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