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