4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
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.
12 #include <linux/f2fs_fs.h>
13 #include <linux/buffer_head.h>
14 #include <linux/mpage.h>
15 #include <linux/aio.h>
16 #include <linux/writeback.h>
17 #include <linux/backing-dev.h>
18 #include <linux/blkdev.h>
19 #include <linux/bio.h>
20 #include <linux/prefetch.h>
25 #include <trace/events/f2fs.h>
27 static void f2fs_read_end_io(struct bio *bio, int err)
32 bio_for_each_segment_all(bvec, bio, i) {
33 struct page *page = bvec->bv_page;
36 SetPageUptodate(page);
38 ClearPageUptodate(page);
46 static void f2fs_write_end_io(struct bio *bio, int err)
48 struct f2fs_sb_info *sbi = bio->bi_private;
52 bio_for_each_segment_all(bvec, bio, i) {
53 struct page *page = bvec->bv_page;
57 set_bit(AS_EIO, &page->mapping->flags);
58 f2fs_stop_checkpoint(sbi);
60 end_page_writeback(page);
61 dec_page_count(sbi, F2FS_WRITEBACK);
64 if (!get_pages(sbi, F2FS_WRITEBACK) &&
65 !list_empty(&sbi->cp_wait.task_list))
66 wake_up(&sbi->cp_wait);
72 * Low-level block read/write IO operations.
74 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
75 int npages, bool is_read)
79 /* No failure on bio allocation */
80 bio = bio_alloc(GFP_NOIO, npages);
82 bio->bi_bdev = sbi->sb->s_bdev;
83 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
84 bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
85 bio->bi_private = sbi;
90 static void __submit_merged_bio(struct f2fs_bio_info *io)
92 struct f2fs_io_info *fio = &io->fio;
97 if (is_read_io(fio->rw))
98 trace_f2fs_submit_read_bio(io->sbi->sb, fio->rw,
101 trace_f2fs_submit_write_bio(io->sbi->sb, fio->rw,
104 submit_bio(fio->rw, io->bio);
108 void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
109 enum page_type type, int rw)
111 enum page_type btype = PAGE_TYPE_OF_BIO(type);
112 struct f2fs_bio_info *io;
114 io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
116 down_write(&io->io_rwsem);
118 /* change META to META_FLUSH in the checkpoint procedure */
119 if (type >= META_FLUSH) {
120 io->fio.type = META_FLUSH;
121 if (test_opt(sbi, NOBARRIER))
122 io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO;
124 io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
126 __submit_merged_bio(io);
127 up_write(&io->io_rwsem);
131 * Fill the locked page with data located in the block address.
132 * Return unlocked page.
134 int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page,
135 block_t blk_addr, int rw)
139 trace_f2fs_submit_page_bio(page, blk_addr, rw);
141 /* Allocate a new bio */
142 bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw));
144 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
146 f2fs_put_page(page, 1);
154 void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
155 block_t blk_addr, struct f2fs_io_info *fio)
157 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
158 struct f2fs_bio_info *io;
159 bool is_read = is_read_io(fio->rw);
161 io = is_read ? &sbi->read_io : &sbi->write_io[btype];
163 verify_block_addr(sbi, blk_addr);
165 down_write(&io->io_rwsem);
168 inc_page_count(sbi, F2FS_WRITEBACK);
170 if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
171 io->fio.rw != fio->rw))
172 __submit_merged_bio(io);
174 if (io->bio == NULL) {
175 int bio_blocks = MAX_BIO_BLOCKS(sbi);
177 io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read);
181 if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
183 __submit_merged_bio(io);
187 io->last_block_in_bio = blk_addr;
189 up_write(&io->io_rwsem);
190 trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr);
194 * Lock ordering for the change of data block address:
197 * update block addresses in the node page
199 static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr)
201 struct f2fs_node *rn;
203 struct page *node_page = dn->node_page;
204 unsigned int ofs_in_node = dn->ofs_in_node;
206 f2fs_wait_on_page_writeback(node_page, NODE);
208 rn = F2FS_NODE(node_page);
210 /* Get physical address of data block */
211 addr_array = blkaddr_in_node(rn);
212 addr_array[ofs_in_node] = cpu_to_le32(new_addr);
213 set_page_dirty(node_page);
216 int reserve_new_block(struct dnode_of_data *dn)
218 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
220 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
222 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
225 trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
227 __set_data_blkaddr(dn, NEW_ADDR);
228 dn->data_blkaddr = NEW_ADDR;
