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(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         return true;
  31 }
  32
  33 void read_inline_data(struct page *page, struct page *ipage)
  34 {
  35         void *src_addr, *dst_addr;
  36
  37         if (PageUptodate(page))
  38                 return;
  39
  40         f2fs_bug_on(F2FS_P_SB(page), page->index);
  41
  42         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
  43
  44         /* Copy the whole inline data block */
  45         src_addr = inline_data_addr(ipage);
  46         dst_addr = kmap_atomic(page);
  47         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  48         flush_dcache_page(page);
  49         kunmap_atomic(dst_addr);
  50         SetPageUptodate(page);
  51 }
  52
  53 bool truncate_inline_inode(struct page *ipage, u64 from)
  54 {
  55         void *addr;
  56
  57         if (from >= MAX_INLINE_DATA)
  58                 return false;
  59
  60         addr = inline_data_addr(ipage);
  61
  62         f2fs_wait_on_page_writeback(ipage, NODE);
  63         memset(addr + from, 0, MAX_INLINE_DATA - from);
  64
  65         return true;
  66 }
  67
  68 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  69 {
  70         struct page *ipage;
  71
  72         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  73         if (IS_ERR(ipage)) {
  74                 unlock_page(page);
  75                 return PTR_ERR(ipage);
  76         }
  77
  78         if (!f2fs_has_inline_data(inode)) {
  79                 f2fs_put_page(ipage, 1);
  80                 return -EAGAIN;
  81         }
  82
  83         if (page->index)
  84                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  85         else
  86                 read_inline_data(page, ipage);
  87
  88         SetPageUptodate(page);
  89         f2fs_put_page(ipage, 1);
  90         unlock_page(page);
  91         return 0;
  92 }
  93
  94 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
  95 {
  96         void *src_addr, *dst_addr;
  97         struct f2fs_io_info fio = {
  98                 .type = DATA,
  99                 .rw = WRITE_SYNC | REQ_PRIO,
 100         };
 101         int dirty, err;
 102
 103         f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
 104
 105         if (!f2fs_exist_data(dn->inode))
 106                 goto clear_out;
 107
 108         err = f2fs_reserve_block(dn, 0);
 109         if (err)
 110                 return err;
 111
 112         f2fs_wait_on_page_writeback(page, DATA);
 113
 114         if (PageUptodate(page))
 115                 goto no_update;
 116
 117         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 118
 119         /* Copy the whole inline data block */
 120         src_addr = inline_data_addr(dn->inode_page);
 121         dst_addr = kmap_atomic(page);
 122         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 123         flush_dcache_page(page);
 124         kunmap_atomic(dst_addr);
 125         SetPageUptodate(page);
 126 no_update:
 127         /* clear dirty state */
 128         dirty = clear_page_dirty_for_io(page);
 129
 130         /* write data page to try to make data consistent */
 131         set_page_writeback(page);
 132         fio.blk_addr = dn->data_blkaddr;
 133         write_data_page(page, dn, &fio);
 134         set_data_blkaddr(dn);
 135         f2fs_update_extent_cache(dn);
 136         f2fs_wait_on_page_writeback(page, DATA);
 137         if (dirty)
 138                 inode_dec_dirty_pages(dn->inode);
 139
 140         /* this converted inline_data should be recovered. */
 141         set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);
 142
 143         /* clear inline data and flag after data writeback */
 144         truncate_inline_inode(dn->inode_page, 0);
 145 clear_out:
 146         stat_dec_inline_inode(dn->inode);
 147         f2fs_clear_inline_inode(dn->inode);
 148         sync_inode_page(dn);
 149         f2fs_put_dnode(dn);
 150         return 0;
 151 }
 152
 153 int f2fs_convert_inline_inode(struct inode *inode)
 154 {
 155         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 156         struct dnode_of_data dn;
 157         struct page *ipage, *page;
 158         int err = 0;
 159
 160         page = grab_cache_page(inode->i_mapping, 0);
 161         if (!page)
 162                 return -ENOMEM;
 163
 164         f2fs_lock_op(sbi);
 165
 166         ipage = get_node_page(sbi, inode->i_ino);
 167         if (IS_ERR(ipage)) {
 168                 err = PTR_ERR(ipage);
