1 /* 2 * fs/f2fs/file.c 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/fs.h> 12 #include <linux/f2fs_fs.h> 13 #include <linux/stat.h> 14 #include <linux/buffer_head.h> 15 #include <linux/writeback.h> 16 #include <linux/blkdev.h> 17 #include <linux/falloc.h> 18 #include <linux/types.h> 19 #include <linux/compat.h> 20 #include <linux/uaccess.h> 21 #include <linux/mount.h> 22 #include <linux/pagevec.h> 23 24 #include "f2fs.h" 25 #include "node.h" 26 #include "segment.h" 27 #include "xattr.h" 28 #include "acl.h" 29 #include <trace/events/f2fs.h> 30 31 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, 32 struct vm_fault *vmf) 33 { 34 struct page *page = vmf->page; 35 struct inode *inode = file_inode(vma->vm_file); 36 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 37 struct dnode_of_data dn; 38 int err; 39 40 f2fs_balance_fs(sbi); 41 42 sb_start_pagefault(inode->i_sb); 43 44 /* force to convert with normal data indices */ 45 err = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, page); 46 if (err) 47 goto out; 48 49 /* block allocation */ 50 f2fs_lock_op(sbi); 51 set_new_dnode(&dn, inode, NULL, NULL, 0); 52 err = f2fs_reserve_block(&dn, page->index); 53 f2fs_unlock_op(sbi); 54 if (err) 55 goto out; 56 57 file_update_time(vma->vm_file); 58 lock_page(page); 59 if (unlikely(page->mapping != inode->i_mapping || 60 page_offset(page) > i_size_read(inode) || 61 !PageUptodate(page))) { 62 unlock_page(page); 63 err = -EFAULT; 64 goto out; 65 } 66 67 /* 68 * check to see if the page is mapped already (no holes) 69 */ 70 if (PageMappedToDisk(page)) 71 goto mapped; 72 73 /* page is wholly or partially inside EOF */ 74 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) { 75 unsigned offset; 76 offset = i_size_read(inode) & ~PAGE_CACHE_MASK; 77 zero_user_segment(page, offset, PAGE_CACHE_SIZE); 78 } 79 set_page_dirty(page); 80 SetPageUptodate(page); 81 82 trace_f2fs_vm_page_mkwrite(page, DATA); 83 mapped: 84 /* fill the page */ 85 f2fs_wait_on_page_writeback(page, DATA); 86 out: 87 sb_end_pagefault(inode->i_sb); 88 return block_page_mkwrite_return(err); 89 } 90 91 static const struct vm_operations_struct f2fs_file_vm_ops = { 92 .fault = filemap_fault, 93 .map_pages = filemap_map_pages, 94 .page_mkwrite = f2fs_vm_page_mkwrite, 95 .remap_pages = generic_file_remap_pages, 96 }; 97 98 static int get_parent_ino(struct inode *inode, nid_t *pino) 99 { 100 struct dentry *dentry; 101 102 inode = igrab(inode); 103 dentry = d_find_any_alias(inode); 104 iput(inode); 105 if (!dentry) 106 return 0; 107 108 if (update_dent_inode(inode, &dentry->d_name)) { 109 dput(dentry); 110 return 0; 111 } 112 113 *pino = parent_ino(dentry); 114 dput(dentry); 115 return 1; 116 } 117 118 static inline bool need_do_checkpoint(struct inode *inode) 119 { 120 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 121 bool need_cp = false; 122 123 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1) 124 need_cp = true; 125 else if (file_wrong_pino(inode)) 126 need_cp = true; 127 else if (!space_for_roll_forward(sbi)) 128 need_cp = true; 129 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino)) 130 need_cp = true; 131 else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi))) 132 need_cp = true; 133 134 return need_cp; 135 } 136 137 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) 138 { 139 struct inode *inode = file->f_mapping->host; 140 struct f2fs_inode_info *fi = F2FS_I(inode); 141 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 142 int ret = 0; 143 bool need_cp = false; 144 struct writeback_control wbc = { 145 .sync_mode = WB_SYNC_ALL, 146 .nr_to_write = LONG_MAX, 147 .for_reclaim = 0, 148 }; 149 150 if (unlikely(f2fs_readonly(inode->i_sb))) 151 return 0; 152 153 