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         /* 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         page = grab_cache_page(inode->i_mapping, 0);
 178         if (!page)
 179                 return -ENOMEM;
 180
 181         f2fs_lock_op(sbi);
 182
 183         ipage = get_node_page(sbi, inode->i_ino);
 184         if (IS_ERR(ipage)) {
 185                 err = PTR_ERR(ipage);
 186                 goto out;
 187         }
 188
 189         set_new_dnode(&dn, inode, ipage, ipage, 0);
 190
 191         if (f2fs_has_inline_data(inode))
 192                 err = f2fs_convert_inline_page(&dn, page);
 193
 194         f2fs_put_dnode(&dn);
 195 out:
 196         f2fs_unlock_op(sbi);
 197
 198         f2fs_put_page(page, 1);
 199         return err;
 200 }
 201
 202 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 203 {
 204         void *src_addr, *dst_addr;
 205         struct dnode_of_data dn;
 206         int err;
 207
 208         set_new_dnode(&dn, inode, NULL, NULL, 0);
 209         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 210         if (err)
 211                 return err;
 212
 213         if (!f2fs_has_inline_data(inode)) {
 214                 f2fs_put_dnode(&dn);
 215                 return -EAGAIN;
 216         }
 217
 218         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 219
 220         f2fs_wait_on_page_writeback(dn.inode_page, NODE);
 221         src_addr = kmap_atomic(page);
 222         dst_addr = inline_data_addr(dn.inode_page);
 223         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 224         kunmap_atomic(src_addr);
 225
 226         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 227         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 228
 229         sync_inode_page(&dn);
 230         f2fs_put_dnode(&dn);
 231         return 0;
 232 }
 233
 234 bool recover_inline_data(struct inode *inode, struct page *npage)
 235 {
 236         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 237         struct f2fs_inode *ri = NULL;
 238         void *src_addr, *dst_addr;
 239         struct page *ipage;
 240
 241         /*
 242          * The inline_data recovery policy is as follows.
 243          * [prev.] [next] of inline_data flag
 244          *    o       o  -> recover inline_data
 245          *    o       x  -> remove inline_data, and then recover data blocks
 246          *    x       o  -> remove inline_data, and then recover inline_data
 247          *    x       x  -> recover data blocks
 248          */
 249         if (IS_INODE(npage))
 250                 ri = F2FS_INODE(npage);
 251
 252         if (f2fs_has_inline_data(inode) &&
 253                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 254 process_inline:
 255                 ipage = get_node_page(sbi, inode->i_ino);
 256                 f2fs_bug_on(sbi, IS_ERR(ipage));
 257
 258                 f2fs_wait_on_page_writeback(ipage, NODE);
 259
 260                 src_addr = inline_data_addr(npage);
 261                 dst_addr = inline_data_addr(ipage);
 262                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 263
 264                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 265                 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 266
 267                 update_inode(inode, ipage);
 268                 f2fs_put_page(ipage, 1);
 269                 return true;
 270         }
 271
 272         if (f2fs_has_inline_data(inode)) {
 273                 ipage = get_node_page(sbi, inode->i_ino);
 274                 f2fs_bug_on(sbi, IS_ERR(ipage));
 275                 truncate_inline_inode(ipage, 0);
 276                 f2fs_clear_inline_inode(inode);
 277                 update_inode(inode, ipage);
 278                 f2fs_put_page(ipage, 1);
 279         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 280                 truncate_blocks(inode, 0, false);
 281                 goto process_inline;
 282         }
 283         return false;
 284 }
 285
 286 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 287                         struct f2fs_filename *fname, struct page **res_page)
 288 {
 289         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 290         struct f2fs_inline_dentry *inline_dentry;
 291         struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 292         struct f2fs_dir_entry *de;
 293         struct f2fs_dentry_ptr d;
 294         struct page *ipage;
 295         f2fs_hash_t namehash;
 296
 297         ipage = get_node_page(sbi, dir->i_ino);
 298         if (IS_ERR(ipage))
 299                 return NULL;
 300
 301         namehash = f2fs_dentry_hash(&name);
 302
 303         inline_dentry = inline_data_addr(ipage);
 304
 305         make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
 306         de = find_target_dentry(fname, namehash, NULL, &d);
 307         unlock_page(ipage);
 308         if (de)
 309                 *res_page = ipage;
 310         else
 311                 f2fs_put_page(ipage, 0);
 312
 313         /*
 314          * For the most part, it should be a bug when name_len is zero.
