fs/f2fs/file.c

   1 /*
   2  * fs/f2fs/file.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/stat.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/writeback.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/falloc.h>
  18 #include <linux/types.h>
  19 #include <linux/compat.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/mount.h>
  22 #include <linux/pagevec.h>
  23
  24 #include "f2fs.h"
  25 #include "node.h"
  26 #include "segment.h"
  27 #include "xattr.h"
  28 #include "acl.h"
  29 #include <trace/events/f2fs.h>
  30
  31 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
  32                                                 struct vm_fault *vmf)
  33 {
  34         struct page *page = vmf->page;
  35         struct inode *inode = file_inode(vma->vm_file);
  36         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  37         struct dnode_of_data dn;
  38         int err;
  39
  40         f2fs_balance_fs(sbi);
  41
  42         sb_start_pagefault(inode->i_sb);
  43
  44         /* force to convert with normal data indices */
  45         err = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, page);
  46         if (err)
  47                 goto out;
  48
  49         /* block allocation */
  50         f2fs_lock_op(sbi);
  51         set_new_dnode(&dn, inode, NULL, NULL, 0);
  52         err = f2fs_reserve_block(&dn, page->index);
  53         f2fs_unlock_op(sbi);
  54         if (err)
  55                 goto out;
  56
  57         file_update_time(vma->vm_file);
  58         lock_page(page);
  59         if (unlikely(page->mapping != inode->i_mapping ||
  60                         page_offset(page) > i_size_read(inode) ||
  61                         !PageUptodate(page))) {
  62                 unlock_page(page);
  63                 err = -EFAULT;
  64                 goto out;
  65         }
  66
  67         /*
  68          * check to see if the page is mapped already (no holes)
  69          */
  70         if (PageMappedToDisk(page))
  71                 goto mapped;
  72
  73         /* page is wholly or partially inside EOF */
  74         if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
  75                 unsigned offset;
  76                 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
  77                 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
  78         }
  79         set_page_dirty(page);
  80         SetPageUptodate(page);
  81
  82         trace_f2fs_vm_page_mkwrite(page, DATA);
  83 mapped:
  84         /* fill the page */
  85         f2fs_wait_on_page_writeback(page, DATA);
  86 out:
  87         sb_end_pagefault(inode->i_sb);
  88         return block_page_mkwrite_return(err);
  89 }
  90
  91 static const struct vm_operations_struct f2fs_file_vm_ops = {
  92         .fault          = filemap_fault,
  93         .map_pages      = filemap_map_pages,
  94         .page_mkwrite   = f2fs_vm_page_mkwrite,
  95         .remap_pages    = generic_file_remap_pages,
  96 };
  97
  98 static int get_parent_ino(struct inode *inode, nid_t *pino)
  99 {
 100         struct dentry *dentry;
 101
 102         inode = igrab(inode);
 103         dentry = d_find_any_alias(inode);
 104         iput(inode);
 105         if (!dentry)
 106                 return 0;
 107
 108         if (update_dent_inode(inode, &dentry->d_name)) {
 109                 dput(dentry);
 110                 return 0;
 111         }
 112
 113         *pino = parent_ino(dentry);
 114         dput(dentry);
 115         return 1;
 116 }
 117
 118 static inline bool need_do_checkpoint(struct inode *inode)
 119 {
 120         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 121         bool need_cp = false;
 122
 123         if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
 124                 need_cp = true;
 125         else if (file_wrong_pino(inode))
 126                 need_cp = true;
 127         else if (!space_for_roll_forward(sbi))
 128                 need_cp = true;
 129         else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
 130                 need_cp = true;
 131         else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
 132                 need_cp = true;
 133
 134         return need_cp;
 135 }
 136
 137 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 138 {
 139         struct inode *inode = file->f_mapping->host;
 140         struct f2fs_inode_info *fi = F2FS_I(inode);
 141         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 142         int ret = 0;
 143         bool need_cp = false;
 144         struct writeback_control wbc = {
 145                 .sync_mode = WB_SYNC_ALL,
 146                 .nr_to_write = LONG_MAX,
 147                 .for_reclaim = 0,
 148         };
 149
 150         if (unlikely(f2fs_readonly(inode->i_sb)))
 151                 return 0;
 152
 153         trace_f2fs_sync_file_enter(inode);
 154
 155         /* if fdatasync is triggered, let's do in-place-update */
 156         if (datasync)
 157                 set_inode_flag(fi, FI_NEED_IPU);
 158
 159         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 160         if (datasync)
 161                 clear_inode_flag(fi, FI_NEED_IPU);
 162         if (ret) {
 163                 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 164                 return ret;
 165         }
 166
 167         /*
 168          * if there is no written data, don't waste time to write recovery info.