trace_f2fs_sync_file_enter(inode); 154 155 /* if fdatasync is triggered, let's do in-place-update */ 156 if (datasync) 157 set_inode_flag(fi, FI_NEED_IPU); 158 159 ret = filemap_write_and_wait_range(inode->i_mapping, start, end); 160 if (datasync) 161 clear_inode_flag(fi, FI_NEED_IPU); 162 if (ret) { 163 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret); 164 return ret; 165 } 166 167 /* 168 * if there is no written data, don't waste time to write recovery info. 169 */ 170 if (!is_inode_flag_set(fi, FI_APPEND_WRITE) && 171 !exist_written_data(sbi, inode->i_ino, APPEND_INO)) { 172 if (is_inode_flag_set(fi, FI_UPDATE_WRITE) || 173 exist_written_data(sbi, inode->i_ino, UPDATE_INO)) 174 goto flush_out; 175 goto out; 176 } 177 178 /* guarantee free sections for fsync */ 179 f2fs_balance_fs(sbi); 180 181 /* 182 * Both of fdatasync() and fsync() are able to be recovered from 183 * sudden-power-off. 184 */ 185 down_read(&fi->i_sem); 186 need_cp = need_do_checkpoint(inode); 187 up_read(&fi->i_sem); 188 189 if (need_cp) { 190 nid_t pino; 191 192 /* all the dirty node pages should be flushed for POR */ 193 ret = f2fs_sync_fs(inode->i_sb, 1); 194 195 down_write(&fi->i_sem); 196 F2FS_I(inode)->xattr_ver = 0; 197 if (file_wrong_pino(inode) && inode->i_nlink == 1 && 198 get_parent_ino(inode, &pino)) { 199 F2FS_I(inode)->i_pino = pino; 200 file_got_pino(inode); 201 up_write(&fi->i_sem); 202 mark_inode_dirty_sync(inode); 203 ret = f2fs_write_inode(inode, NULL); 204 if (ret) 205 goto out; 206 } else { 207 up_write(&fi->i_sem); 208 } 209 } else { 210 /* if there is no written node page, write its inode page */ 211 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) { 212 if (fsync_mark_done(sbi, inode->i_ino)) 213 goto out; 214 mark_inode_dirty_sync(inode); 215 ret = f2fs_write_inode(inode, NULL); 216 if (ret) 217 goto out; 218 } 219 ret = wait_on_node_pages_writeback(sbi, inode->i_ino); 220 if (ret) 221 goto out; 222 223 /* once recovery info is written, don't need to tack this */ 224 remove_dirty_inode(sbi, inode->i_ino, APPEND_INO); 225 clear_inode_flag(fi, FI_APPEND_WRITE); 226 flush_out: 227 remove_dirty_inode(sbi, inode->i_ino, UPDATE_INO); 228 clear_inode_flag(fi, FI_UPDATE_WRITE); 229 ret = f2fs_issue_flush(F2FS_SB(inode->i_sb)); 230 } 231 out: 232 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret); 233 return ret; 234 } 235 236 static pgoff_t __get_first_dirty_index(struct address_space *mapping, 237 pgoff_t pgofs, int whence) 238 { 239 struct pagevec pvec; 240 int nr_pages; 241 242 if (whence != SEEK_DATA) 243 return 0; 244 245 /* find first dirty page index */ 246 pagevec_init(&pvec, 0); 247 nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs, 248 PAGECACHE_TAG_DIRTY, 1); 249 pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX; 250 pagevec_release(&pvec); 251 return pgofs; 252 } 253 254 static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs, 255 int whence) 256 { 257 switch (whence) { 258 case SEEK_DATA: 259 if ((blkaddr == NEW_ADDR && dirty == pgofs) || 260 (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR)) 261 return true; 262 break; 263 case SEEK_HOLE: 264 if (blkaddr == NULL_ADDR) 265 return true; 266 break; 267 } 268 return false; 269 } 270 271 static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence) 272 { 273 struct inode *inode = file->f_mapping->host; 274 loff_t maxbytes = inode->i_sb->s_maxbytes; 275 struct dnode_of_data dn; 276 pgoff_t pgofs, end_offset, dirty; 277 loff_t data_ofs = offset; 278 loff_t isize; 279 int err = 0; 280 281 mutex_lock(&inode->i_mutex); 282 283 isize = i_size_read(inode); 284 if (offset >= isize) 285 goto fail; 286 287 /* handle inline data case */ 288 if (f2fs_has_inline_data(inode)) { 289 if (whence == SEEK_HOLE) 290 data_ofs = isize; 291 goto found; 292 } 293 294 pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT); 295 296 dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence); 297 298 for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) { 299 set_new_dnode(&dn, inode, NULL, NULL, 0); 300 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); 301 if (err && err != -ENOENT) { 302 goto fail; 303 } else if (err == -ENOENT) { 304 /* direct node does not exists */ 305 if (whence == SEEK_DATA) { 306 pgofs = PGOFS_OF_NEXT_DNODE(pgofs, 307 F2FS_I(inode)); 308 continue; 309 } else { 310 goto found; 311 } 312 } 313 314 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); 315 316 /* find data/hole in dnode block */ 317 for (; dn.ofs_in_node < end_offset; 318 dn.ofs_in_node++, pgofs++, 319 data_ofs = pgofs << PAGE_CACHE_SHIFT) { 320 block_t blkaddr; 321 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); 322 323 if (__found_offset(blkaddr, dirty, pgofs, whence)) { 324 f2fs_put_dnode(&dn); 325 goto found; 326 } 327 } 328 f2fs_put_dnode(&dn); 329 } 330 331 if (whence == SEEK_DATA) 332 goto fail; 333 found: 334 if (whence == SEEK_HOLE && data_ofs > isize) 335 data_ofs = isize; 336 mutex_unlock(&inode->i_mutex); 337 return vfs_setpos(file, data_ofs, maxbytes); 338 fail: 339 mutex_unlock(&inode->i_mutex); 340 return -ENXIO; 341 } 342 343 static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence) 344 { 345 struct inode *inode = file->f_mapping->host; 346 loff_t maxbytes = inode->i_sb->s_maxbytes; 347 348 switch (whence) { 349 case SEEK_SET: 350 case SEEK_CUR: 351 case SEEK_END: 352 return generic_file_llseek_size(file, offset, whence, 353 maxbytes, i_size_read(inode)); 354 case SEEK_DATA: 355 case SEEK_HOLE: 356 return f2fs_seek_block(file, offset, whence); 357 } 358 359 return -EINVAL; 360 } 361 362 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) 363 { 364 file_accessed(file); 365 vma->vm_ops = &f2fs_file_vm_ops; 366 return 0; 367 } 368 369 int truncate_data_blocks_range(struct dnode_of_data *dn, int count) 370 { 371 int nr_free = 0, ofs = dn->ofs_in_node; 372 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); 373 struct f2fs_node *raw_node; 374 __le32 *addr; 375 376 raw_node = F2FS_NODE(dn->node_page); 377 addr = blkaddr_in_node(raw_node) + ofs; 378 379 for (; count > 0; count--, addr++, dn->ofs_in_node++) { 380 block_t blkaddr = le32_to_cpu(*addr); 381 if (blkaddr == NULL_ADDR) 382 continue; 383 384 update_extent_cache(NULL_ADDR, dn); 385 invalidate_blocks(sbi, blkaddr); 386 nr_free++; 387 } 388 if (nr_free) { 389 dec_valid_block_count(sbi, dn->inode, nr_free); 390 set_page_dirty(dn->node_page); 391 sync_inode_page(dn); 392 } 393 dn->ofs_in_node = ofs; 394 395 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid, 396 dn->ofs_in_node, nr_free); 397 return nr_free; 398 } 399 400 void truncate_data_blocks(struct dnode_of_data *dn) 401 { 402 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK); 403 } 404 405 static void truncate_partial_data_page(struct inode *inode, u64 from) 406 { 407 unsigned offset = from & (PAGE_CACHE_SIZE - 1); 408 struct page *page; 409 410 if (f2fs_has_inline_data(inode)) 411 return truncate_inline_data(inode, from); 412 413 if (!offset) 414 return; 415 416 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false); 417 if (IS_ERR(page)) 418 return; 419 420 lock_page(page); 421 if (unlikely(!PageUptodate(page) || 422 page->mapping != inode->i_mapping)) 423 goto out; 424 425 f2fs_wait_on_page_writeback(page, DATA); 426 zero_user(page, offset, PAGE_CACHE_SIZE - offset); 427 set_page_dirty(page); 428 429 out: 430 f2fs_put_page(page, 1); 431 } 432 433 int truncate_blocks(struct inode *inode, u64 from, bool lock) 434 { 