 169                 goto out;
 170         }
 171
 172         set_new_dnode(&dn, inode, ipage, ipage, 0);
 173
 174         if (f2fs_has_inline_data(inode))
 175                 err = f2fs_convert_inline_page(&dn, page);
 176
 177         f2fs_put_dnode(&dn);
 178 out:
 179         f2fs_unlock_op(sbi);
 180
 181         f2fs_put_page(page, 1);
 182         return err;
 183 }
 184
 185 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 186 {
 187         void *src_addr, *dst_addr;
 188         struct dnode_of_data dn;
 189         int err;
 190
 191         set_new_dnode(&dn, inode, NULL, NULL, 0);
 192         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 193         if (err)
 194                 return err;
 195
 196         if (!f2fs_has_inline_data(inode)) {
 197                 f2fs_put_dnode(&dn);
 198                 return -EAGAIN;
 199         }
 200
 201         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 202
 203         f2fs_wait_on_page_writeback(dn.inode_page, NODE);
 204         src_addr = kmap_atomic(page);
 205         dst_addr = inline_data_addr(dn.inode_page);
 206         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 207         kunmap_atomic(src_addr);
 208
 209         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 210         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 211
 212         sync_inode_page(&dn);
 213         f2fs_put_dnode(&dn);
 214         return 0;
 215 }
 216
 217 bool recover_inline_data(struct inode *inode, struct page *npage)
 218 {
 219         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 220         struct f2fs_inode *ri = NULL;
 221         void *src_addr, *dst_addr;
 222         struct page *ipage;
 223
 224         /*
 225          * The inline_data recovery policy is as follows.
 226          * [prev.] [next] of inline_data flag
 227          *    o       o  -> recover inline_data
 228          *    o       x  -> remove inline_data, and then recover data blocks
 229          *    x       o  -> remove inline_data, and then recover inline_data
 230          *    x       x  -> recover data blocks
 231          */
 232         if (IS_INODE(npage))
 233                 ri = F2FS_INODE(npage);
 234
 235         if (f2fs_has_inline_data(inode) &&
 236                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 237 process_inline:
 238                 ipage = get_node_page(sbi, inode->i_ino);
 239                 f2fs_bug_on(sbi, IS_ERR(ipage));
 240
 241                 f2fs_wait_on_page_writeback(ipage, NODE);
 242
 243                 src_addr = inline_data_addr(npage);
 244                 dst_addr = inline_data_addr(ipage);
 245                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 246
 247                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 248                 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 249
 250                 update_inode(inode, ipage);
 251                 f2fs_put_page(ipage, 1);
 252                 return true;
 253         }
 254
 255         if (f2fs_has_inline_data(inode)) {
 256                 ipage = get_node_page(sbi, inode->i_ino);
 257                 f2fs_bug_on(sbi, IS_ERR(ipage));
 258                 truncate_inline_inode(ipage, 0);
 259                 f2fs_clear_inline_inode(inode);
 260                 update_inode(inode, ipage);
 261                 f2fs_put_page(ipage, 1);
 262         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 263                 truncate_blocks(inode, 0, false);
 264                 goto process_inline;
 265         }
 266         return false;
 267 }
 268
 269 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 270                                 struct qstr *name, struct page **res_page)
 271 {
 272         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 273         struct f2fs_inline_dentry *inline_dentry;
 274         struct f2fs_dir_entry *de;
 275         struct f2fs_dentry_ptr d;
 276         struct page *ipage;
 277
 278         ipage = get_node_page(sbi, dir->i_ino);
 279         if (IS_ERR(ipage))
 280                 return NULL;
 281
 282         inline_dentry = inline_data_addr(ipage);
 283
 284         make_dentry_ptr(&d, (void *)inline_dentry, 2);
 285         de = find_target_dentry(name, NULL, &d);
 286
 287         unlock_page(ipage);
 288         if (de)
 289                 *res_page = ipage;
 290         else
 291                 f2fs_put_page(ipage, 0);
 292
 293         /*
 294          * For the most part, it should be a bug when name_len is zero.
