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_I_SB(inode);
  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_I_SB(inode);
 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_I_SB(inode);
 142         nid_t ino = inode->i_ino;
 143         int ret = 0;
 144         bool need_cp = false;
 145         struct writeback_control wbc = {
 146                 .sync_mode = WB_SYNC_ALL,
 147                 .nr_to_write = LONG_MAX,
 148                 .for_reclaim = 0,
 149         };
 150
 151         if (unlikely(f2fs_readonly(inode->i_sb)))
 152                 return 0;
 153
 154         trace_f2fs_sync_file_enter(inode);
 155
 156         /* if fdatasync is triggered, let's do in-place-update */
 157         if (datasync)
 158                 set_inode_flag(fi, FI_NEED_IPU);
 159
 160         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 161         if (datasync)
 162                 clear_inode_flag(fi, FI_NEED_IPU);
 163         if (ret) {
 164                 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 165                 return ret;
 166         }
 167
 168         /*
 169          * if there is no written data, don't waste time to write recovery info.
 170          */
 171         if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
 172                         !exist_written_data(sbi, ino, APPEND_INO)) {
 173                 if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
 174                                 exist_written_data(sbi, ino, UPDATE_INO))
 175                         goto flush_out;
 176                 goto out;
 177         }
 178
 179         /* guarantee free sections for fsync */
 180         f2fs_balance_fs(sbi);
 181
 182         /*
 183          * Both of fdatasync() and fsync() are able to be recovered from
 184          * sudden-power-off.
 185          */
 186         down_read(&fi->i_sem);
 187         need_cp = need_do_checkpoint(inode);
 188         up_read(&fi->i_sem);
 189
 190         if (need_cp) {
 191                 nid_t pino;
 192
 193                 /* all the dirty node pages should be flushed for POR */
 194                 ret = f2fs_sync_fs(inode->i_sb, 1);
 195
 196                 down_write(&fi->i_sem);
 197                 F2FS_I(inode)->xattr_ver = 0;
 198                 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
 199                                         get_parent_ino(inode, &pino)) {
 200                         F2FS_I(inode)->i_pino = pino;
 201                         file_got_pino(inode);
 202                         up_write(&fi->i_sem);
 203                         mark_inode_dirty_sync(inode);
 204                         ret = f2fs_write_inode(inode, NULL);
 205                         if (ret)
 206                                 goto out;
 207                 } else {
 208                         up_write(&fi->i_sem);
 209                 }
 210         } else {
 211                 /* if there is no written node page, write its inode page */
 212                 while (!sync_node_pages(sbi, ino, &wbc)) {
 213                         if (fsync_mark_done(sbi, ino))
 214                                 goto out;
 215                         mark_inode_dirty_sync(inode);
 216                         ret = f2fs_write_inode(inode, NULL);
 217                         if (ret)
 218                                 goto out;
 219                 }
 220                 ret = wait_on_node_pages_writeback(sbi, ino);
 221                 if (ret)
 222                         goto out;
 223
 224                 /* once recovery info is written, don't need to tack this */
 225                 remove_dirty_inode(sbi, ino, APPEND_INO);
 226                 clear_inode_flag(fi, FI_APPEND_WRITE);
 227 flush_out:
 228                 remove_dirty_inode(sbi, ino, UPDATE_INO);
 229                 clear_inode_flag(fi, FI_UPDATE_WRITE);
 230                 ret = f2fs_issue_flush(F2FS_I_SB(inode));
 231         }
 232 out:
 233         trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 234         return ret;
 235 }
 236
 237 static pgoff_t __get_first_dirty_index(struct address_space *mapping,
 238                                                 pgoff_t pgofs, int whence)
 239 {
 240         struct pagevec pvec;
 241         int nr_pages;
 242
 243         if (whence != SEEK_DATA)
 244                 return 0;
 245
 246         /* find first dirty page index */
 247         pagevec_init(&pvec, 0);
 248         nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
 249                                         PAGECACHE_TAG_DIRTY, 1);