435 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 436 unsigned int blocksize = inode->i_sb->s_blocksize; 437 struct dnode_of_data dn; 438 pgoff_t free_from; 439 int count = 0, err = 0; 440 441 trace_f2fs_truncate_blocks_enter(inode, from); 442 443 if (f2fs_has_inline_data(inode)) 444 goto done; 445 446 free_from = (pgoff_t) 447 ((from + blocksize - 1) >> (sbi->log_blocksize)); 448 449 if (lock) 450 f2fs_lock_op(sbi); 451 452 set_new_dnode(&dn, inode, NULL, NULL, 0); 453 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE); 454 if (err) { 455 if (err == -ENOENT) 456 goto free_next; 457 if (lock) 458 f2fs_unlock_op(sbi); 459 trace_f2fs_truncate_blocks_exit(inode, err); 460 return err; 461 } 462 463 count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); 464 465 count -= dn.ofs_in_node; 466 f2fs_bug_on(count < 0); 467 468 if (dn.ofs_in_node || IS_INODE(dn.node_page)) { 469 truncate_data_blocks_range(&dn, count); 470 free_from += count; 471 } 472 473 f2fs_put_dnode(&dn); 474 free_next: 475 err = truncate_inode_blocks(inode, free_from); 476 if (lock) 477 f2fs_unlock_op(sbi); 478 done: 479 /* lastly zero out the first data page */ 480 truncate_partial_data_page(inode, from); 481 482 trace_f2fs_truncate_blocks_exit(inode, err); 483 return err; 484 } 485 486 void f2fs_truncate(struct inode *inode) 487 { 488 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || 489 S_ISLNK(inode->i_mode))) 490 return; 491 492 trace_f2fs_truncate(inode); 493 494 if (!truncate_blocks(inode, i_size_read(inode), true)) { 495 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 496 mark_inode_dirty(inode); 497 } 498 } 499 500 int f2fs_getattr(struct vfsmount *mnt, 501 struct dentry *dentry, struct kstat *stat) 502 { 503 struct inode *inode = dentry->d_inode; 504 generic_fillattr(inode, stat); 505 stat->blocks <<= 3; 506 return 0; 507 } 508 509 #ifdef CONFIG_F2FS_FS_POSIX_ACL 510 static void __setattr_copy(struct inode *inode, const struct iattr *attr) 511 { 512 struct f2fs_inode_info *fi = F2FS_I(inode); 513 unsigned int ia_valid = attr->ia_valid; 514 515 if (ia_valid & ATTR_UID) 516 inode->i_uid = attr->ia_uid; 517 if (ia_valid & ATTR_GID) 518 inode->i_gid = attr->ia_gid; 519 if (ia_valid & ATTR_ATIME) 520 inode->i_atime = timespec_trunc(attr->ia_atime, 521 inode->i_sb->s_time_gran); 522 if (ia_valid & ATTR_MTIME) 523 inode->i_mtime = timespec_trunc(attr->ia_mtime, 524 inode->i_sb->s_time_gran); 525 if (ia_valid & ATTR_CTIME) 526 inode->i_ctime = timespec_trunc(attr->ia_ctime, 527 inode->i_sb->s_time_gran); 528 if (ia_valid & ATTR_MODE) { 529 umode_t mode = attr->ia_mode; 530 531 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) 532 mode &= ~S_ISGID; 533 set_acl_inode(fi, mode); 534 } 535 } 536 #else 537 #define __setattr_copy setattr_copy 538 #endif 539 540 int f2fs_setattr(struct dentry *dentry, struct iattr *attr) 541 { 542 struct inode *inode = dentry->d_inode; 543 struct f2fs_inode_info *fi = F2FS_I(inode); 544 int err; 545 546 err = inode_change_ok(inode, attr); 547 if (err) 548 return err; 549 550 if ((attr->ia_valid & ATTR_SIZE) && 551 attr->ia_size != i_size_read(inode)) { 552 err = f2fs_convert_inline_data(inode, attr->ia_size, NULL); 553 if (err) 554 return err; 555 556 truncate_setsize(inode, attr->ia_size); 557 f2fs_truncate(inode); 558 f2fs_balance_fs(F2FS_SB(inode->i_sb)); 559 } 560 561 __setattr_copy(inode, attr); 562 563 if (attr->ia_valid & ATTR_MODE) { 564 err = posix_acl_chmod(inode, get_inode_mode(inode)); 565 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) { 566 inode->i_mode = fi->i_acl_mode; 567 clear_inode_flag(fi, FI_ACL_MODE); 568 } 569 } 570 571 mark_inode_dirty(inode); 572 return err; 573 } 574 575 const struct inode_operations