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