 295          * We stop here for figuring out where the bugs has occurred.
 296          */
 297         f2fs_bug_on(sbi, d.max < 0);
 298         return de;
 299 }
 300
 301 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 302                                                         struct page **p)
 303 {
 304         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 305         struct page *ipage;
 306         struct f2fs_dir_entry *de;
 307         struct f2fs_inline_dentry *dentry_blk;
 308
 309         ipage = get_node_page(sbi, dir->i_ino);
 310         if (IS_ERR(ipage))
 311                 return NULL;
 312
 313         dentry_blk = inline_data_addr(ipage);
 314         de = &dentry_blk->dentry[1];
 315         *p = ipage;
 316         unlock_page(ipage);
 317         return de;
 318 }
 319
 320 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 321                                                         struct page *ipage)
 322 {
 323         struct f2fs_inline_dentry *dentry_blk;
 324         struct f2fs_dentry_ptr d;
 325
 326         dentry_blk = inline_data_addr(ipage);
 327
 328         make_dentry_ptr(&d, (void *)dentry_blk, 2);
 329         do_make_empty_dir(inode, parent, &d);
 330
 331         set_page_dirty(ipage);
 332
 333         /* update i_size to MAX_INLINE_DATA */
 334         if (i_size_read(inode) < MAX_INLINE_DATA) {
 335                 i_size_write(inode, MAX_INLINE_DATA);
 336                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 337         }
 338         return 0;
 339 }
 340
 341 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 342                                 struct f2fs_inline_dentry *inline_dentry)
 343 {
 344         struct page *page;
 345         struct dnode_of_data dn;
 346         struct f2fs_dentry_block *dentry_blk;
 347         int err;
 348
 349         page = grab_cache_page(dir->i_mapping, 0);
 350         if (!page)
 351                 return -ENOMEM;
 352
 353         set_new_dnode(&dn, dir, ipage, NULL, 0);
 354         err = f2fs_reserve_block(&dn, 0);
 355         if (err)
 356                 goto out;
 357
 358         f2fs_wait_on_page_writeback(page, DATA);
 359         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 360
 361         dentry_blk = kmap_atomic(page);
 362
 363         /* copy data from inline dentry block to new dentry block */
 364         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 365                                         INLINE_DENTRY_BITMAP_SIZE);
 366         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 367                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 368         memcpy(dentry_blk->filename, inline_dentry->filename,
 369                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 370
 371         kunmap_atomic(dentry_blk);
 372         SetPageUptodate(page);
 373         set_page_dirty(page);
 374
 375         /* clear inline dir and flag after data writeback */
 376         truncate_inline_inode(ipage, 0);
 377
 378         stat_dec_inline_dir(dir);
 379         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 380
 381         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 382                 i_size_write(dir, PAGE_CACHE_SIZE);
 383                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 384         }
 385
 386         sync_inode_page(&dn);
 387 out:
 388         f2fs_put_page(page, 1);
 389         return err;
 390 }
 391
 392 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 393                         struct inode *inode, nid_t ino, umode_t mode)
 394 {
 395         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 396         struct page *ipage;
 397         unsigned int bit_pos;
 398         f2fs_hash_t name_hash;
 399         size_t namelen = name->len;
 400         struct f2fs_inline_dentry *dentry_blk = NULL;
 401         struct f2fs_dentry_ptr d;
 402         int slots = GET_DENTRY_SLOTS(namelen);
 403         struct page *page = NULL;
 404         int err = 0;
 405
 406         ipage = get_node_page(sbi, dir->i_ino);
 407         if (IS_ERR(ipage))
 408                 return PTR_ERR(ipage);
 409
 410         dentry_blk = inline_data_addr(ipage);
