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
  23 #include "f2fs.h"
  24 #include "node.h"
  25 #include "segment.h"
  26 #include "xattr.h"
  27 #include "acl.h"
  28 #include <trace/events/f2fs.h>
  29
  30 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
  31                                                 struct vm_fault *vmf)
  32 {
  33         struct page *page = vmf->page;
  34         struct inode *inode = file_inode(vma->vm_file);
  35         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  36         block_t old_blk_addr;
  37         struct dnode_of_data dn;
  38         int err, ilock;
  39
  40         f2fs_balance_fs(sbi);
  41
  42         sb_start_pagefault(inode->i_sb);
  43
  44         /* block allocation */
  45         ilock = mutex_lock_op(sbi);
  46         set_new_dnode(&dn, inode, NULL, NULL, 0);
  47         err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
  48         if (err) {
  49                 mutex_unlock_op(sbi, ilock);
  50                 goto out;
  51         }
  52
  53         old_blk_addr = dn.data_blkaddr;
  54
  55         if (old_blk_addr == NULL_ADDR) {
  56                 err = reserve_new_block(&dn);
  57                 if (err) {
  58                         f2fs_put_dnode(&dn);
  59                         mutex_unlock_op(sbi, ilock);
  60                         goto out;
  61                 }
  62         }
  63         f2fs_put_dnode(&dn);
  64         mutex_unlock_op(sbi, ilock);
  65
  66         file_update_time(vma->vm_file);
  67         lock_page(page);
  68         if (page->mapping != inode->i_mapping ||
  69                         page_offset(page) > i_size_read(inode) ||
  70                         !PageUptodate(page)) {
  71                 unlock_page(page);
  72                 err = -EFAULT;
  73                 goto out;
  74         }
  75
  76         /*
  77          * check to see if the page is mapped already (no holes)
  78          */
  79         if (PageMappedToDisk(page))
  80                 goto mapped;
  81
  82         /* page is wholly or partially inside EOF */
  83         if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
  84                 unsigned offset;
  85                 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
  86                 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
  87         }
  88         set_page_dirty(page);
  89         SetPageUptodate(page);
  90
  91 mapped:
  92         /* fill the page */
  93         wait_on_page_writeback(page);
  94 out:
  95         sb_end_pagefault(inode->i_sb);
  96         return block_page_mkwrite_return(err);
  97 }
  98
  99 static const struct vm_operations_struct f2fs_file_vm_ops = {
 100         .fault          = filemap_fault,
 101         .page_mkwrite   = f2fs_vm_page_mkwrite,
 102         .remap_pages    = generic_file_remap_pages,
 103 };
 104
 105 static int get_parent_ino(struct inode *inode, nid_t *pino)
 106 {
 107         struct dentry *dentry;
 108
 109         inode = igrab(inode);
 110         dentry = d_find_any_alias(inode);
 111         iput(inode);
 112         if (!dentry)
 113                 return 0;
 114
 115         inode = igrab(dentry->d_parent->d_inode);
 116         dput(dentry);
 117
 118         *pino = inode->i_ino;
 119         iput(inode);
 120         return 1;
 121 }
 122
 123 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 124 {
 125         struct inode *inode = file->f_mapping->host;
 126         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 127         int ret = 0;
 128         bool need_cp = false;
 129         struct writeback_control wbc = {
 130                 .sync_mode = WB_SYNC_ALL,
 131                 .nr_to_write = LONG_MAX,
 132                 .for_reclaim = 0,
 133         };
 134
 135         if (f2fs_readonly(inode->i_sb))
 136                 return 0;
 137
 138         trace_f2fs_sync_file_enter(inode);
 139         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 140         if (ret) {
 141                 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 142                 return ret;
 143         }
 144
 145         /* guarantee free sections for fsync */
 146         f2fs_balance_fs(sbi);
 147
 148         mutex_lock(&inode->i_mutex);
 149
 150         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
 151                 goto out;
 152
 153         if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
 154                 need_cp = true;
 155         else if (file_wrong_pino(inode))
 156                 need_cp = true;
 157         else if (!space_for_roll_forward(sbi))
 158                 need_cp = true;
 159         else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
 160                 need_cp = true;
 161
 162         if (need_cp) {
 163                 nid_t pino;
 164
 165                 /* all the dirty node pages should be flushed for POR */