 250         pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
 251         pagevec_release(&pvec);
 252         return pgofs;
 253 }
 254
 255 static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
 256                                                         int whence)
 257 {
 258         switch (whence) {
 259         case SEEK_DATA:
 260                 if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
 261                         (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
 262                         return true;
 263                 break;
 264         case SEEK_HOLE:
 265                 if (blkaddr == NULL_ADDR)
 266                         return true;
 267                 break;
 268         }
 269         return false;
 270 }
 271
 272 static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 273 {
 274         struct inode *inode = file->f_mapping->host;
 275         loff_t maxbytes = inode->i_sb->s_maxbytes;
 276         struct dnode_of_data dn;
 277         pgoff_t pgofs, end_offset, dirty;
 278         loff_t data_ofs = offset;
 279         loff_t isize;
 280         int err = 0;
 281
 282         mutex_lock(&inode->i_mutex);
 283
 284         isize = i_size_read(inode);
 285         if (offset >= isize)
 286                 goto fail;
 287
 288         /* handle inline data case */
 289         if (f2fs_has_inline_data(inode)) {
 290                 if (whence == SEEK_HOLE)
 291                         data_ofs = isize;
 292                 goto found;
 293         }
 294
 295         pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);
 296
 297         dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
 298
 299         for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) {
 300                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 301                 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
 302                 if (err && err != -ENOENT) {
 303                         goto fail;
 304                 } else if (err == -ENOENT) {
 305                         /* direct node does not exists */
 306                         if (whence == SEEK_DATA) {
 307                                 pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
 308                                                         F2FS_I(inode));
 309                                 continue;
 310                         } else {
 311                                 goto found;
 312                         }
 313                 }
 314
 315                 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 316
 317                 /* find data/hole in dnode block */
 318                 for (; dn.ofs_in_node < end_offset;
 319                                 dn.ofs_in_node++, pgofs++,
 320                                 data_ofs = pgofs << PAGE_CACHE_SHIFT) {
 321                         block_t blkaddr;
 322                         blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
 323
 324                         if (__found_offset(blkaddr, dirty, pgofs, whence)) {
 325                                 f2fs_put_dnode(&dn);
 326                                 goto found;
 327                         }
 328                 }
 329                 f2fs_put_dnode(&dn);
 330         }
 331
 332         if (whence == SEEK_DATA)
 333                 goto fail;
 334 found:
 335         if (whence == SEEK_HOLE && data_ofs > isize)
 336                 data_ofs = isize;
 337         mutex_unlock(&inode->i_mutex);
 338         return vfs_setpos(file, data_ofs, maxbytes);
 339 fail:
 340         mutex_unlock(&inode->i_mutex);
 341         return -ENXIO;
 342 }
 343
 344 static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
 345 {
 346         struct inode *inode = file->f_mapping->host;
 347         loff_t maxbytes = inode->i_sb->s_maxbytes;
 348
 349         switch (whence) {
 350         case SEEK_SET:
 351         case SEEK_CUR:
 352         case SEEK_END:
 353                 return generic_file_llseek_size(file, offset, whence,
 354                                                 maxbytes, i_size_read(inode));
 355         case SEEK_DATA:
 356         case SEEK_HOLE:
 357                 if (offset < 0)
 358                         return -ENXIO;
 359                 return f2fs_seek_block(file, offset, whence);
 360         }
 361
 362         return -EINVAL;
 363 }
 364
 365 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 366 {
 367         file_accessed(file);
 368         vma->vm_ops = &f2fs_file_vm_ops;
 369         return 0;
