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))
  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 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  54 {
  55         struct page *ipage;
  56
  57         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  58         if (IS_ERR(ipage)) {
  59                 unlock_page(page);
  60                 return PTR_ERR(ipage);
  61         }
  62
  63         if (!f2fs_has_inline_data(inode)) {
  64                 f2fs_put_page(ipage, 1);
  65                 return -EAGAIN;
  66         }
  67
  68         if (page->index)
  69                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  70         else
  71                 read_inline_data(page, ipage);
  72
  73         SetPageUptodate(page);
  74         f2fs_put_page(ipage, 1);
  75         unlock_page(page);
  76         return 0;
  77 }
  78
  79 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
  80 {
  81         void *src_addr, *dst_addr;
  82         block_t new_blk_addr;
  83         struct f2fs_io_info fio = {
  84                 .type = DATA,
  85                 .rw = WRITE_SYNC | REQ_PRIO,
  86         };
  87         int dirty, err;
  88
  89         f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
  90
  91         if (!f2fs_exist_data(dn->inode))
  92                 goto clear_out;
  93
  94         err = f2fs_reserve_block(dn, 0);
  95         if (err)
  96                 return err;
  97
  98         f2fs_wait_on_page_writeback(page, DATA);
  99
 100         if (PageUptodate(page))
 101                 goto no_update;
 102
 103         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 104
 105         /* Copy the whole inline data block */
 106         src_addr = inline_data_addr(dn->inode_page);
 107         dst_addr = kmap_atomic(page);
 108         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 109         flush_dcache_page(page);
 110         kunmap_atomic(dst_addr);
 111         SetPageUptodate(page);
 112 no_update:
 113         /* clear dirty state */
 114         dirty = clear_page_dirty_for_io(page);
 115
 116         /* write data page to try to make data consistent */
 117         set_page_writeback(page);
 118
 119         write_data_page(page, dn, &new_blk_addr, &fio);
 120         update_extent_cache(new_blk_addr, dn);
 121         f2fs_wait_on_page_writeback(page, DATA);
 122         if (dirty)
 123                 inode_dec_dirty_pages(dn->inode);
 124
 125         /* this converted inline_data should be recovered. */
 126         set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);
 127
 128         /* clear inline data and flag after data writeback */
 129         truncate_inline_data(dn->inode_page, 0);
 130 clear_out:
 131         stat_dec_inline_inode(dn->inode);
 132         f2fs_clear_inline_inode(dn->inode);
 133         sync_inode_page(dn);
 134         f2fs_put_dnode(dn);
 135         return 0;
 136 }
 137
 138 int f2fs_convert_inline_inode(struct inode *inode)
 139 {
 140         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 141         struct dnode_of_data dn;
 142         struct page *ipage, *page;
 143         int err = 0;
 144
 145         page = grab_cache_page(inode->i_mapping, 0);
 146         if (!page)
 147                 return -ENOMEM;
 148
 149         f2fs_lock_op(sbi);
 150
 151         ipage = get_node_page(sbi, inode->i_ino);
 152         if (IS_ERR(ipage)) {
 153                 err = PTR_ERR(ipage);
 154                 goto out;
 155         }
 156
 157         set_new_dnode(&dn, inode, ipage, ipage, 0);
 158
 159         if (f2fs_has_inline_data(inode))
 160                 err = f2fs_convert_inline_page(&dn, page);
 161
 162         f2fs_put_dnode(&dn);
 163 out:
 164         f2fs_unlock_op(sbi);
 165
 166         f2fs_put_page(page, 1);
 167         return err;
 168 }
 169
 170 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 171 {
 172         void *src_addr, *dst_addr;
 173         struct dnode_of_data dn;
 174         int err;
 175
 176         set_new_dnode(&dn, inode, NULL, NULL, 0);
 177         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 178         if (err)
 179                 return err;
 180
 181         if (!f2fs_has_inline_data(inode)) {
 182                 f2fs_put_dnode(&dn);
 183                 return -EAGAIN;
 184         }
 185
 186         f2fs_bug_on(F2FS_I_SB(inode), page->index);
 187
 188         f2fs_wait_on_page_writeback(dn.inode_page, NODE);
 189         src_addr = kmap_atomic(page);
 190         dst_addr = inline_data_addr(dn.inode_page);
 191         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 192         kunmap_atomic(src_addr);
 193
 194         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 195         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 196
 197         sync_inode_page(&dn);
 198         f2fs_put_dnode(&dn);
 199         return 0;
 200 }
 201
 202 void truncate_inline_data(struct page *ipage, u64 from)
 203 {
 204         void *addr;
 205
 206         if (from >= MAX_INLINE_DATA)
 207                 return;
 208
 209         f2fs_wait_on_page_writeback(ipage, NODE);
 210
 211         addr = inline_data_addr(ipage);
 212         memset(addr + from, 0, MAX_INLINE_DATA - from);
 213 }
 214
 215 bool recover_inline_data(struct inode *inode, struct page *npage)
 216 {
 217         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 218         struct f2fs_inode *ri = NULL;
 219         void *src_addr, *dst_addr;
 220         struct page *ipage;
 221
 222         /*
 223          * The inline_data recovery policy is as follows.