 166                 ret = f2fs_sync_fs(inode->i_sb, 1);
 167                 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
 168                                         get_parent_ino(inode, &pino)) {
 169                         F2FS_I(inode)->i_pino = pino;
 170                         file_got_pino(inode);
 171                         mark_inode_dirty_sync(inode);
 172                         ret = f2fs_write_inode(inode, NULL);
 173                         if (ret)
 174                                 goto out;
 175                 }
 176         } else {
 177                 /* if there is no written node page, write its inode page */
 178                 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
 179                         mark_inode_dirty_sync(inode);
 180                         ret = f2fs_write_inode(inode, NULL);
 181                         if (ret)
 182                                 goto out;
 183                 }
 184                 filemap_fdatawait_range(sbi->node_inode->i_mapping,
 185                                                         0, LONG_MAX);
 186                 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 187         }
 188 out:
 189         mutex_unlock(&inode->i_mutex);
 190         trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 191         return ret;
 192 }
 193
 194 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 195 {
 196         file_accessed(file);
 197         vma->vm_ops = &f2fs_file_vm_ops;
 198         return 0;
 199 }
 200
 201 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
 202 {
 203         int nr_free = 0, ofs = dn->ofs_in_node;
 204         struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
 205         struct f2fs_node *raw_node;
 206         __le32 *addr;
 207
 208         raw_node = page_address(dn->node_page);
 209         addr = blkaddr_in_node(raw_node) + ofs;
 210
 211         for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
 212                 block_t blkaddr = le32_to_cpu(*addr);
 213                 if (blkaddr == NULL_ADDR)
 214                         continue;
 215
 216                 update_extent_cache(NULL_ADDR, dn);
 217                 invalidate_blocks(sbi, blkaddr);
 218                 nr_free++;
 219         }
 220         if (nr_free) {
 221                 dec_valid_block_count(sbi, dn->inode, nr_free);
 222                 set_page_dirty(dn->node_page);
 223                 sync_inode_page(dn);
 224         }
 225         dn->ofs_in_node = ofs;
 226
 227         trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
 228                                          dn->ofs_in_node, nr_free);
 229         return nr_free;
 230 }
 231
 232 void truncate_data_blocks(struct dnode_of_data *dn)
 233 {
 234         truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
 235 }
 236
 237 static void truncate_partial_data_page(struct inode *inode, u64 from)
 238 {
 239         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
 240         struct page *page;
 241
 242         if (!offset)
 243                 return;
 244
 245         page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
 246         if (IS_ERR(page))
 247                 return;
 248
 249         lock_page(page);
 250         if (page->mapping != inode->i_mapping) {
 251                 f2fs_put_page(page, 1);
 252                 return;
 253         }
 254         wait_on_page_writeback(page);
 255         zero_user(page, offset, PAGE_CACHE_SIZE - offset);
 256         set_page_dirty(page);
 257         f2fs_put_page(page, 1);
 258 }
 259
 260 static int truncate_blocks(struct inode *inode, u64 from)
 261 {
 262         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 263         unsigned int blocksize = inode->i_sb->s_blocksize;
 264         struct dnode_of_data dn;
 265         pgoff_t free_from;
 266         int count = 0, ilock = -1;
 267         int err;
 268
 269         trace_f2fs_truncate_blocks_enter(inode, from);
 270
 271         free_from = (pgoff_t)
 272                         ((from + blocksize - 1) >> (sbi->log_blocksize));
 273
 274         ilock = mutex_lock_op(sbi);
 275         set_new_dnode(&dn, inode, NULL, NULL, 0);
 276         err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
 277         if (err) {
 278                 if (err == -ENOENT)
 279                         goto free_next;
 280                 mutex_unlock_op(sbi, ilock);
 281                 trace_f2fs_truncate_blocks_exit(inode, err);
 282                 return err;
 283         }
 284
 285         if (IS_INODE(dn.node_page))
 286                 count = ADDRS_PER_INODE;
 287         else
 288                 count = ADDRS_PER_BLOCK;
 289
 290         count -= dn.ofs_in_node;
 291         BUG_ON(count < 0);
 292
 293         if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
 294                 truncate_data_blocks_range(&dn, count);