 169          */
 170         if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
 171                 !exist_written_data(sbi, inode->i_ino, APPEND_INO)) {
 172                 if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
 173                         exist_written_data(sbi, inode->i_ino, UPDATE_INO))
 174                         goto flush_out;
 175                 goto out;
 176         }
 177
 178         /* guarantee free sections for fsync */
 179         f2fs_balance_fs(sbi);
 180
 181         /*
 182          * Both of fdatasync() and fsync() are able to be recovered from
 183          * sudden-power-off.
 184          */
 185         down_read(&fi->i_sem);
 186         need_cp = need_do_checkpoint(inode);
 187         up_read(&fi->i_sem);
 188
 189         if (need_cp) {
 190                 nid_t pino;
 191
 192                 /* all the dirty node pages should be flushed for POR */
 193                 ret = f2fs_sync_fs(inode->i_sb, 1);
 194
 195                 down_write(&fi->i_sem);
 196                 F2FS_I(inode)->xattr_ver = 0;
 197                 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
 198                                         get_parent_ino(inode, &pino)) {
 199                         F2FS_I(inode)->i_pino = pino;
 200                         file_got_pino(inode);
 201                         up_write(&fi->i_sem);
 202                         mark_inode_dirty_sync(inode);
 203                         ret = f2fs_write_inode(inode, NULL);
 204                         if (ret)
 205                                 goto out;
 206                 } else {
 207                         up_write(&fi->i_sem);
 208                 }
 209         } else {
 210                 /* if there is no written node page, write its inode page */
 211                 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
 212                         if (fsync_mark_done(sbi, inode->i_ino))
 213                                 goto out;
 214                         mark_inode_dirty_sync(inode);
 215                         ret = f2fs_write_inode(inode, NULL);
 216                         if (ret)
 217                                 goto out;
 218                 }
 219                 ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
 220                 if (ret)
 221                         goto out;
 222
 223                 /* once recovery info is written, don't need to tack this */
 224                 remove_dirty_inode(sbi, inode->i_ino, APPEND_INO);
 225                 clear_inode_flag(fi, FI_APPEND_WRITE);
 226 flush_out:
 227                 remove_dirty_inode(sbi, inode->i_ino, UPDATE_INO);
 228                 clear_inode_flag(fi, FI_UPDATE_WRITE);
 229                 ret = f2fs_issue_flush(F2FS_SB(inode->i_sb));
 230         }
 231 out:
 232         trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 233         return ret;
 234 }
 235
 236 static pgoff_t __get_first_dirty_index(struct address_space *mapping,
 237                                                 pgoff_t pgofs, int whence)
 238 {
 239         struct pagevec pvec;
 240         int nr_pages;
 241
 242         if (whence != SEEK_DATA)
 243                 return 0;
 244
 245         /* find first dirty page index */
 246         pagevec_init(&pvec, 0);
 247         nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
 248                                         PAGECACHE_TAG_DIRTY, 1);
 249         pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
 250         pagevec_release(&pvec);
 251         return pgofs;
 252 }
 253
 254 static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
 255                                                         int whence)
 256 {
 257         switch (whence) {
 258         case SEEK_DATA:
 259                 if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
 260                         (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
 261                         return true;
 262                 break;
 263         case SEEK_HOLE:
 264                 if (blkaddr == NULL_ADDR)
 265                         return true;
 266                 break;
 267         }
 268         return false;
 269 }
 270
 271 static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 272 {
 273         struct inode *inode = file->f_mapping->host;