 370 }
 371
 372 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
 373 {
 374         int nr_free = 0, ofs = dn->ofs_in_node;
 375         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 376         struct f2fs_node *raw_node;
 377         __le32 *addr;
 378
 379         raw_node = F2FS_NODE(dn->node_page);
 380         addr = blkaddr_in_node(raw_node) + ofs;
 381
 382         for (; count > 0; count--, addr++, dn->ofs_in_node++) {
 383                 block_t blkaddr = le32_to_cpu(*addr);
 384                 if (blkaddr == NULL_ADDR)
 385                         continue;
 386
 387                 update_extent_cache(NULL_ADDR, dn);
 388                 invalidate_blocks(sbi, blkaddr);
 389                 nr_free++;
 390         }
 391         if (nr_free) {
 392                 dec_valid_block_count(sbi, dn->inode, nr_free);
 393                 set_page_dirty(dn->node_page);
 394                 sync_inode_page(dn);
 395         }
 396         dn->ofs_in_node = ofs;
 397
 398         trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
 399                                          dn->ofs_in_node, nr_free);
 400         return nr_free;
 401 }
 402
 403 void truncate_data_blocks(struct dnode_of_data *dn)
 404 {
 405         truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
 406 }
 407
 408 static void truncate_partial_data_page(struct inode *inode, u64 from)
 409 {
 410         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
 411         struct page *page;
 412
 413         if (f2fs_has_inline_data(inode))
 414                 return truncate_inline_data(inode, from);
 415
 416         if (!offset)
 417                 return;
 418
 419         page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
 420         if (IS_ERR(page))
 421                 return;
 422
 423         lock_page(page);
 424         if (unlikely(!PageUptodate(page) ||
 425                         page->mapping != inode->i_mapping))
 426                 goto out;
 427
 428         f2fs_wait_on_page_writeback(page, DATA);
 429         zero_user(page, offset, PAGE_CACHE_SIZE - offset);
 430         set_page_dirty(page);
 431
 432 out:
 433         f2fs_put_page(page, 1);
 434 }
 435
 436 int truncate_blocks(struct inode *inode, u64 from, bool lock)
 437 {
 438         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 439         unsigned int blocksize = inode->i_sb->s_blocksize;
 440         struct dnode_of_data dn;
 441         pgoff_t free_from;
 442         int count = 0, err = 0;
 443
 444         trace_f2fs_truncate_blocks_enter(inode, from);
 445
 446         if (f2fs_has_inline_data(inode))
 447                 goto done;
 448
 449         free_from = (pgoff_t)
 450                         ((from + blocksize - 1) >> (sbi->log_blocksize));
 451
 452         if (lock)
 453                 f2fs_lock_op(sbi);
 454
 455         set_new_dnode(&dn, inode, NULL, NULL, 0);
 456         err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
 457         if (err) {
 458                 if (err == -ENOENT)
 459                         goto free_next;
 460                 if (lock)
 461                         f2fs_unlock_op(sbi);
 462                 trace_f2fs_truncate_blocks_exit(inode, err);
 463                 return err;
 464         }
 465
 466         count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 467
 468         count -= dn.ofs_in_node;
 469         f2fs_bug_on(sbi, count < 0);
 470
 471         if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
 472                 truncate_data_blocks_range(&dn, count);
 473                 free_from += count;
 474         }
 475
 476         f2fs_put_dnode(&dn);
 477 free_next:
 478         err = truncate_inode_blocks(inode, free_from);
 479         if (lock)
 480                 f2fs_unlock_op(sbi);
 481 done:
 482         /* lastly zero out the first data page */
 483         truncate_partial_data_page(inode, from);
 484
 485         trace_f2fs_truncate_blocks_exit(inode, err);
 486         return err;
 487 }
 488
 489 void f2fs_truncate(struct inode *inode)
 490 {
 491         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 492                                 S_ISLNK(inode->i_mode)))
 493                 return;
 494
 495         trace_f2fs_truncate(inode);
 496
 497         if (!truncate_blocks(inode, i_size_read(inode), true)) {
 498                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 499                 mark_inode_dirty(inode);
 500         }
 501 }
 502
 503 int f2fs_getattr(struct vfsmount *mnt,