 295                 free_from += count;
 296         }
 297
 298         f2fs_put_dnode(&dn);
 299 free_next:
 300         err = truncate_inode_blocks(inode, free_from);
 301         mutex_unlock_op(sbi, ilock);
 302
 303         /* lastly zero out the first data page */
 304         truncate_partial_data_page(inode, from);
 305
 306         trace_f2fs_truncate_blocks_exit(inode, err);
 307         return err;
 308 }
 309
 310 void f2fs_truncate(struct inode *inode)
 311 {
 312         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 313                                 S_ISLNK(inode->i_mode)))
 314                 return;
 315
 316         trace_f2fs_truncate(inode);
 317
 318         if (!truncate_blocks(inode, i_size_read(inode))) {
 319                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 320                 mark_inode_dirty(inode);
 321         }
 322 }
 323
 324 int f2fs_getattr(struct vfsmount *mnt,
 325                          struct dentry *dentry, struct kstat *stat)
 326 {
 327         struct inode *inode = dentry->d_inode;
 328         generic_fillattr(inode, stat);
 329         stat->blocks <<= 3;
 330         return 0;
 331 }
 332
 333 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 334 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
 335 {
 336         struct f2fs_inode_info *fi = F2FS_I(inode);
 337         unsigned int ia_valid = attr->ia_valid;
 338
 339         if (ia_valid & ATTR_UID)
 340                 inode->i_uid = attr->ia_uid;
 341         if (ia_valid & ATTR_GID)
 342                 inode->i_gid = attr->ia_gid;
 343         if (ia_valid & ATTR_ATIME)
 344                 inode->i_atime = timespec_trunc(attr->ia_atime,
 345                                                 inode->i_sb->s_time_gran);
 346         if (ia_valid & ATTR_MTIME)
 347                 inode->i_mtime = timespec_trunc(attr->ia_mtime,
 348                                                 inode->i_sb->s_time_gran);
 349         if (ia_valid & ATTR_CTIME)
 350                 inode->i_ctime = timespec_trunc(attr->ia_ctime,
 351                                                 inode->i_sb->s_time_gran);
 352         if (ia_valid & ATTR_MODE) {
 353                 umode_t mode = attr->ia_mode;
 354
 355                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 356                         mode &= ~S_ISGID;
 357                 set_acl_inode(fi, mode);
 358         }
 359 }
 360 #else
 361 #define __setattr_copy setattr_copy
 362 #endif
 363
 364 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 365 {
 366         struct inode *inode = dentry->d_inode;
 367         struct f2fs_inode_info *fi = F2FS_I(inode);
 368         int err;
 369
 370         err = inode_change_ok(inode, attr);
 371         if (err)
 372                 return err;
 373
 374         if ((attr->ia_valid & ATTR_SIZE) &&
 375                         attr->ia_size != i_size_read(inode)) {
 376                 truncate_setsize(inode, attr->ia_size);
 377                 f2fs_truncate(inode);
 378                 f2fs_balance_fs(F2FS_SB(inode->i_sb));
 379         }
 380
 381         __setattr_copy(inode, attr);
 382
 383         if (attr->ia_valid & ATTR_MODE) {
 384                 err = f2fs_acl_chmod(inode);
 385                 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
 386                         inode->i_mode = fi->i_acl_mode;
 387                         clear_inode_flag(fi, FI_ACL_MODE);
 388                 }
 389         }
 390
 391         mark_inode_dirty(inode);
 392         return err;
 393 }
 394
 395 const struct inode_operations f2fs_file_inode_operations = {
 396         .getattr        = f2fs_getattr,
 397         .setattr        = f2fs_setattr,
 398         .get_acl        = f2fs_get_acl,
 399 #ifdef CONFIG_F2FS_FS_XATTR
 400         .setxattr       = generic_setxattr,
 401         .getxattr       = generic_getxattr,
 402         .listxattr      = f2fs_listxattr,
 403         .removexattr    = generic_removexattr,
 404 #endif
 405 };
 406
 407 static void fill_zero(struct inode *inode, pgoff_t index,
 408                                         loff_t start, loff_t len)
 409 {
 410         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 411         struct page *page;
 412         int ilock;
 413
 414         if (!len)
 415                 return;
 416
 417         f2fs_balance_fs(sbi);
 418
 419         ilock = mutex_lock_op(sbi);
 420         page = get_new_data_page(inode, NULL, index, false);
 421         mutex_unlock_op(sbi, ilock);
 422
 423         if (!IS_ERR(page)) {
 424                 wait_on_page_writeback(page);
 425                 zero_user(page, start, len);
 426                 set_page_dirty(page);
 427                 f2fs_put_page(page, 1);
 428         }
 429 }
 430
 431 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
 432 {
 433         pgoff_t index;
 434         int err;