 274         loff_t maxbytes = inode->i_sb->s_maxbytes;
 275         struct dnode_of_data dn;
 276         pgoff_t pgofs, end_offset, dirty;
 277         loff_t data_ofs = offset;
 278         loff_t isize;
 279         int err = 0;
 280
 281         mutex_lock(&inode->i_mutex);
 282
 283         isize = i_size_read(inode);
 284         if (offset >= isize)
 285                 goto fail;
 286
 287         /* handle inline data case */
 288         if (f2fs_has_inline_data(inode)) {
 289                 if (whence == SEEK_HOLE)
 290                         data_ofs = isize;
 291                 goto found;
 292         }
 293
 294         pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);
 295
 296         dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
 297
 298         for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) {
 299                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 300                 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
 301                 if (err && err != -ENOENT) {
 302                         goto fail;
 303                 } else if (err == -ENOENT) {
 304                         /* direct node does not exists */
 305                         if (whence == SEEK_DATA) {
 306                                 pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
 307                                                         F2FS_I(inode));
 308                                 continue;
 309                         } else {
 310                                 goto found;
 311                         }
 312                 }
 313
 314                 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 315
 316                 /* find data/hole in dnode block */
 317                 for (; dn.ofs_in_node < end_offset;
 318                                 dn.ofs_in_node++, pgofs++,
 319                                 data_ofs = pgofs << PAGE_CACHE_SHIFT) {
 320                         block_t blkaddr;
 321                         blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
 322
 323                         if (__found_offset(blkaddr, dirty, pgofs, whence)) {
 324                                 f2fs_put_dnode(&dn);
 325                                 goto found;
 326                         }
 327                 }
 328                 f2fs_put_dnode(&dn);
 329         }
 330
 331         if (whence == SEEK_DATA)
 332                 goto fail;
 333 found:
 334         if (whence == SEEK_HOLE && data_ofs > isize)
 335                 data_ofs = isize;
 336         mutex_unlock(&inode->i_mutex);
 337         return vfs_setpos(file, data_ofs, maxbytes);
 338 fail:
 339         mutex_unlock(&inode->i_mutex);
 340         return -ENXIO;
 341 }
 342
 343 static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
 344 {
 345         struct inode *inode = file->f_mapping->host;
 346         loff_t maxbytes = inode->i_sb->s_maxbytes;
 347
 348         switch (whence) {
 349         case SEEK_SET:
 350         case SEEK_CUR:
 351         case SEEK_END:
 352                 return generic_file_llseek_size(file, offset, whence,
 353                                                 maxbytes, i_size_read(inode));
 354         case SEEK_DATA:
 355         case SEEK_HOLE:
 356                 return f2fs_seek_block(file, offset, whence);
 357         }
 358
 359         return -EINVAL;
 360 }
 361
 362 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 363 {
 364         file_accessed(file);
 365         vma->vm_ops = &f2fs_file_vm_ops;
 366         return 0;
 367 }
 368
 369 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
 370 {
 371         int nr_free = 0, ofs = dn->ofs_in_node;
 372         struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
 373         struct f2fs_node *raw_node;
 374         __le32 *addr;
 375
 376         raw_node = F2FS_NODE(dn->node_page);
 377         addr = blkaddr_in_node(raw_node) + ofs;
 378
 379         for (; count > 0; count--, addr++, dn->ofs_in_node++) {
 380                 block_t blkaddr = le32_to_cpu(*addr);
 381                 if (blkaddr == NULL_ADDR)
 382                         continue;
 383
 384                 update_extent_cache(NULL_ADDR, dn);
 385                 invalidate_blocks(sbi, blkaddr);
 386                 nr_free++;
 387         }
 388         if (nr_free) {