229 mark_inode_dirty(dn->inode);
234 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
236 bool need_put = dn->inode_page ? false : true;
239 err = get_dnode_of_data(dn, index, ALLOC_NODE);
243 if (dn->data_blkaddr == NULL_ADDR)
244 err = reserve_new_block(dn);
250 static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
251 struct buffer_head *bh_result)
253 struct f2fs_inode_info *fi = F2FS_I(inode);
254 pgoff_t start_fofs, end_fofs;
255 block_t start_blkaddr;
257 if (is_inode_flag_set(fi, FI_NO_EXTENT))
260 read_lock(&fi->ext.ext_lock);
261 if (fi->ext.len == 0) {
262 read_unlock(&fi->ext.ext_lock);
266 stat_inc_total_hit(inode->i_sb);
268 start_fofs = fi->ext.fofs;
269 end_fofs = fi->ext.fofs + fi->ext.len - 1;
270 start_blkaddr = fi->ext.blk_addr;
272 if (pgofs >= start_fofs && pgofs <= end_fofs) {
273 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
276 clear_buffer_new(bh_result);
277 map_bh(bh_result, inode->i_sb,
278 start_blkaddr + pgofs - start_fofs);
279 count = end_fofs - pgofs + 1;
280 if (count < (UINT_MAX >> blkbits))
281 bh_result->b_size = (count << blkbits);
283 bh_result->b_size = UINT_MAX;
285 stat_inc_read_hit(inode->i_sb);
286 read_unlock(&fi->ext.ext_lock);
289 read_unlock(&fi->ext.ext_lock);
293 void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
295 struct f2fs_inode_info *fi = F2FS_I(dn->inode);
296 pgoff_t fofs, start_fofs, end_fofs;
297 block_t start_blkaddr, end_blkaddr;
298 int need_update = true;
300 f2fs_bug_on(F2FS_I_SB(dn->inode), blk_addr == NEW_ADDR);
301 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
304 /* Update the page address in the parent node */
305 __set_data_blkaddr(dn, blk_addr);
307 if (is_inode_flag_set(fi, FI_NO_EXTENT))
310 write_lock(&fi->ext.ext_lock);
312 start_fofs = fi->ext.fofs;
313 end_fofs = fi->ext.fofs + fi->ext.len - 1;
314 start_blkaddr = fi->ext.blk_addr;
315 end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1;
317 /* Drop and initialize the matched extent */
318 if (fi->ext.len == 1 && fofs == start_fofs)
322 if (fi->ext.len == 0) {
323 if (blk_addr != NULL_ADDR) {
325 fi->ext.blk_addr = blk_addr;
332 if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) {
340 if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) {
345 /* Split the existing extent */
346 if (fi->ext.len > 1 &&
347 fofs >= start_fofs && fofs <= end_fofs) {
348 if ((end_fofs - fofs) < (fi->ext.len >> 1)) {
349 fi->ext.len = fofs - start_fofs;
351 fi->ext.fofs = fofs + 1;
352 fi->ext.blk_addr = start_blkaddr +
353 fofs - start_fofs + 1;
354 fi->ext.len -= fofs - start_fofs + 1;
360 /* Finally, if the extent is very fragmented, let's drop the cache. */
361 if (fi->ext.len < F2FS_MIN_EXTENT_LEN) {
363 set_inode_flag(fi, FI_NO_EXTENT);
367 write_unlock(&fi->ext.ext_lock);
373 struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
375 struct address_space *mapping = inode->i_mapping;
376 struct dnode_of_data dn;
380 page = find_get_page(mapping, index);
381 if (page && PageUptodate(page))
383 f2fs_put_page(page, 0);
385 set_new_dnode(&dn, inode, NULL, NULL, 0);
386 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
391 if (dn.data_blkaddr == NULL_ADDR)
392 return ERR_PTR(-ENOENT);
394 /* By fallocate(), there is no cached page, but with NEW_ADDR */
395 if (unlikely(dn.data_blkaddr == NEW_ADDR))
396 return ERR_PTR(-EINVAL);
398 page = grab_cache_page(mapping, index);
400 return ERR_PTR(-ENOMEM);
402 if (PageUptodate(page)) {
407 err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, dn.data_blkaddr,
408 sync ? READ_SYNC : READA);
413 wait_on_page_locked(page);
414 if (unlikely(!PageUptodate(page))) {
415 f2fs_put_page(page, 0);
416 return ERR_PTR(-EIO);
423 * If it tries to access a hole, return an error.
424 * Because, the callers, functions in dir.c and GC, should be able to know
425 * whether this page exists or not.
427 struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
429 struct address_space *mapping = inode->i_mapping;
430 struct dnode_of_data dn;
435 page = grab_cache_page(mapping, index);
437 return ERR_PTR(-ENOMEM);
439 set_new_dnode(&dn, inode, NULL, NULL, 0);
440 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
442 f2fs_put_page(page, 1);
447 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
448 f2fs_put_page(page, 1);
449 return ERR_PTR(-ENOENT);
452 if (PageUptodate(page))
456 * A new dentry page is allocated but not able to be written, since its
457 * new inode page couldn't be allocated due to -ENOSPC.