 315          * We stop here for figuring out where the bugs has occurred.
 316          */
 317         f2fs_bug_on(sbi, d.max < 0);
 318         return de;
 319 }
 320
 321 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 322                                                         struct page **p)
 323 {
 324         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 325         struct page *ipage;
 326         struct f2fs_dir_entry *de;
 327         struct f2fs_inline_dentry *dentry_blk;
 328
 329         ipage = get_node_page(sbi, dir->i_ino);
 330         if (IS_ERR(ipage))
 331                 return NULL;
 332
 333         dentry_blk = inline_data_addr(ipage);
 334         de = &dentry_blk->dentry[1];
 335         *p = ipage;
 336         unlock_page(ipage);
 337         return de;
 338 }
 339
 340 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 341                                                         struct page *ipage)
 342 {
 343         struct f2fs_inline_dentry *dentry_blk;
 344         struct f2fs_dentry_ptr d;
 345
 346         dentry_blk = inline_data_addr(ipage);
 347
 348         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 349         do_make_empty_dir(inode, parent, &d);
 350
 351         set_page_dirty(ipage);
 352
 353         /* update i_size to MAX_INLINE_DATA */
 354         if (i_size_read(inode) < MAX_INLINE_DATA) {
 355                 i_size_write(inode, MAX_INLINE_DATA);
 356                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 357         }
 358         return 0;
 359 }
 360
 361 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 362                                 struct f2fs_inline_dentry *inline_dentry)
 363 {
 364         struct page *page;
 365         struct dnode_of_data dn;
 366         struct f2fs_dentry_block *dentry_blk;
 367         int err;
 368
 369         page = grab_cache_page(dir->i_mapping, 0);
 370         if (!page)
 371                 return -ENOMEM;
 372
 373         set_new_dnode(&dn, dir, ipage, NULL, 0);
 374         err = f2fs_reserve_block(&dn, 0);
 375         if (err)
 376                 goto out;
 377
 378         f2fs_wait_on_page_writeback(page, DATA);
 379         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 380
 381         dentry_blk = kmap_atomic(page);
 382
 383         /* copy data from inline dentry block to new dentry block */
 384         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 385                                         INLINE_DENTRY_BITMAP_SIZE);
 386         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 387                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 388         memcpy(dentry_blk->filename, inline_dentry->filename,
 389                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 390
 391         kunmap_atomic(dentry_blk);
 392         SetPageUptodate(page);
 393         set_page_dirty(page);
 394
 395         /* clear inline dir and flag after data writeback */
 396         truncate_inline_inode(ipage, 0);
 397
 398         stat_dec_inline_dir(dir);
 399         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 400
 401         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 402                 i_size_write(dir, PAGE_CACHE_SIZE);
 403                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 404         }
 405
 406         sync_inode_page(&dn);
 407 out:
 408         f2fs_put_page(page, 1);
 409         return err;
 410 }
 411
 412 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 413                         struct inode *inode, nid_t ino, umode_t mode)
 414 {
 415         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 416         struct page *ipage;
 417         unsigned int bit_pos;
 418         f2fs_hash_t name_hash;
 419         size_t namelen = name->len;
 420         struct f2fs_inline_dentry *dentry_blk = NULL;
 421         struct f2fs_dentry_ptr d;
 422         int slots = GET_DENTRY_SLOTS(namelen);
 423         struct page *page = NULL;
 424         int err = 0;
 425
 426         ipage = get_node_page(sbi, dir->i_ino);
 427         if (IS_ERR(ipage))
 428                 return PTR_ERR(ipage);
 429
 430         dentry_blk = inline_data_addr(ipage);