 389                 dec_valid_block_count(sbi, dn->inode, nr_free);
 390                 set_page_dirty(dn->node_page);
 391                 sync_inode_page(dn);
 392         }
 393         dn->ofs_in_node = ofs;
 394
 395         trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
 396                                          dn->ofs_in_node, nr_free);
 397         return nr_free;
 398 }
 399
 400 void truncate_data_blocks(struct dnode_of_data *dn)
 401 {
 402         truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
 403 }
 404
 405 static void truncate_partial_data_page(struct inode *inode, u64 from)
 406 {
 407         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
 408         struct page *page;
 409
 410         if (f2fs_has_inline_data(inode))
 411                 return truncate_inline_data(inode, from);
 412
 413         if (!offset)
 414                 return;
 415
 416         page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
 417         if (IS_ERR(page))
 418                 return;
 419
 420         lock_page(page);
 421         if (unlikely(!PageUptodate(page) ||
 422                         page->mapping != inode->i_mapping))
 423                 goto out;
 424
 425         f2fs_wait_on_page_writeback(page, DATA);
 426         zero_user(page, offset, PAGE_CACHE_SIZE - offset);
 427         set_page_dirty(page);
 428
 429 out:
 430         f2fs_put_page(page, 1);
 431 }
 432
 433 int truncate_blocks(struct inode *inode, u64 from, bool lock)
 434 {
 435         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 436         unsigned int blocksize = inode->i_sb->s_blocksize;
 437         struct dnode_of_data dn;
 438         pgoff_t free_from;
 439         int count = 0, err = 0;
 440
 441         trace_f2fs_truncate_blocks_enter(inode, from);
 442
 443         if (f2fs_has_inline_data(inode))
 444                 goto done;
 445
 446         free_from = (pgoff_t)
 447                         ((from + blocksize - 1) >> (sbi->log_blocksize));
 448
 449         if (lock)
 450                 f2fs_lock_op(sbi);
 451
 452         set_new_dnode(&dn, inode, NULL, NULL, 0);
 453         err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
 454         if (err) {
 455                 if (err == -ENOENT)
 456                         goto free_next;
 457                 if (lock)
 458                         f2fs_unlock_op(sbi);
 459                 trace_f2fs_truncate_blocks_exit(inode, err);
 460                 return err;
 461         }
 462
 463         count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 464
 465         count -= dn.ofs_in_node;
 466         f2fs_bug_on(count < 0);
 467
 468         if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
 469                 truncate_data_blocks_range(&dn, count);
 470                 free_from += count;
 471         }
 472
 473         f2fs_put_dnode(&dn);
 474 free_next:
 475         err = truncate_inode_blocks(inode, free_from);
 476         if (lock)
 477                 f2fs_unlock_op(sbi);
 478 done:
 479         /* lastly zero out the first data page */
 480         truncate_partial_data_page(inode, from);
 481
 482         trace_f2fs_truncate_blocks_exit(inode, err);
 483         return err;
 484 }
 485
 486 void f2fs_truncate(struct inode *inode)
 487 {
 488         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 489                                 S_ISLNK(inode->i_mode)))
 490                 return;
 491
 492         trace_f2fs_truncate(inode);
 493
 494         if (!truncate_blocks(inode, i_size_read(inode), true)) {
 495                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 496                 mark_inode_dirty(inode);
 497         }
 498 }
 499
 500 int f2fs_getattr(struct vfsmount *mnt,
 501                          struct dentry *dentry, struct kstat *stat)
 502 {
 503         struct inode *inode = dentry->d_inode;
 504         generic_fillattr(inode, stat);
 505         stat->blocks <<= 3;
 506         return 0;
 507 }
 508
 509 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 510 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
 511 {
 512         struct f2fs_inode_info *fi = F2FS_I(inode);
 513         unsigned int ia_valid = attr->ia_valid;
 514
 515         if (ia_valid & ATTR_UID)
 516                 inode->i_uid = attr->ia_uid;
 517         if (ia_valid & ATTR_GID)