 411         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 412                                                 slots, NR_INLINE_DENTRY);
 413         if (bit_pos >= NR_INLINE_DENTRY) {
 414                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 415                 if (!err)
 416                         err = -EAGAIN;
 417                 goto out;
 418         }
 419
 420         if (inode) {
 421                 down_write(&F2FS_I(inode)->i_sem);
 422                 page = init_inode_metadata(inode, dir, name, ipage);
 423                 if (IS_ERR(page)) {
 424                         err = PTR_ERR(page);
 425                         goto fail;
 426                 }
 427         }
 428
 429         f2fs_wait_on_page_writeback(ipage, NODE);
 430
 431         name_hash = f2fs_dentry_hash(name);
 432         make_dentry_ptr(&d, (void *)dentry_blk, 2);
 433         f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
 434
 435         set_page_dirty(ipage);
 436
 437         /* we don't need to mark_inode_dirty now */
 438         if (inode) {
 439                 F2FS_I(inode)->i_pino = dir->i_ino;
 440                 update_inode(inode, page);
 441                 f2fs_put_page(page, 1);
 442         }
 443
 444         update_parent_metadata(dir, inode, 0);
 445 fail:
 446         if (inode)
 447                 up_write(&F2FS_I(inode)->i_sem);
 448
 449         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 450                 update_inode(dir, ipage);
 451                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 452         }
 453 out:
 454         f2fs_put_page(ipage, 1);
 455         return err;
 456 }
 457
 458 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 459                                         struct inode *dir, struct inode *inode)
 460 {
 461         struct f2fs_inline_dentry *inline_dentry;
 462         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 463         unsigned int bit_pos;
 464         int i;
 465
 466         lock_page(page);
 467         f2fs_wait_on_page_writeback(page, NODE);
 468
 469         inline_dentry = inline_data_addr(page);
 470         bit_pos = dentry - inline_dentry->dentry;
 471         for (i = 0; i < slots; i++)
 472                 test_and_clear_bit_le(bit_pos + i,
 473                                 &inline_dentry->dentry_bitmap);
 474
 475         set_page_dirty(page);
 476
 477         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 478
 479         if (inode)
 480                 f2fs_drop_nlink(dir, inode, page);
 481
 482         f2fs_put_page(page, 1);
 483 }
 484
 485 bool f2fs_empty_inline_dir(struct inode *dir)
 486 {
 487         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 488         struct page *ipage;
 489         unsigned int bit_pos = 2;
 490         struct f2fs_inline_dentry *dentry_blk;
 491
 492         ipage = get_node_page(sbi, dir->i_ino);
 493         if (IS_ERR(ipage))
 494                 return false;
 495
 496         dentry_blk = inline_data_addr(ipage);
 497         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 498                                         NR_INLINE_DENTRY,
 499                                         bit_pos);
 500
 501         f2fs_put_page(ipage, 1);
 502
 503         if (bit_pos < NR_INLINE_DENTRY)
 504                 return false;
 505
 506         return true;
 507 }
 508
 509 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
 510 {
 511         struct inode *inode = file_inode(file);
 512         struct f2fs_inline_dentry *inline_dentry = NULL;
 513         struct page *ipage = NULL;
 514         struct f2fs_dentry_ptr d;
 515
 516         if (ctx->pos == NR_INLINE_DENTRY)
 517                 return 0;
 518
 519         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 520         if (IS_ERR(ipage))
 521                 return PTR_ERR(ipage);
 522
 523         inline_dentry = inline_data_addr(ipage);
 524
 525         make_dentry_ptr(&d, (void *)inline_dentry, 2);
 526
 527         if (!f2fs_fill_dentries(ctx, &d, 0))
 528                 ctx->pos = NR_INLINE_DENTRY;
 529
 530         f2fs_put_page(ipage, 1);
 531         return 0;
 532 }