 435
 436         for (index = pg_start; index < pg_end; index++) {
 437                 struct dnode_of_data dn;
 438
 439                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 440                 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
 441                 if (err) {
 442                         if (err == -ENOENT)
 443                                 continue;
 444                         return err;
 445                 }
 446
 447                 if (dn.data_blkaddr != NULL_ADDR)
 448                         truncate_data_blocks_range(&dn, 1);
 449                 f2fs_put_dnode(&dn);
 450         }
 451         return 0;
 452 }
 453
 454 static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
 455 {
 456         pgoff_t pg_start, pg_end;
 457         loff_t off_start, off_end;
 458         int ret = 0;
 459
 460         pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
 461         pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
 462
 463         off_start = offset & (PAGE_CACHE_SIZE - 1);
 464         off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
 465
 466         if (pg_start == pg_end) {
 467                 fill_zero(inode, pg_start, off_start,
 468                                                 off_end - off_start);
 469         } else {
 470                 if (off_start)
 471                         fill_zero(inode, pg_start++, off_start,
 472                                         PAGE_CACHE_SIZE - off_start);
 473                 if (off_end)
 474                         fill_zero(inode, pg_end, 0, off_end);
 475
 476                 if (pg_start < pg_end) {
 477                         struct address_space *mapping = inode->i_mapping;
 478                         loff_t blk_start, blk_end;
 479                         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 480                         int ilock;
 481
 482                         f2fs_balance_fs(sbi);
 483
 484                         blk_start = pg_start << PAGE_CACHE_SHIFT;
 485                         blk_end = pg_end << PAGE_CACHE_SHIFT;
 486                         truncate_inode_pages_range(mapping, blk_start,
 487                                         blk_end - 1);
 488
 489                         ilock = mutex_lock_op(sbi);
 490                         ret = truncate_hole(inode, pg_start, pg_end);
 491                         mutex_unlock_op(sbi, ilock);
 492                 }
 493         }
 494
 495         if (!(mode & FALLOC_FL_KEEP_SIZE) &&
 496                 i_size_read(inode) <= (offset + len)) {
 497                 i_size_write(inode, offset);
 498                 mark_inode_dirty(inode);
 499         }
 500
 501         return ret;
 502 }
 503
 504 static int expand_inode_data(struct inode *inode, loff_t offset,
 505                                         loff_t len, int mode)
 506 {
 507         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 508         pgoff_t index, pg_start, pg_end;
 509         loff_t new_size = i_size_read(inode);
 510         loff_t off_start, off_end;
 511         int ret = 0;
 512
 513         ret = inode_newsize_ok(inode, (len + offset));
 514         if (ret)
 515                 return ret;
 516
 517         pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
 518         pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
 519
 520         off_start = offset & (PAGE_CACHE_SIZE - 1);
 521         off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
 522
 523         for (index = pg_start; index <= pg_end; index++) {
 524                 struct dnode_of_data dn;
 525                 int ilock;
 526
 527                 ilock = mutex_lock_op(sbi);
 528                 set_new_dnode(&dn, inode, NULL, NULL, 0);
 529                 ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
 530                 if (ret) {
 531                         mutex_unlock_op(sbi, ilock);
 532                         break;
 533                 }
 534
 535                 if (dn.data_blkaddr == NULL_ADDR) {
 536                         ret = reserve_new_block(&dn);
 537                         if (ret) {
 538                                 f2fs_put_dnode(&dn);
 539                                 mutex_unlock_op(sbi, ilock);
 540                                 break;
 541                         }
 542                 }
 543                 f2fs_put_dnode(&dn);
 544                 mutex_unlock_op(sbi, ilock);
 545
 546                 if (pg_start == pg_end)
 547                         new_size = offset + len;
 548                 else if (index == pg_start && off_start)
 549                         new_size = (index + 1) << PAGE_CACHE_SHIFT;
 550                 else if (index == pg_end)
 551                         new_size = (index << PAGE_CACHE_SHIFT) + off_end;
 552                 else
 553                         new_size += PAGE_CACHE_SIZE;