 431         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 432                                                 slots, NR_INLINE_DENTRY);
 433         if (bit_pos >= NR_INLINE_DENTRY) {
 434                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 435                 if (!err)
 436                         err = -EAGAIN;
 437                 goto out;
 438         }
 439
 440         if (inode) {
 441                 down_write(&F2FS_I(inode)->i_sem);
 442                 page = init_inode_metadata(inode, dir, name, ipage);
 443                 if (IS_ERR(page)) {
 444                         err = PTR_ERR(page);
 445                         goto fail;
 446                 }
 447         }
 448
 449         f2fs_wait_on_page_writeback(ipage, NODE);
 450
 451         name_hash = f2fs_dentry_hash(name);
 452         make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 453         f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 454
 455         set_page_dirty(ipage);
 456
 457         /* we don't need to mark_inode_dirty now */
 458         if (inode) {
 459                 F2FS_I(inode)->i_pino = dir->i_ino;
 460                 update_inode(inode, page);
 461                 f2fs_put_page(page, 1);
 462         }
 463
 464         update_parent_metadata(dir, inode, 0);
 465 fail:
 466         if (inode)
 467                 up_write(&F2FS_I(inode)->i_sem);
 468
 469         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 470                 update_inode(dir, ipage);
 471                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 472         }
 473 out:
 474         f2fs_put_page(ipage, 1);
 475         return err;
 476 }
 477
 478 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 479                                         struct inode *dir, struct inode *inode)
 480 {
 481         struct f2fs_inline_dentry *inline_dentry;
 482         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 483         unsigned int bit_pos;
 484         int i;
 485
 486         lock_page(page);
 487         f2fs_wait_on_page_writeback(page, NODE);
 488
 489         inline_dentry = inline_data_addr(page);
 490         bit_pos = dentry - inline_dentry->dentry;
 491         for (i = 0; i < slots; i++)
 492                 test_and_clear_bit_le(bit_pos + i,
 493                                 &inline_dentry->dentry_bitmap);
 494
 495         set_page_dirty(page);
 496
 497         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 498
 499         if (inode)
 500                 f2fs_drop_nlink(dir, inode, page);
 501
 502         f2fs_put_page(page, 1);
 503 }
 504
 505 bool f2fs_empty_inline_dir(struct inode *dir)
 506 {
 507         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 508         struct page *ipage;
 509         unsigned int bit_pos = 2;
 510         struct f2fs_inline_dentry *dentry_blk;
 511
 512         ipage = get_node_page(sbi, dir->i_ino);
 513         if (IS_ERR(ipage))
 514                 return false;
 515
 516         dentry_blk = inline_data_addr(ipage);
 517         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 518                                         NR_INLINE_DENTRY,
 519                                         bit_pos);
 520
 521         f2fs_put_page(ipage, 1);
 522
 523         if (bit_pos < NR_INLINE_DENTRY)
 524                 return false;
 525
 526         return true;
 527 }
 528
 529 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 530                                 struct f2fs_str *fstr)
 531 {
 532         struct inode *inode = file_inode(file);
 533         struct f2fs_inline_dentry *inline_dentry = NULL;
 534         struct page *ipage = NULL;
 535         struct f2fs_dentry_ptr d;
 536
 537         if (ctx->pos == NR_INLINE_DENTRY)
 538                 return 0;
 539
 540         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 541         if (IS_ERR(ipage))
 542                 return PTR_ERR(ipage);
 543
 544         inline_dentry = inline_data_addr(ipage);
 545
 546         make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);
 547
 548         if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
 549                 ctx->pos = NR_INLINE_DENTRY;
 550
 551         f2fs_put_page(ipage, 1);
 552         return 0;
 553 }