 504                          struct dentry *dentry, struct kstat *stat)
 505 {
 506         struct inode *inode = dentry->d_inode;
 507         generic_fillattr(inode, stat);
 508         stat->blocks <<= 3;
 509         return 0;
 510 }
 511
 512 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 513 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
 514 {
 515         struct f2fs_inode_info *fi = F2FS_I(inode);
 516         unsigned int ia_valid = attr->ia_valid;
 517
 518         if (ia_valid & ATTR_UID)
 519                 inode->i_uid = attr->ia_uid;
 520         if (ia_valid & ATTR_GID)
 521                 inode->i_gid = attr->ia_gid;
 522         if (ia_valid & ATTR_ATIME)
 523                 inode->i_atime = timespec_trunc(attr->ia_atime,
 524                                                 inode->i_sb->s_time_gran);
 525         if (ia_valid & ATTR_MTIME)
 526                 inode->i_mtime = timespec_trunc(attr->ia_mtime,
 527                                                 inode->i_sb->s_time_gran);
 528         if (ia_valid & ATTR_CTIME)
 529                 inode->i_ctime = timespec_trunc(attr->ia_ctime,
 530                                                 inode->i_sb->s_time_gran);
 531         if (ia_valid & ATTR_MODE) {
 532                 umode_t mode = attr->ia_mode;
 533
 534                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 535                         mode &= ~S_ISGID;
 536                 set_acl_inode(fi, mode);
 537         }
 538 }
 539 #else
 540 #define __setattr_copy setattr_copy
 541 #endif
 542
 543 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 544 {
 545         struct inode *inode = dentry->d_inode;
 546         struct f2fs_inode_info *fi = F2FS_I(inode);
 547         int err;
 548
 549         err = inode_change_ok(inode, attr);
 550         if (err)
 551                 return err;
 552
 553         if ((attr->ia_valid & ATTR_SIZE) &&
 554                         attr->ia_size != i_size_read(inode)) {
 555                 err = f2fs_convert_inline_data(inode, attr->ia_size, NULL);
 556                 if (err)
 557                         return err;
 558
 559                 truncate_setsize(inode, attr->ia_size);
 560                 f2fs_truncate(inode);
 561                 f2fs_balance_fs(F2FS_I_SB(inode));
 562         }
 563
 564         __setattr_copy(inode, attr);
 565
 566         if (attr->ia_valid & ATTR_MODE) {
 567                 err = posix_acl_chmod(inode, get_inode_mode(inode));
 568                 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
 569                         inode->i_mode = fi->i_acl_mode;
 570                         clear_inode_flag(fi, FI_ACL_MODE);
 571                 }
 572         }
 573
 574         mark_inode_dirty(inode);
 575         return err;
 576 }
 577
 578 const struct inode_operations f2fs_file_inode_operations = {
 579         .getattr        = f2fs_getattr,
 580         .setattr        = f2fs_setattr,
 581         .get_acl        = f2fs_get_acl,
 582         .set_acl        = f2fs_set_acl,
 583 #ifdef CONFIG_F2FS_FS_XATTR
 584         .setxattr       = generic_setxattr,
 585         .getxattr       = generic_getxattr,
 586         .listxattr      = f2fs_listxattr,
 587         .removexattr    = generic_removexattr,
 588 #endif
 589         .fiemap         = f2fs_fiemap,
 590 };
 591
 592 static void fill_zero(struct inode *inode, pgoff_t index,
 593                                         loff_t start, loff_t len)
 594 {
 595         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 596         struct page *page;
 597
 598         if (!len)
 599                 return;
 600
 601         f2fs_balance_fs(sbi);
 602
 603         f2fs_lock_op(sbi);
 604         page = get_new_data_page(inode, NULL, index, false);
 605         f2fs_unlock_op(sbi);
 606
 607         if (!IS_ERR(page)) {
 608                 f2fs_wait_on_page_writeback(page, DATA);
 609                 zero_user(page, start, len);
 610                 set_page_dirty(page);
 611                 f2fs_put_page(page, 1);
 612         }
 613 }
 614
 615 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
 616 {
 617         pgoff_t index;
 618         int err;
 619
 620         for (index = pg_start; index < pg_end; index++) {
 621                 struct dnode_of_data dn;
 622
 623                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 624                 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
 625                 if (err) {
 626                         if (err == -ENOENT)
 627                                 continue;