 554         }
 555
 556         if (!(mode & FALLOC_FL_KEEP_SIZE) &&
 557                 i_size_read(inode) < new_size) {
 558                 i_size_write(inode, new_size);
 559                 mark_inode_dirty(inode);
 560         }
 561
 562         return ret;
 563 }
 564
 565 static long f2fs_fallocate(struct file *file, int mode,
 566                                 loff_t offset, loff_t len)
 567 {
 568         struct inode *inode = file_inode(file);
 569         long ret;
 570
 571         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
 572                 return -EOPNOTSUPP;
 573
 574         if (mode & FALLOC_FL_PUNCH_HOLE)
 575                 ret = punch_hole(inode, offset, len, mode);
 576         else
 577                 ret = expand_inode_data(inode, offset, len, mode);
 578
 579         if (!ret) {
 580                 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 581                 mark_inode_dirty(inode);
 582         }
 583         trace_f2fs_fallocate(inode, mode, offset, len, ret);
 584         return ret;
 585 }
 586
 587 #define F2FS_REG_FLMASK         (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
 588 #define F2FS_OTHER_FLMASK       (FS_NODUMP_FL | FS_NOATIME_FL)
 589
 590 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
 591 {
 592         if (S_ISDIR(mode))
 593                 return flags;
 594         else if (S_ISREG(mode))
 595                 return flags & F2FS_REG_FLMASK;
 596         else
 597                 return flags & F2FS_OTHER_FLMASK;
 598 }
 599
 600 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 601 {
 602         struct inode *inode = file_inode(filp);
 603         struct f2fs_inode_info *fi = F2FS_I(inode);
 604         unsigned int flags;
 605         int ret;
 606
 607         switch (cmd) {
 608         case F2FS_IOC_GETFLAGS:
 609                 flags = fi->i_flags & FS_FL_USER_VISIBLE;
 610                 return put_user(flags, (int __user *) arg);
 611         case F2FS_IOC_SETFLAGS:
 612         {
 613                 unsigned int oldflags;
 614
 615                 ret = mnt_want_write_file(filp);
 616                 if (ret)
 617                         return ret;
 618
 619                 if (!inode_owner_or_capable(inode)) {
 620                         ret = -EACCES;
 621                         goto out;
 622                 }
 623
 624                 if (get_user(flags, (int __user *) arg)) {
 625                         ret = -EFAULT;
 626                         goto out;
 627                 }
 628
 629                 flags = f2fs_mask_flags(inode->i_mode, flags);
 630
 631                 mutex_lock(&inode->i_mutex);
 632
 633                 oldflags = fi->i_flags;
 634
 635                 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
 636                         if (!capable(CAP_LINUX_IMMUTABLE)) {
 637                                 mutex_unlock(&inode->i_mutex);
 638                                 ret = -EPERM;
 639                                 goto out;
 640                         }
 641                 }
 642
 643                 flags = flags & FS_FL_USER_MODIFIABLE;
 644                 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
 645                 fi->i_flags = flags;
 646                 mutex_unlock(&inode->i_mutex);
 647
 648                 f2fs_set_inode_flags(inode);
 649                 inode->i_ctime = CURRENT_TIME;
 650                 mark_inode_dirty(inode);
 651 out:
 652                 mnt_drop_write_file(filp);
 653                 return ret;
 654         }
 655         default:
 656                 return -ENOTTY;
 657         }
 658 }
 659
 660 #ifdef CONFIG_COMPAT
 661 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 662 {
 663         switch (cmd) {
 664         case F2FS_IOC32_GETFLAGS:
 665                 cmd = F2FS_IOC_GETFLAGS;
 666                 break;
 667         case F2FS_IOC32_SETFLAGS:
 668                 cmd = F2FS_IOC_SETFLAGS;
 669                 break;
 670         default:
 671                 return -ENOIOCTLCMD;
 672         }
 673         return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 674 }
 675 #endif
 676
 677 const struct file_operations f2fs_file_operations = {
 678         .llseek         = generic_file_llseek,
 679         .read           = do_sync_read,
 680         .write          = do_sync_write,
 681         .aio_read       = generic_file_aio_read,
 682         .aio_write      = generic_file_aio_write,
 683         .open           = generic_file_open,
 684         .mmap           = f2fs_file_mmap,
 685         .fsync          = f2fs_sync_file,
 686         .fallocate      = f2fs_fallocate,
 687         .unlocked_ioctl = f2fs_ioctl,
 688 #ifdef CONFIG_COMPAT
 689         .compat_ioctl   = f2fs_compat_ioctl,
 690 #endif
 691         .splice_read    = generic_file_splice_read,
 692         .splice_write   = generic_file_splice_write,
 693 };