk_addr = dn->data_blkaddr;
 150         write_data_page(dn, &fio);
 151         set_data_blkaddr(dn);
 152         f2fs_update_extent_cache(dn);
 153         f2fs_wait_on_page_writeback(page, DATA);
 154         if (dirty)
 155                 inode_dec_dirty_pages(dn->inode);
 156
 157         /* this converted inline_data should be recovered. */
 158         set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);
 159
 160         /* clear inline data and flag after data writeback */
 161         truncate_inline_inode(dn->inode_page, 0);
 162 clear_out:
 163         stat_dec_inline_inode(dn->inode);
 164         f2fs_clear_inline_inode(dn->inode);
 165         sync_inode_page(dn);
 166         f2fs_put_dnode(dn);
 167         return 0;
 168 }
 169
 170 int f2fs_convert_inline_inode(struct inode *inode)
 171 {
 172         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 173         struct dnode_of_data dn;
 174         struct page *ipage, *page;
 175         int err = 0;
 176
 177         if (!f2fs_has_inline_data(inode))
 178                 return 0;
 179
 180         page = grab_cache_page(inode->i_mapping, 0);
 181         if (!page)
 182                 return -ENOMEM;
 183
 184         f2fs_lock_op(sbi);
 185
 186         ipage = get_node_page(sbi, inode->i_ino);
 187         if (IS_ERR(ipage)) {
 188                 err = PTR_ERR(ipage);
 189                 goto out;
 190         }
 191
 192         set_new_dnode(&dn, inode, ipage, ipage, 0);
 193
 194         if (f2fs_has_inline_data(inode))
 195                 err = f2fs_convert_inline_page(&dn, page);
 196
 197         f2fs_put_dnode(&dn);
 198 out:
 199         f2fs_unlock_op(sbi);
 200
 201         f2fs_put_page(page, 1);
 202
 203         f2fs_balance_fs(sbi, dn.node_changed);
 204
 205         return err;
 206 }
 207
 208 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 209 {
 210         void *src_addr, *dst_addr;
 211         struct dnode_of_data dn;
 212         int err;
 213
 214         set_new_dnode(&dn, inode, NULL, NULL, 0);
 215         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 216         if (err)
 217                 return err;
 218
 219         if (!f2fs_has_inline_data(inode)) {
 220                 f2fs_put_dnode(&dn);
 221                 return -EAGAIN;
 222         }
 223
 224         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 225
 226         f2fs_wait_on_page_writeback(dn.inode_page, NODE);
 227         src_addr = kmap_atomic(page);
 228         dst_addr = inline_data_addr(dn.inode_page);
 229         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 230         kunmap_atomic(src_addr);
 231
 232         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 233         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 234
 235         sync_inode_page(&dn);
 236         f2fs_put_dnode(&dn);
 237         return 0;
 238 }
 239
 240 bool recover_inline_data(struct inode *inode, struct page *npage)
 241 {
 242         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 243         struct f2fs_inode *ri = NULL;
 244         void *src_addr, *dst_addr;
 245         struct page *ipage;
 246
 247         /*
 248          * The inline_data recovery policy is as follows.
 249          * [prev.] [next] of inline_data flag
 250          *    o       o  -> recover inline_data
 251          *    o       x  -> remove inline_data, and then recover data blocks
 252          *    x       o  -> remove inline_data, and then recover inline_data
 253          *    x       x  -> recover data blocks
 254          */
 255         if (IS_INODE(npage))
 256                 ri = F2FS_INODE(npage);
 257
 258         if (f2fs_has_inline_data(inode) &&
 259                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 260 process_inline:
 261                 ipage = get_node_page(sbi, inode->i_ino);
 262                 f2fs_bug_on(sbi, IS_ERR(ipage));
 263
 264                 f2fs_wait_on_page_writeback(ipage, NODE);
 265
 266                 src_addr = inline_data_addr(npage);
 267                 dst_addr = inline_data_addr(ipage);
 268                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 269
 270                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 271                 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 272
 273                 update_inode(inode, ipage);
 274                 f2fs_put_page(ipage, 1);
 275                 return true;
 276         }
 277
 278         if (f2fs_has_inline_data(inode)) {
 279                 ipage = get_node_page(sbi, inode->i_ino);
 280                 f2fs_bug_on(sbi, IS_ERR(ipage));
 281                 if (!truncate_inline_inode(ipage, 0))
 282                         return false;
 283                 f2fs_clear_inline_inode(inode);
 284                 update_inode(inode, ipage);
 285                 f2fs_put_page(ipage, 1);
 286         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 287                 if (truncate_blocks(inode, 0, false))
 288                         return false;
 289                 goto process_inline;
 290         }
 291         return false;
 292 }
 293
 294 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 295                         struct f2fs_filename *fname, struct page **res_page)
 296 {
 297         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 298         struct f2fs_inline_dentry *inline_dentry;
 299         struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 300         struct f2fs_dir_entry *de;
 301         struct f2fs_dentry_ptr d;
 302         struct page *ipage;
 303         f2fs_hash_t namehash;
 304
 305         ipage = get_node_page(sbi, dir->i_ino);
 306         if (IS_ERR(ipage))
 307                 return NULL;
 308
 309         namehash = f2fs_dentry_hash(&name);
 310
 311         inline_dentry = inline_data_addr(ipage);
 312
 313         make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
 314         de = find_target_dentry(fname, namehash, NULL, &d);
 315         unlock_page(ipage);
 316         if (de)
 317                 *res_page = ipage;
 318         else
 319                 f2fs_put_page(ipage, 0);
 320
 321         /*
 322          * For the most part, it should be a bug when name_len is zero.