 518                 inode->i_gid = attr->ia_gid;
 519         if (ia_valid & ATTR_ATIME)
 520                 inode->i_atime = timespec_trunc(attr->ia_atime,
 521                                                 inode->i_sb->s_time_gran);
 522         if (ia_valid & ATTR_MTIME)
 523                 inode->i_mtime = timespec_trunc(attr->ia_mtime,
 524                                                 inode->i_sb->s_time_gran);
 525         if (ia_valid & ATTR_CTIME)
 526                 inode->i_ctime = timespec_trunc(attr->ia_ctime,
 527                                                 inode->i_sb->s_time_gran);
 528         if (ia_valid & ATTR_MODE) {
 529                 umode_t mode = attr->ia_mode;
 530
 531                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 532                         mode &= ~S_ISGID;
 533                 set_acl_inode(fi, mode);
 534         }
 535 }
 536 #else
 537 #define __setattr_copy setattr_copy
 538 #endif
 539
 540 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 541 {
 542         struct inode *inode = dentry->d_inode;
 543         struct f2fs_inode_info *fi = F2FS_I(inode);
 544         int err;
 545
 546         err = inode_change_ok(inode, attr);
 547         if (err)
 548                 return err;
 549
 550         if ((attr->ia_valid & ATTR_SIZE) &&
 551                         attr->ia_size != i_size_read(inode)) {
 552                 err = f2fs_convert_inline_data(inode, attr->ia_size, NULL);
 553                 if (err)
 554                         return err;
 555
 556                 truncate_setsize(inode, attr->ia_size);
 557                 f2fs_truncate(inode);
 558                 f2fs_balance_fs(F2FS_SB(inode->i_sb));
 559         }
 560
 561         __setattr_copy(inode, attr);
 562
 563         if (attr->ia_valid & ATTR_MODE) {
 564                 err = posix_acl_chmod(inode, get_inode_mode(inode));
 565                 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
 566                         inode->i_mode = fi->i_acl_mode;
 567                         clear_inode_flag(fi, FI_ACL_MODE);
 568                 }
 569         }
 570
 571         mark_inode_dirty(inode);
 572         return err;
 573 }
 574
 575 const struct inode_operations f2fs_file_inode_operations = {
 576         .getattr        = f2fs_getattr,
 577         .setattr        = f2fs_setattr,
 578         .get_acl        = f2fs_get_acl,
 579         .set_acl        = f2fs_set_acl,
 580 #ifdef CONFIG_F2FS_FS_XATTR
 581         .setxattr       = generic_setxattr,
 582         .getxattr       = generic_getxattr,
 583         .listxattr      = f2fs_listxattr,
 584         .removexattr    = generic_removexattr,
 585 #endif
 586         .fiemap         = f2fs_fiemap,
 587 };
 588
 589 static void fill_zero(struct inode *inode, pgoff_t index,
 590                                         loff_t start, loff_t len)
 591 {
 592         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 593         struct page *page;
 594
 595         if (!len)
 596                 return;
 597
 598         f2fs_balance_fs(sbi);
 599
 600         f2fs_lock_op(sbi);
 601         page = get_new_data_page(inode, NULL, index, false);
 602         f2fs_unlock_op(sbi);
 603
 604         if (!IS_ERR(page)) {
 605                 f2fs_wait_on_page_writeback(page, DATA);
 606                 zero_user(page, start, len);
 607                 set_page_dirty(page);
 608                 f2fs_put_page(page, 1);
 609         }
 610 }
 611
 612 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
 613 {
 614         pgoff_t index;
 615         int err;
 616
 617         for (index = pg_start; index < pg_end; index++) {
 618                 struct dnode_of_data dn;
 619
 620                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 621                 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
 622                 if (err) {
 623                         if (err == -ENOENT)
 624                                 continue;
 625                         return err;
 626                 }
 627
 628                 if (dn.data_blkaddr != NULL_ADDR)
 629                         truncate_data_blocks_range(&dn, 1);
 630                 f2fs_put_dnode(&dn);
 631         }
 632         return 0;
 633 }
 634
 635 static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
 636 {
 637         pgoff_t pg_start, pg_end;