f2fs_file_inode_operations = { 576 .getattr = f2fs_getattr, 577 .setattr = f2fs_setattr, 578 .get_acl = f2fs_get_acl, 579 .set_acl = f2fs_set_acl, 580 #ifdef CONFIG_F2FS_FS_XATTR 581 .setxattr = generic_setxattr, 582 .getxattr = generic_getxattr, 583 .listxattr = f2fs_listxattr, 584 .removexattr = generic_removexattr, 585 #endif 586 .fiemap = f2fs_fiemap, 587 }; 588 589 static void fill_zero(struct inode *inode, pgoff_t index, 590 loff_t start, loff_t len) 591 { 592 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 593 struct page *page; 594 595 if (!len) 596 return; 597 598 f2fs_balance_fs(sbi); 599 600 f2fs_lock_op(sbi); 601 page = get_new_data_page(inode, NULL, index, false); 602 f2fs_unlock_op(sbi); 603 604 if (!IS_ERR(page)) { 605 f2fs_wait_on_page_writeback(page, DATA); 606 zero_user(page, start, len); 607 set_page_dirty(page); 608 f2fs_put_page(page, 1); 609 } 610 } 611 612 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end) 613 { 614 pgoff_t index; 615 int err; 616 617 for (index = pg_start; index < pg_end; index++) { 618 struct dnode_of_data dn; 619 620 set_new_dnode(&dn, inode, NULL, NULL, 0); 621 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 622 if (err) { 623 if (err == -ENOENT) 624 continue; 625 return err; 626 } 627 628 if (dn.data_blkaddr != NULL_ADDR) 629 truncate_data_blocks_range(&dn, 1); 630 f2fs_put_dnode(&dn); 631 } 632 return 0; 633 } 634 635 static int punch_hole(struct inode *inode, loff_t offset, loff_t len) 636 { 637 pgoff_t pg_start, pg_end; 638 loff_t off_start, off_end; 639 int ret = 0; 640 641 ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, NULL); 642 if (ret) 643 return ret; 644 645 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; 646 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; 647 648 off_start = offset & (PAGE_CACHE_SIZE - 1); 649 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); 650 651 if (pg_start == pg_end) { 652 fill_zero(inode, pg_start, off_start, 653 off_end - off_start); 654 } else { 655 if (off_start) 656 fill_zero(inode, pg_start++, off_start, 657 PAGE_CACHE_SIZE - off_start); 658 if (off_end) 659 fill_zero(inode, pg_end, 0, off_end); 660 661 if (pg_start < pg_end) { 662 struct address_space *mapping = inode->i_mapping; 663 loff_t blk_start, blk_end; 664 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 665 666 f2fs_balance_fs(sbi); 667 668 blk_start = pg_start << PAGE_CACHE_SHIFT; 669 blk_end = pg_end << PAGE_CACHE_SHIFT; 670 truncate_inode_pages_range(mapping, blk_start, 671 blk_end - 1); 672 673 f2fs_lock_op(sbi); 674 ret = truncate_hole(inode, pg_start, pg_end); 675 f2fs_unlock_op(sbi); 676 } 677 } 678 679 return ret; 680 } 681 682 static int expand_inode_data(struct inode *inode, loff_t offset, 683 loff_t len, int mode) 684 { 685 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 686 pgoff_t index, pg_start, pg_end; 687 loff_t new_size = i_size_read(inode); 688 loff_t off_start, off_end; 689 int ret = 0; 690 691 f2fs_balance_fs(sbi); 692 693 ret = inode_newsize_ok(inode, (len + offset)); 694 if (ret) 695 return ret; 696 697 ret = f2fs_convert_inline_data(inode, offset + len, NULL); 698 if (ret) 699 return ret; 700 701 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; 702 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; 703 704 off_start = offset & (PAGE_CACHE_SIZE - 1); 705 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); 706 707 f2fs_lock_op(sbi); 708 709 for (index = pg_start; index <= pg_end; index++) { 710 struct dnode_of_data dn; 711 712 if (index == pg_end && !off_end) 713 goto noalloc; 714 715 set_new_dnode(&dn, inode, NULL, NULL, 0); 716 ret = f2fs_reserve_block(&dn, index); 717 if (ret) 718 break; 719 noalloc: 720 if (pg_start == pg_end) 721 new_size = offset + len; 722 else if (index == pg_start && off_start) 723 new_size = (index + 1) << PAGE_CACHE_SHIFT; 724 else if (index == pg_end) 725 new_size = (index << PAGE_CACHE_SHIFT) + off_end; 726 else 727 new_size += PAGE_CACHE_SIZE; 728 } 729 730 if (!