 628                         return err;
 629                 }
 630
 631                 if (dn.data_blkaddr != NULL_ADDR)
 632                         truncate_data_blocks_range(&dn, 1);
 633                 f2fs_put_dnode(&dn);
 634         }
 635         return 0;
 636 }
 637
 638 static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
 639 {
 640         pgoff_t pg_start, pg_end;
 641         loff_t off_start, off_end;
 642         int ret = 0;
 643
 644         ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, NULL);
 645         if (ret)
 646                 return ret;
 647
 648         pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
 649         pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
 650
 651         off_start = offset & (PAGE_CACHE_SIZE - 1);
 652         off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
 653
 654         if (pg_start == pg_end) {
 655                 fill_zero(inode, pg_start, off_start,
 656                                                 off_end - off_start);
 657         } else {
 658                 if (off_start)
 659                         fill_zero(inode, pg_start++, off_start,
 660                                         PAGE_CACHE_SIZE - off_start);
 661                 if (off_end)
 662                         fill_zero(inode, pg_end, 0, off_end);
 663
 664                 if (pg_start < pg_end) {
 665                         struct address_space *mapping = inode->i_mapping;
 666                         loff_t blk_start, blk_end;
 667                         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 668
 669                         f2fs_balance_fs(sbi);
 670
 671                         blk_start = pg_start << PAGE_CACHE_SHIFT;
 672                         blk_end = pg_end << PAGE_CACHE_SHIFT;
 673                         truncate_inode_pages_range(mapping, blk_start,
 674                                         blk_end - 1);
 675
 676                         f2fs_lock_op(sbi);
 677                         ret = truncate_hole(inode, pg_start, pg_end);
 678                         f2fs_unlock_op(sbi);
 679                 }
 680         }
 681
 682         return ret;
 683 }
 684
 685 static int expand_inode_data(struct inode *inode, loff_t offset,
 686                                         loff_t len, int mode)
 687 {
 688         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 689         pgoff_t index, pg_start, pg_end;
 690         loff_t new_size = i_size_read(inode);
 691         loff_t off_start, off_end;
 692         int ret = 0;
 693
 694         f2fs_balance_fs(sbi);
 695
 696         ret = inode_newsize_ok(inode, (len + offset));
 697         if (ret)
 698                 return ret;
 699
 700         ret = f2fs_convert_inline_data(inode, offset + len, NULL);
 701         if (ret)
 702                 return ret;
 703
 704         pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
 705         pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
 706
 707         off_start = offset & (PAGE_CACHE_SIZE - 1);
 708         off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
 709
 710         f2fs_lock_op(sbi);
 711
 712         for (index = pg_start; index <= pg_end; index++) {
 713                 struct dnode_of_data dn;
 714
 715                 if (index == pg_end && !off_end)
 716                         goto noalloc;
 717
 718                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 719                 ret = f2fs_reserve_block(&dn, index);
 720                 if (ret)
 721                         break;
 722 noalloc:
 723                 if (pg_start == pg_end)
 724                         new_size = offset + len;
 725                 else if (index == pg_start && off_start)
 726                         new_size = (index + 1) << PAGE_CACHE_SHIFT;
 727                 else if (index == pg_end)
 728                         new_size = (index << PAGE_CACHE_SHIFT) + off_end;
 729                 else
 730                         new_size += PAGE_CACHE_SIZE;
 731         }
 732
 733         if (!(mode & FALLOC_FL_KEEP_SIZE) &&
 734                 i_size_read(inode) < new_size) {
 735                 i_size_write(inode, new_size);
 736                 mark_inode_dirty(inode);
 737                 update_inode_page(inode);
 738         }
 739         f2fs_unlock_op(sbi);
 740
 741         return ret;
 742 }
 743
 744 static long f2fs_fallocate(struct file *file, int mode,
 745                                 loff_t offset, loff_t len)
 746 {