 638         loff_t off_start, off_end;
 639         int ret = 0;
 640
 641         ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, NULL);
 642         if (ret)
 643                 return ret;
 644
 645         pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
 646         pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
 647
 648         off_start = offset & (PAGE_CACHE_SIZE - 1);
 649         off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
 650
 651         if (pg_start == pg_end) {
 652                 fill_zero(inode, pg_start, off_start,
 653                                                 off_end - off_start);
 654         } else {
 655                 if (off_start)
 656                         fill_zero(inode, pg_start++, off_start,
 657                                         PAGE_CACHE_SIZE - off_start);
 658                 if (off_end)
 659                         fill_zero(inode, pg_end, 0, off_end);
 660
 661                 if (pg_start < pg_end) {
 662                         struct address_space *mapping = inode->i_mapping;
 663                         loff_t blk_start, blk_end;
 664                         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 665
 666                         f2fs_balance_fs(sbi);
 667
 668                         blk_start = pg_start << PAGE_CACHE_SHIFT;
 669                         blk_end = pg_end << PAGE_CACHE_SHIFT;
 670                         truncate_inode_pages_range(mapping, blk_start,
 671                                         blk_end - 1);
 672
 673                         f2fs_lock_op(sbi);
 674                         ret = truncate_hole(inode, pg_start, pg_end);
 675                         f2fs_unlock_op(sbi);
 676                 }
 677         }
 678
 679         return ret;
 680 }
 681
 682 static int expand_inode_data(struct inode *inode, loff_t offset,
 683                                         loff_t len, int mode)
 684 {
 685         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 686         pgoff_t index, pg_start, pg_end;
 687         loff_t new_size = i_size_read(inode);
 688         loff_t off_start, off_end;
 689         int ret = 0;
 690
 691         f2fs_balance_fs(sbi);
 692
 693         ret = inode_newsize_ok(inode, (len + offset));
 694         if (ret)
 695                 return ret;
 696
 697         ret = f2fs_convert_inline_data(inode, offset + len, NULL);
 698         if (ret)
 699                 return ret;
 700
 701         pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
 702         pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
 703
 704         off_start = offset & (PAGE_CACHE_SIZE - 1);
 705         off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
 706
 707         f2fs_lock_op(sbi);
 708
 709         for (index = pg_start; index <= pg_end; index++) {
 710                 struct dnode_of_data dn;
 711
 712                 if (index == pg_end && !off_end)
 713                         goto noalloc;
 714
 715                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 716                 ret = f2fs_reserve_block(&dn, index);
 717                 if (ret)
 718                         break;
 719 noalloc:
 720                 if (pg_start == pg_end)
 721                         new_size = offset + len;
 722                 else if (index == pg_start && off_start)
 723                         new_size = (index + 1) << PAGE_CACHE_SHIFT;
 724                 else if (index == pg_end)
 725                         new_size = (index << PAGE_CACHE_SHIFT) + off_end;
 726                 else
 727                         new_size += PAGE_CACHE_SIZE;
 728         }
 729
 730         if (!(mode & FALLOC_FL_KEEP_SIZE) &&
 731                 i_size_read(inode) < new_size) {
 732                 i_size_write(inode, new_size);
 733                 mark_inode_dirty(inode);
 734                 update_inode_page(inode);
 735         }
 736         f2fs_unlock_op(sbi);
 737
 738         return ret;
 739 }
 740
 741 static long f2fs_fallocate(struct file *file, int mode,
 742                                 loff_t offset, loff_t len)
 743 {
 744         struct inode *inode = file_inode(file);
 745         long ret;
 746
 747         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
 748                 return -EOPNOTSUPP;
 749
 750         mutex_lock(&inode->i_mutex);
