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