 323          * We stop here for figuring out where the bugs has occurred.
 324          */
 325         f2fs_bug_on(sbi, d.max < 0);
 326         return de;
 327 }
 328
 329 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 330                                                         struct page **p)
 331 {
 332         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 333         struct page *ipage;
 334         struct f2fs_dir_entry *de;
 335         struct f2fs_inline_dentry *dentry_blk;
 336
 337         ipage = get_node_page(sbi, dir->i_ino);
 338         if (IS_ERR(ipage))
 339                 return NULL;
 340
 341         dentry_blk = inline_data_addr(ipage);
 342         de = &dentry_blk->dentry[1];
 343         *p = ipage;
 344         unlock_page(ipage);
 345         return de;
 346 }
 347
 348 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 349                                                         struct page *ipage)
 350 {
 351         struct f2fs_inline_dentry *dentry_blk;
 352         struct f2fs_dentry_ptr d;
 353
 354         dentry_blk = inline_data_addr(ipage);
 355
 356         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 357         do_make_empty_dir(inode, parent, &d);
 358
 359         set_page_dirty(ipage);
 360
 361         /* update i_size to MAX_INLINE_DATA */
 362         if (i_size_read(inode) < MAX_INLINE_DATA) {
 363                 i_size_write(inode, MAX_INLINE_DATA);
 364                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 365         }
 366         return 0;
 367 }
 368
 369 /*
 370  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
 371  * release ipage in this function.
 372  */
 373 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 374                                 struct f2fs_inline_dentry *inline_dentry)
 375 {
 376         struct page *page;
 377         struct dnode_of_data dn;
 378         struct f2fs_dentry_block *dentry_blk;
 379         int err;
 380
 381         page = grab_cache_page(dir->i_mapping, 0);
 382         if (!page) {
 383                 f2fs_put_page(ipage, 1);
 384                 return -ENOMEM;
 385         }
 386
 387         set_new_dnode(&dn, dir, ipage, NULL, 0);
 388         err = f2fs_reserve_block(&dn, 0);
 389         if (err)
 390                 goto out;
 391
 392         f2fs_wait_on_page_writeback(page, DATA);
 393         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 394
 395         dentry_blk = kmap_atomic(page);
 396
 397         /* copy data from inline dentry block to new dentry block */
 398         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 399                                         INLINE_DENTRY_BITMAP_SIZE);
 400         memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
 401                         SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
 402         /*
 403          * we do not need to zero out remainder part of dentry and filename
 404          * field, since we have used bitmap for marking the usage status of
 405          * them, besides, we can also ignore copying/zeroing reserved space
 406          * of dentry block, because them haven't been used so far.