 224          * [prev.] [next] of inline_data flag
 225          *    o       o  -> recover inline_data
 226          *    o       x  -> remove inline_data, and then recover data blocks
 227          *    x       o  -> remove inline_data, and then recover inline_data
 228          *    x       x  -> recover data blocks
 229          */
 230         if (IS_INODE(npage))
 231                 ri = F2FS_INODE(npage);
 232
 233         if (f2fs_has_inline_data(inode) &&
 234                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 235 process_inline:
 236                 ipage = get_node_page(sbi, inode->i_ino);
 237                 f2fs_bug_on(sbi, IS_ERR(ipage));
 238
 239                 f2fs_wait_on_page_writeback(ipage, NODE);
 240
 241                 src_addr = inline_data_addr(npage);
 242                 dst_addr = inline_data_addr(ipage);
 243                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 244
 245                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 246                 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 247
 248                 update_inode(inode, ipage);
 249                 f2fs_put_page(ipage, 1);
 250                 return true;
 251         }
 252
 253         if (f2fs_has_inline_data(inode)) {
 254                 ipage = get_node_page(sbi, inode->i_ino);
 255                 f2fs_bug_on(sbi, IS_ERR(ipage));
 256                 truncate_inline_data(ipage, 0);
 257                 f2fs_clear_inline_inode(inode);
 258                 update_inode(inode, ipage);
 259                 f2fs_put_page(ipage, 1);
 260         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 261                 truncate_blocks(inode, 0, false);
 262                 goto process_inline;
 263         }
 264         return false;
 265 }
 266
 267 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 268                                 struct qstr *name, struct page **res_page)
 269 {
 270         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 271         struct f2fs_inline_dentry *inline_dentry;
 272         struct f2fs_dir_entry *de;
 273         struct f2fs_dentry_ptr d;
 274         struct page *ipage;
 275
 276         ipage = get_node_page(sbi, dir->i_ino);
 277         if (IS_ERR(ipage))
 278                 return NULL;
 279
 280         inline_dentry = inline_data_addr(ipage);
 281
 282         make_dentry_ptr(&d, (void *)inline_dentry, 2);
 283         de = find_target_dentry(name, NULL, &d);
 284
 285         unlock_page(ipage);
 286         if (de)
 287                 *res_page = ipage;
 288         else
 289                 f2fs_put_page(ipage, 0);
 290
 291         /*
 292          * For the most part, it should be a bug when name_len is zero.
 293          * We stop here for figuring out where the bugs has occurred.
 294          */
 295         f2fs_bug_on(sbi, d.max < 0);
 296         return de;
 297 }
 298
 299 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 300                                                         struct page **p)
 301 {
 302         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 303         struct page *ipage;
 304         struct f2fs_dir_entry *de;
 305         struct f2fs_inline_dentry *dentry_blk;
 306
 307         ipage = get_node_page(sbi, dir->i_ino);
 308         if (IS_ERR(ipage))
 309                 return NULL;
 310
 311         dentry_blk = inline_data_addr(ipage);
 312         de = &dentry_blk->dentry[1];
 313         *p = ipage;
 314         unlock_page(ipage);
 315         return de;
 316 }
 317
 318 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 319                                                         struct page *ipage)
 320 {
 321         struct f2fs_inline_dentry *dentry_blk;
 322         struct f2fs_dentry_ptr d;
 323
 324         dentry_blk = inline_data_addr(ipage);
 325
 326         make_dentry_ptr(&d, (void *)dentry_blk, 2);
 327         do_make_empty_dir(inode, parent, &d);
 328
 329         set_page_dirty(ipage);
 330
 331         /* update i_size to MAX_INLINE_DATA */
 332         if (i_size_read(inode) < MAX_INLINE_DATA) {
 333                 i_size_write(inode, MAX_INLINE_DATA);
 334                 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 335         }
 336         return 0;
 337 }
 338
 339 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 340                                 struct f2fs_inline_dentry *inline_dentry)
 341 {
 342         struct page *page;
 343         struct dnode_of_data dn;
 344         struct f2fs_dentry_block *dentry_blk;
 345         int err;
 346
 347         page = grab_cache_page(dir->i_mapping, 0);
 348         if (!page)
 349                 return -ENOMEM;
 350
 351         set_new_dnode(&dn, dir, ipage, NULL, 0);
 352         err = f2fs_reserve_block(&dn, 0);
 353         if (err)
 354                 goto out;
 355
 356         f2fs_wait_on_page_writeback(page, DATA);
 357         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 358
 359         dentry_blk = kmap_atomic(page);
 360
 361         /* copy data from inline dentry block to new dentry block */
 362         memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 363                                         INLINE_DENTRY_BITMAP_SIZE);
 364         memcpy(dentry_blk->dentry, inline_dentry->dentry,
 365                         sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 366         memcpy(dentry_blk->filename, inline_dentry->filename,
 367                                         NR_INLINE_DENTRY * F2FS_SLOT_LEN);