(mode & FALLOC_FL_KEEP_SIZE) && 731 i_size_read(inode) < new_size) { 732 i_size_write(inode, new_size); 733 mark_inode_dirty(inode); 734 update_inode_page(inode); 735 } 736 f2fs_unlock_op(sbi); 737 738 return ret; 739 } 740 741 static long f2fs_fallocate(struct file *file, int mode, 742 loff_t offset, loff_t len) 743 { 744 struct inode *inode = file_inode(file); 745 long ret; 746 747 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 748 return -EOPNOTSUPP; 749 750 mutex_lock(&inode->i_mutex); 751 752 if (mode & FALLOC_FL_PUNCH_HOLE) 753 ret = punch_hole(inode, offset, len); 754 else 755 ret = expand_inode_data(inode, offset, len, mode); 756 757 if (!ret) { 758 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 759 mark_inode_dirty(inode); 760 } 761 762 mutex_unlock(&inode->i_mutex); 763 764 trace_f2fs_fallocate(inode, mode, offset, len, ret); 765 return ret; 766 } 767 768 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL)) 769 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL) 770 771 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags) 772 { 773 if (S_ISDIR(mode)) 774 return flags; 775 else if (S_ISREG(mode)) 776 return flags & F2FS_REG_FLMASK; 777 else 778 return flags & F2FS_OTHER_FLMASK; 779 } 780 781 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 782 { 783 struct inode *inode = file_inode(filp); 784 struct f2fs_inode_info *fi = F2FS_I(inode); 785 unsigned int flags; 786 int ret; 787 788 switch (cmd) { 789 case F2FS_IOC_GETFLAGS: 790 flags = fi->i_flags & FS_FL_USER_VISIBLE; 791 return put_user(flags, (int __user *) arg); 792 case F2FS_IOC_SETFLAGS: 793 { 794 unsigned int oldflags; 795 796 ret = mnt_want_write_file(filp); 797 if (ret) 798 return ret; 799 800 if (!inode_owner_or_capable(inode)) { 801 ret = -EACCES; 802 goto out; 803 } 804 805 if (get_user(flags, (int __user *) arg)) { 806 ret = -EFAULT; 807 goto out; 808 } 809 810 flags = f2fs_mask_flags(inode->i_mode, flags); 811 812 mutex_lock(&inode->i_mutex); 813 814 oldflags = fi->i_flags; 815 816 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 817 if (!capable(CAP_LINUX_IMMUTABLE)) { 818 mutex_unlock(&inode->i_mutex); 819 ret = -EPERM; 820 goto out; 821 } 822 } 823 824 flags = flags & FS_FL_USER_MODIFIABLE; 825 flags |= oldflags & ~FS_FL_USER_MODIFIABLE; 826 fi->i_flags = flags; 827 mutex_unlock(&inode->i_mutex); 828 829 f2fs_set_inode_flags(inode); 830 inode->i_ctime = CURRENT_TIME; 831 mark_inode_dirty(inode); 832 out: 833 mnt_drop_write_file(filp); 834 return ret; 835 } 836 default: 837 return -ENOTTY; 838 } 839 } 840 841 #ifdef CONFIG_COMPAT 842 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 843 { 844 switch (cmd) { 845 case F2FS_IOC32_GETFLAGS: 846 cmd = F2FS_IOC_GETFLAGS; 847 break; 848 case F2FS_IOC32_SETFLAGS: 849 cmd = F2FS_IOC_SETFLAGS; 850 break; 851 default: 852 return -ENOIOCTLCMD; 853 } 854 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 855 } 856 #endif 857 858 const struct file_operations f2fs_file_operations = { 859 .llseek = f2fs_llseek, 860 .read = new_sync_read, 861 .write = new_sync_write, 862 .read_iter = generic_file_read_iter, 863 .write_iter = generic_file_write_iter, 864 .open = generic_file_open, 865 .mmap = f2fs_file_mmap, 866 .fsync = f2fs_sync_file, 867 .fallocate = f2fs_fallocate, 868 .unlocked_ioctl = f2fs_ioctl, 869 #ifdef CONFIG_COMPAT 870 .compat_ioctl = f2fs_compat_ioctl, 871 #endif 872 .splice_read = generic_file_splice_read, 873 .splice_write = iter_file_splice_write, 874 }; 875