 407          */
 408         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 409                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 410         memcpy(dentry_blk->filename, inline_dentry->filename,
 411                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 412
 413         kunmap_atomic(dentry_blk);
 414         SetPageUptodate(page);
 415         set_page_dirty(page);
 416
 417         /* clear inline dir and flag after data writeback */
 418         truncate_inline_inode(ipage, 0);
 419
 420         stat_dec_inline_dir(dir);
 421         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 422
 423         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 424                 i_size_write(dir, PAGE_CACHE_SIZE);
 425                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 426         }
 427
 428         sync_inode_page(&dn);
 429 out:
 430         f2fs_put_page(page, 1);
 431         return err;
 432 }
 433
 434 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 435                         struct inode *inode, nid_t ino, umode_t mode)
 436 {
 437         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 438         struct page *ipage;
 439         unsigned int bit_pos;
 440         f2fs_hash_t name_hash;
 441         size_t namelen = name->len;
 442         struct f2fs_inline_dentry *dentry_blk = NULL;
 443         struct f2fs_dentry_ptr d;
 444         int slots = GET_DENTRY_SLOTS(namelen);
 445         struct page *page = NULL;
 446         int err = 0;
 447
 448         ipage = get_node_page(sbi, dir->i_ino);
 449         if (IS_ERR(ipage))
 450                 return PTR_ERR(ipage);
 451
 452         dentry_blk = inline_data_addr(ipage);
 453         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 454                                                 slots, NR_INLINE_DENTRY);
 455         if (bit_pos >= NR_INLINE_DENTRY) {
 456                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 457                 if (err)
 458                         return err;
 459                 err = -EAGAIN;
 460                 goto out;
 461         }
 462
 463         if (inode) {
 464                 down_write(&F2FS_I(inode)->i_sem);
 465                 page = init_inode_metadata(inode, dir, name, ipage);
 466                 if (IS_ERR(page)) {
 467                         err = PTR_ERR(page);
 468                         goto fail;
 469                 }
 470         }
 471
 472         f2fs_wait_on_page_writeback(ipage, NODE);
 473
 474         name_hash = f2fs_dentry_hash(name);
 475         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 476         f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 477
 478         set_page_dirty(ipage);
 479
 480         /* we don't need to mark_inode_dirty now */
 481         if (inode) {
 482                 F2FS_I(inode)->i_pino = dir->i_ino;
 483                 update_inode(inode, page);
 484                 f2fs_put_page(page, 1);
 485         }
 486
 487         update_parent_metadata(dir, inode, 0);
 488 fail:
 489         if (inode)
 490                 up_write(&F2FS_I(inode)->i_sem);
 491
 492         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 493                 update_inode(dir, ipage);
 494                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 495         }
 496 out:
 497         f2fs_put_page(ipage, 1);
 498         return err;
 499 }
 500
 501 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 502                                         struct inode *dir, struct inode *inode)
 503 {
 504         struct f2fs_inline_dentry *inline_dentry;
 505         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 506         unsigned int bit_pos;
 507         int i;
 508
 509         lock_page(page);
 510         f2fs_wait_on_page_writeback(page, NODE);
 511
 512         inline_dentry = inline_data_addr(page);
 513         bit_pos = dentry - inline_dentry->dentry;
 514         for (i = 0; i < slots; i++)
 515                 test_and_clear_bit_le(bit_pos + i,
 516                                 &inline_dentry->dentry_bitmap);
 517
 518         set_page_dirty(page);
 519
 520         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 521
 522         if (inode)
 523                 f2fs_drop_nlink(dir, inode, page);
 524
 525         f2fs_put_page(page, 1);
 526 }
 527
 528 bool f2fs_empty_inline_dir(struct inode *dir)
 529 {
 530         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 531         struct page *ipage;
 532         unsigned int bit_pos = 2;
 533         struct f2fs_inline_dentry *dentry_blk;
 534
 535         ipage = get_node_page(sbi, dir->i_ino);
 536         if (IS_ERR(ipage))
 537                 return false;
 538
 539         dentry_blk = inline_data_addr(ipage);
 540         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 541                                         NR_INLINE_DENTRY,
 542                                         bit_pos);
 543
 544         f2fs_put_page(ipage, 1);
 545
 546         if (bit_pos < NR_INLINE_DENTRY)
 547                 return false;
 548
 549         return true;
 550 }
 551
 552 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 553                                 struct f2fs_str *fstr)
 554 {
 555         struct inode *inode = file_inode(file);
 556         struct f2fs_inline_dentry *inline_dentry = NULL;
 557         struct page *ipage = NULL;
 558         struct f2fs_dentry_ptr d;
 559
 560         if (ctx->pos == NR_INLINE_DENTRY)
 561                 return 0;
 562
 563         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 564         if (IS_ERR(ipage))
 565                 return PTR_ERR(ipage);
 566
 567         inline_dentry = inline_data_addr(ipage);
 568
 569         make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);
 570
 571         if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
 572                 ctx->pos = NR_INLINE_DENTRY;
 573
 574         f2fs_put_page(ipage, 1);
 575         return 0;
 576 }
 577
 578 int f2fs_inline_data_fiemap(struct inode *inode,
 579                 struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
 580 {
 581         __u64 byteaddr, ilen;
 582         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
 583                 FIEMAP_EXTENT_LAST;
 584         struct node_info ni;
 585         struct page *ipage;
 586         int err = 0;
 587
 588         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 589         if (IS_ERR(ipage))
 590                 return PTR_ERR(ipage);
 591
 592         if (!f2fs_has_inline_data(inode)) {
 593                 err = -EAGAIN;
 594                 goto out;
 595         }
 596
 597         ilen = min_t(size_t, MAX_INLINE_DATA, i_size_read(inode));
 598         if (start >= ilen)
 599                 goto out;
 600         if (start + len < ilen)
 601                 ilen = start + len;
 602         ilen -= start;
 603
 604         get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
 605         byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
 606         byteaddr += (char *)inline_data_addr(ipage) - (char *)F2FS_INODE(ipage);
 607         err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
 608 out:
 609         f2fs_put_page(ipage, 1);
 610         return err;
 611 }