 368
 369         kunmap_atomic(dentry_blk);
 370         SetPageUptodate(page);
 371         set_page_dirty(page);
 372
 373         /* clear inline dir and flag after data writeback */
 374         truncate_inline_data(ipage, 0);
 375
 376         stat_dec_inline_dir(dir);
 377         clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 378
 379         if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 380                 i_size_write(dir, PAGE_CACHE_SIZE);
 381                 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 382         }
 383
 384         sync_inode_page(&dn);
 385 out:
 386         f2fs_put_page(page, 1);
 387         return err;
 388 }
 389
 390 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 391                                                 struct inode *inode)
 392 {
 393         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 394         struct page *ipage;
 395         unsigned int bit_pos;
 396         f2fs_hash_t name_hash;
 397         struct f2fs_dir_entry *de;
 398         size_t namelen = name->len;
 399         struct f2fs_inline_dentry *dentry_blk = NULL;
 400         int slots = GET_DENTRY_SLOTS(namelen);
 401         struct page *page;
 402         int err = 0;
 403         int i;
 404
 405         name_hash = f2fs_dentry_hash(name);
 406
 407         ipage = get_node_page(sbi, dir->i_ino);
 408         if (IS_ERR(ipage))
 409                 return PTR_ERR(ipage);
 410
 411         dentry_blk = inline_data_addr(ipage);
 412         bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 413                                                 slots, NR_INLINE_DENTRY);
 414         if (bit_pos >= NR_INLINE_DENTRY) {
 415                 err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 416                 if (!err)
 417                         err = -EAGAIN;
 418                 goto out;
 419         }
 420
 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         f2fs_wait_on_page_writeback(ipage, NODE);
 429         de = &dentry_blk->dentry[bit_pos];
 430         de->hash_code = name_hash;
 431         de->name_len = cpu_to_le16(namelen);
 432         memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
 433         de->ino = cpu_to_le32(inode->i_ino);
 434         set_de_type(de, inode);
 435         for (i = 0; i < slots; i++)
 436                 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
 437         set_page_dirty(ipage);
 438
 439         /* we don't need to mark_inode_dirty now */
 440         F2FS_I(inode)->i_pino = dir->i_ino;
 441         update_inode(inode, page);
 442         f2fs_put_page(page, 1);
 443
 444         update_parent_metadata(dir, inode, 0);
 445 fail:
 446         up_write(&F2FS_I(inode)->i_sem);
 447
 448         if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 449                 update_inode(dir, ipage);
 450                 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 451         }
 452 out:
 453         f2fs_put_page(ipage, 1);
 454         return err;
 455 }
 456
 457 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 458                                         struct inode *dir, struct inode *inode)
 459 {
 460         struct f2fs_inline_dentry *inline_dentry;
 461         int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 462         unsigned int bit_pos;
 463         int i;
 464
 465         lock_page(page);
 466         f2fs_wait_on_page_writeback(page, NODE);
 467
 468         inline_dentry = inline_data_addr(page);
 469         bit_pos = dentry - inline_dentry->dentry;
 470         for (i = 0; i < slots; i++)
 471                 test_and_clear_bit_le(bit_pos + i,
 472                                 &inline_dentry->dentry_bitmap);
 473
 474         set_page_dirty(page);
 475
 476         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 477
 478         if (inode)
 479                 f2fs_drop_nlink(dir, inode, page);
 480
 481         f2fs_put_page(page, 1);
 482 }
 483
 484 bool f2fs_empty_inline_dir(struct inode *dir)
 485 {
 486         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 487         struct page *ipage;
 488         unsigned int bit_pos = 2;
 489         struct f2fs_inline_dentry *dentry_blk;
 490
 491         ipage = get_node_page(sbi, dir->i_ino);
 492         if (IS_ERR(ipage))
 493                 return false;
 494
 495         dentry_blk = inline_data_addr(ipage);
 496         bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 497                                         NR_INLINE_DENTRY,
 498                                         bit_pos);
 499
 500         f2fs_put_page(ipage, 1);
 501
 502         if (bit_pos < NR_INLINE_DENTRY)
 503                 return false;
 504
 505         return true;
 506 }
 507
 508 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
 509 {
 510         struct inode *inode = file_inode(file);
 511         struct f2fs_inline_dentry *inline_dentry = NULL;
 512         struct page *ipage = NULL;
 513         struct f2fs_dentry_ptr d;
 514
 515         if (ctx->pos == NR_INLINE_DENTRY)
 516                 return 0;
 517
 518         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 519         if (IS_ERR(ipage))
 520                 return PTR_ERR(ipage);
 521
 522         inline_dentry = inline_data_addr(ipage);
 523
 524         make_dentry_ptr(&d, (void *)inline_dentry, 2);
 525
 526         if (!f2fs_fill_dentries(ctx, &d, 0))
 527                 ctx->pos = NR_INLINE_DENTRY;
 528
 529         f2fs_put_page(ipage, 1);
 530         return 0;
 531 }