 747         struct inode *inode = file_inode(file);
 748         long ret;
 749
 750         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
 751                 return -EOPNOTSUPP;
 752
 753         mutex_lock(&inode->i_mutex);
 754
 755         if (mode & FALLOC_FL_PUNCH_HOLE)
 756                 ret = punch_hole(inode, offset, len);
 757         else
 758                 ret = expand_inode_data(inode, offset, len, mode);
 759
 760         if (!ret) {
 761                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 762                 mark_inode_dirty(inode);
 763         }
 764
 765         mutex_unlock(&inode->i_mutex);
 766
 767         trace_f2fs_fallocate(inode, mode, offset, len, ret);
 768         return ret;
 769 }
 770
 771 #define F2FS_REG_FLMASK         (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
 772 #define F2FS_OTHER_FLMASK       (FS_NODUMP_FL | FS_NOATIME_FL)
 773
 774 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
 775 {
 776         if (S_ISDIR(mode))
 777                 return flags;
 778         else if (S_ISREG(mode))
 779                 return flags & F2FS_REG_FLMASK;
 780         else
 781                 return flags & F2FS_OTHER_FLMASK;
 782 }
 783
 784 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 785 {
 786         struct inode *inode = file_inode(filp);
 787         struct f2fs_inode_info *fi = F2FS_I(inode);
 788         unsigned int flags;
 789         int ret;
 790
 791         switch (cmd) {
 792         case F2FS_IOC_GETFLAGS:
 793                 flags = fi->i_flags & FS_FL_USER_VISIBLE;
 794                 return put_user(flags, (int __user *) arg);
 795         case F2FS_IOC_SETFLAGS:
 796         {
 797                 unsigned int oldflags;
 798
 799                 ret = mnt_want_write_file(filp);
 800                 if (ret)
 801                         return ret;
 802
 803                 if (!inode_owner_or_capable(inode)) {
 804                         ret = -EACCES;
 805                         goto out;
 806                 }
 807
 808                 if (get_user(flags, (int __user *) arg)) {
 809                         ret = -EFAULT;
 810                         goto out;
 811                 }
 812
 813                 flags = f2fs_mask_flags(inode->i_mode, flags);
 814
 815                 mutex_lock(&inode->i_mutex);
 816
 817                 oldflags = fi->i_flags;
 818
 819                 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
 820                         if (!capable(CAP_LINUX_IMMUTABLE)) {
 821                                 mutex_unlock(&inode->i_mutex);
 822                                 ret = -EPERM;
 823                                 goto out;
 824                         }
 825                 }
 826
 827                 flags = flags & FS_FL_USER_MODIFIABLE;
 828                 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
 829                 fi->i_flags = flags;
 830                 mutex_unlock(&inode->i_mutex);
 831
 832                 f2fs_set_inode_flags(inode);
 833                 inode->i_ctime = CURRENT_TIME;
 834                 mark_inode_dirty(inode);
 835 out:
 836                 mnt_drop_write_file(filp);
 837                 return ret;
 838         }
 839         default:
 840                 return -ENOTTY;
 841         }
 842 }
 843
 844 #ifdef CONFIG_COMPAT
 845 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 846 {
 847         switch (cmd) {
 848         case F2FS_IOC32_GETFLAGS:
 849                 cmd = F2FS_IOC_GETFLAGS;
 850                 break;
 851         case F2FS_IOC32_SETFLAGS:
 852                 cmd = F2FS_IOC_SETFLAGS;
 853                 break;
 854         default:
 855                 return -ENOIOCTLCMD;
 856         }
 857         return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 858 }
 859 #endif
 860
 861 const struct file_operations f2fs_file_operations = {
 862         .llseek         = f2fs_llseek,
 863         .read           = new_sync_read,
 864         .write          = new_sync_write,
 865         .read_iter      = generic_file_read_iter,
 866         .write_iter     = generic_file_write_iter,
 867         .open           = generic_file_open,
 868         .mmap           = f2fs_file_mmap,
 869         .fsync          = f2fs_sync_file,
 870         .fallocate      = f2fs_fallocate,
 871         .unlocked_ioctl = f2fs_ioctl,
 872 #ifdef CONFIG_COMPAT
 873         .compat_ioctl   = f2fs_compat_ioctl,
 874 #endif
 875         .splice_read    = generic_file_splice_read,
 876         .splice_write   = iter_file_splice_write,
 877 };