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 qstr *name, 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 f2fs_dir_entry *de;
 292         struct f2fs_dentry_ptr d;
 293         struct page *ipage;
 294
 295         ipage = get_node_page(sbi, dir->i_ino);
 296         if (IS_ERR(ipage))
 297                 return NULL;
 298
 299         inline_dentry = inline_data_addr(ipage);
 300
 301         make_dentry_ptr(&d, (void *)inline_dentry, 2);
 302         de = find_target_dentry(name, NULL, &d);
 303
 304         unlock_page(ipage);
 305         if (de)
 306                 *res_page = ipage;
 307         else
 308                 f2fs_put_page(ipage, 0);
 309
 310         /*
 311          * For the most part, it should be a bug when name_len is zero.
 312          * We stop here for figuring out where the bugs has occurred.
 313          */
 314         f2fs_bug_on(sbi, d.max < 0);
 315         return de;
 316 }
 317
 318 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 319                                                         struct page **p)
 320 {
 321         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 322         struct page *ipage;
 323         struct f2fs_dir_entry *de;
 324         struct f2fs_inline_dentry *dentry_blk;
 325
 326         ipage = get_node_page(sbi, dir->i_ino);
 327         if (IS_ERR(ipage))
 328                 return NULL;
 329
 330         dentry_blk = inline_data_addr(ipage);
 331         de = &dentry_blk->dentry[1];
 332         *p = ipage;
 333         unlock_page(ipage);
 334         return de;
 335 }
 336
 337 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 338                                                         struct page *ipage)
 339 {
 340         struct f2fs_inline_dentry *dentry_blk;
 341         struct f2fs_dentry_ptr d;
 342
 343         dentry_blk = inline_data_addr(ipage);
 344
 345         make_dentry_ptr(&d, (void *)dentry_blk, 2);
 346         do_make_empty_dir(inode, parent, &d);
 347
 348         set_page_dirty(ipage);
 349
 350         /* update i_size to MAX_INLINE_DATA */
 351         if (i_size_read(inode) < MAX_INLINE_DATA) {
 352                 i_size_write(inode, MAX_INLINE_DATA);
 353                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 354         }
 355         return 0;
 356 }
 357
 358 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 359                                 struct f2fs_inline_dentry *inline_dentry)
 360 {
 361         struct page *page;
 362         struct dnode_of_data dn;
 363         struct f2fs_dentry_block *dentry_blk;
 364         int err;
 365
 366         page = grab_cache_page(dir->i_mapping, 0);
 367         if (!page)
 368                 return -ENOMEM;
 369
 370         set_new_dnode(&dn, dir, ipage, NULL, 0);
 371         err = f2fs_reserve_block(&dn, 0);
 372         if (err)
 373                 goto out;
 374
 375         f2fs_wait_on_page_writeback(page, DATA);
 376         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 377
 378         dentry_blk = kmap_atomic(page);
 379
 380         /* copy data from inline dentry block to new dentry block */
 381         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 382                                         INLINE_DENTRY_BITMAP_SIZE);
 383         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 384                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 385         memcpy(dentry_blk->filename, inline_dentry->filename,
 386                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 387
 388         kunmap_atomic(dentry_blk);
 389         SetPageUptodate(page);
 390         set_page_dirty(page);
 391
 392         /* clear inline dir and flag after data writeback */
 393         truncate_inline_inode(ipage, 0);
 394
 395         stat_dec_inline_dir(dir);
 396         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 397
 398         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 399                 i_size_write(dir, PAGE_CACHE_SIZE);
 400                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 401         }
 402
 403         sync_inode_page(&dn);
 404 out:
 405         f2fs_put_page(page, 1);
 406         return err;
 407 }
 408
 409 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 410                         struct inode *inode, nid_t ino, umode_t mode)
 411 {
 412         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 413         struct page *ipage;
 414         unsigned int bit_pos;
 415         f2fs_hash_t name_hash;
 416         size_t namelen = name->len;