 751
 752         if (mode & FALLOC_FL_PUNCH_HOLE)
 753                 ret = punch_hole(inode, offset, len);
 754         else
 755                 ret = expand_inode_data(inode, offset, len, mode);
 756
 757         if (!ret) {
 758                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 759                 mark_inode_dirty(inode);
 760         }
 761
 762         mutex_unlock(&inode->i_mutex);
 763
 764         trace_f2fs_fallocate(inode, mode, offset, len, ret);
 765         return ret;
 766 }
 767
 768 #define F2FS_REG_FLMASK         (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
 769 #define F2FS_OTHER_FLMASK       (FS_NODUMP_FL | FS_NOATIME_FL)
 770
 771 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
 772 {
 773         if (S_ISDIR(mode))
 774                 return flags;
 775         else if (S_ISREG(mode))
 776                 return flags & F2FS_REG_FLMASK;
 777         else
 778                 return flags & F2FS_OTHER_FLMASK;
 779 }
 780
 781 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 782 {
 783         struct inode *inode = file_inode(filp);
 784         struct f2fs_inode_info *fi = F2FS_I(inode);
 785         unsigned int flags;
 786         int ret;
 787
 788         switch (cmd) {
 789         case F2FS_IOC_GETFLAGS:
 790                 flags = fi->i_flags & FS_FL_USER_VISIBLE;
 791                 return put_user(flags, (int __user *) arg);
 792         case F2FS_IOC_SETFLAGS:
 793         {
 794                 unsigned int oldflags;
 795
 796                 ret = mnt_want_write_file(filp);
 797                 if (ret)
 798                         return ret;
 799
 800                 if (!inode_owner_or_capable(inode)) {
 801                         ret = -EACCES;
 802                         goto out;
 803                 }
 804
 805                 if (get_user(flags, (int __user *) arg)) {
 806                         ret = -EFAULT;
 807                         goto out;
 808                 }
 809
 810                 flags = f2fs_mask_flags(inode->i_mode, flags);
 811
 812                 mutex_lock(&inode->i_mutex);
 813
 814                 oldflags = fi->i_flags;
 815
 816                 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
 817                         if (!capable(CAP_LINUX_IMMUTABLE)) {
 818                                 mutex_unlock(&inode->i_mutex);
 819                                 ret = -EPERM;
 820                                 goto out;
 821                         }
 822                 }
 823
 824                 flags = flags & FS_FL_USER_MODIFIABLE;
 825                 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
 826                 fi->i_flags = flags;
 827                 mutex_unlock(&inode->i_mutex);
 828
 829                 f2fs_set_inode_flags(inode);
 830                 inode->i_ctime = CURRENT_TIME;
 831                 mark_inode_dirty(inode);
 832 out:
 833                 mnt_drop_write_file(filp);
 834                 return ret;
 835         }
 836         default:
 837                 return -ENOTTY;
 838         }
 839 }
 840
 841 #ifdef CONFIG_COMPAT
 842 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 843 {
 844         switch (cmd) {
 845         case F2FS_IOC32_GETFLAGS:
 846                 cmd = F2FS_IOC_GETFLAGS;
 847                 break;
 848         case F2FS_IOC32_SETFLAGS:
 849                 cmd = F2FS_IOC_SETFLAGS;
 850                 break;
 851         default:
 852                 return -ENOIOCTLCMD;
 853         }
 854         return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 855 }
 856 #endif
 857
 858 const struct file_operations f2fs_file_operations = {
 859         .llseek         = f2fs_llseek,
 860         .read           = new_sync_read,
 861         .write          = new_sync_write,
 862         .read_iter      = generic_file_read_iter,
 863         .write_iter     = generic_file_write_iter,
 864         .open           = generic_file_open,
 865         .mmap           = f2fs_file_mmap,
 866         .fsync          = f2fs_sync_file,
 867         .fallocate      = f2fs_fallocate,
 868         .unlocked_ioctl = f2fs_ioctl,
 869 #ifdef CONFIG_COMPAT
 870         .compat_ioctl   = f2fs_compat_ioctl,
 871 #endif
 872         .splice_read    = generic_file_splice_read,
 873         .splice_write   = iter_file_splice_write,
 874 };