 417         struct f2fs_inline_dentry *dentry_blk = NULL;
 418         struct f2fs_dentry_ptr d;
 419         int slots = GET_DENTRY_SLOTS(namelen);
 420         struct page *page = NULL;
 421         int err = 0;
 422
 423         ipage = get_node_page(sbi, dir->i_ino);
 424         if (IS_ERR(ipage))
 425                 return PTR_ERR(ipage);
 426
 427         dentry_blk = inline_data_addr(ipage);
 428         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 429                                                 slots, NR_INLINE_DENTRY);
 430         if (bit_pos >= NR_INLINE_DENTRY) {
 431                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 432                 if (!err)
 433                         err = -EAGAIN;
 434                 goto out;
 435         }
 436
 437         if (inode) {
 438                 down_write(&F2FS_I(inode)->i_sem);
 439                 page = init_inode_metadata(inode, dir, name, ipage);
 440                 if (IS_ERR(page)) {
 441                         err = PTR_ERR(page);
 442                         goto fail;
 443                 }
 444         }
 445
 446         f2fs_wait_on_page_writeback(ipage, NODE);
 447
 448         name_hash = f2fs_dentry_hash(name);
 449         make_dentry_ptr(&d, (void *)dentry_blk, 2);
 450         f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 451
 452         set_page_dirty(ipage);
 453
 454         /* we don't need to mark_inode_dirty now */
 455         if (inode) {
 456                 F2FS_I(inode)->i_pino = dir->i_ino;
 457                 update_inode(inode, page);
 458                 f2fs_put_page(page, 1);
 459         }
 460
 461         update_parent_metadata(dir, inode, 0);
 462 fail:
 463         if (inode)
 464                 up_write(&F2FS_I(inode)->i_sem);
 465
 466         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 467                 update_inode(dir, ipage);
 468                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 469         }
 470 out:
 471         f2fs_put_page(ipage, 1);
 472         return err;
 473 }
 474
 475 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 476                                         struct inode *dir, struct inode *inode)
 477 {
 478         struct f2fs_inline_dentry *inline_dentry;
 479         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 480         unsigned int bit_pos;
 481         int i;
 482
 483         lock_page(page);
 484         f2fs_wait_on_page_writeback(page, NODE);
 485
 486         inline_dentry = inline_data_addr(page);
 487         bit_pos = dentry - inline_dentry->dentry;
 488         for (i = 0; i < slots; i++)
 489                 test_and_clear_bit_le(bit_pos + i,
 490                                 &inline_dentry->dentry_bitmap);
 491
 492         set_page_dirty(page);
 493
 494         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 495
 496         if (inode)
 497                 f2fs_drop_nlink(dir, inode, page);
 498
 499         f2fs_put_page(page, 1);
 500 }
 501
 502 bool f2fs_empty_inline_dir(struct inode *dir)
 503 {
 504         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 505         struct page *ipage;
 506         unsigned int bit_pos = 2;
 507         struct f2fs_inline_dentry *dentry_blk;
 508
 509         ipage = get_node_page(sbi, dir->i_ino);
 510         if (IS_ERR(ipage))
 511                 return false;
 512
 513         dentry_blk = inline_data_addr(ipage);
 514         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 515                                         NR_INLINE_DENTRY,
 516                                         bit_pos);
 517
 518         f2fs_put_page(ipage, 1);
 519
 520         if (bit_pos < NR_INLINE_DENTRY)
 521                 return false;
 522
 523         return true;
 524 }
 525
 526 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
 527 {
 528         struct inode *inode = file_inode(file);
 529         struct f2fs_inline_dentry *inline_dentry = NULL;
 530         struct page *ipage = NULL;
 531         struct f2fs_dentry_ptr d;
 532
 533         if (ctx->pos == NR_INLINE_DENTRY)
 534                 return 0;
 535
 536         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 537         if (IS_ERR(ipage))
 538                 return PTR_ERR(ipage);
 539
 540         inline_dentry = inline_data_addr(ipage);
 541
 542         make_dentry_ptr(&d, (void *)inline_dentry, 2);
 543
 544         if (!f2fs_fill_dentries(ctx, &d, 0))
 545                 ctx->pos = NR_INLINE_DENTRY;
 546
 547         f2fs_put_page(ipage, 1);
 548         return 0;
 549 }