458 * In such the case, its blkaddr can be remained as NEW_ADDR.
459 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
461 if (dn.data_blkaddr == NEW_ADDR) {
462 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
463 SetPageUptodate(page);
467 err = f2fs_submit_page_bio(F2FS_I_SB(inode), page,
468 dn.data_blkaddr, READ_SYNC);
473 if (unlikely(!PageUptodate(page))) {
474 f2fs_put_page(page, 1);
475 return ERR_PTR(-EIO);
477 if (unlikely(page->mapping != mapping)) {
478 f2fs_put_page(page, 1);
485 * Caller ensures that this data page is never allocated.
486 * A new zero-filled data page is allocated in the page cache.
488 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
490 * Note that, ipage is set only by make_empty_dir.
492 struct page *get_new_data_page(struct inode *inode,
493 struct page *ipage, pgoff_t index, bool new_i_size)
495 struct address_space *mapping = inode->i_mapping;
497 struct dnode_of_data dn;
500 set_new_dnode(&dn, inode, ipage, NULL, 0);
501 err = f2fs_reserve_block(&dn, index);
505 page = grab_cache_page(mapping, index);
511 if (PageUptodate(page))
514 if (dn.data_blkaddr == NEW_ADDR) {
515 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
516 SetPageUptodate(page);
518 err = f2fs_submit_page_bio(F2FS_I_SB(inode), page,
519 dn.data_blkaddr, READ_SYNC);
524 if (unlikely(!PageUptodate(page))) {
525 f2fs_put_page(page, 1);
529 if (unlikely(page->mapping != mapping)) {
530 f2fs_put_page(page, 1);
536 i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
537 i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
538 /* Only the directory inode sets new_i_size */
539 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
548 static int __allocate_data_block(struct dnode_of_data *dn)
550 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
551 struct f2fs_inode_info *fi = F2FS_I(dn->inode);
552 struct f2fs_summary sum;
558 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
560 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
563 __set_data_blkaddr(dn, NEW_ADDR);
564 dn->data_blkaddr = NEW_ADDR;
566 get_node_info(sbi, dn->nid, &ni);
567 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
569 type = CURSEG_WARM_DATA;
571 allocate_data_block(sbi, NULL, NULL_ADDR, &new_blkaddr, &sum, type);
573 /* direct IO doesn't use extent cache to maximize the performance */
574 set_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
575 update_extent_cache(new_blkaddr, dn);
576 clear_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
579 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
581 if (i_size_read(dn->inode) < ((fofs + 1) << PAGE_CACHE_SHIFT))
582 i_size_write(dn->inode, ((fofs + 1) << PAGE_CACHE_SHIFT));
584 dn->data_blkaddr = new_blkaddr;
589 * get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh.
590 * If original data blocks are allocated, then give them to blockdev.
592 * a. preallocate requested block addresses
593 * b. do not use extent cache for better performance
594 * c. give the block addresses to blockdev
596 static int __get_data_block(struct inode *inode, sector_t iblock,
597 struct buffer_head *bh_result, int create, bool fiemap)
599 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
600 unsigned maxblocks = bh_result->b_size >> blkbits;
601 struct dnode_of_data dn;
602 int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
603 pgoff_t pgofs, end_offset;
604 int err = 0, ofs = 1;
605 bool allocated = false;
607 /* Get the page offset from the block offset(iblock) */
608 pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
610 if (check_extent_cache(inode, pgofs, bh_result))
614 f2fs_balance_fs(F2FS_I_SB(inode));
615 f2fs_lock_op(F2FS_I_SB(inode));
618 /* When reading holes, we need its node page */
619 set_new_dnode(&dn, inode, NULL, NULL, 0);
620 err = get_dnode_of_data(&dn, pgofs, mode);
626 if (dn.data_blkaddr == NEW_ADDR && !fiemap)
629 if (dn.data_blkaddr != NULL_ADDR) {
630 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
632 err = __allocate_data_block(&dn);
636 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
641 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
642 bh_result->b_size = (((size_t)1) << blkbits);
647 if (dn.ofs_in_node >= end_offset) {
649 sync_inode_page(&dn);
653 set_new_dnode(&dn, inode, NULL, NULL, 0);
654 err = get_dnode_of_data(&dn, pgofs, mode);
660 if (dn.data_blkaddr == NEW_ADDR && !fiemap)
663 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
666 if (maxblocks > (bh_result->b_size >> blkbits)) {
667 block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
668 if (blkaddr == NULL_ADDR && create) {
669 err = __allocate_data_block(&dn);
673 blkaddr = dn.data_blkaddr;
675 /* Give more consecutive addresses for the readahead */
676 if (blkaddr == (bh_result->b_blocknr + ofs)) {
680 bh_result->b_size += (((size_t)1) << blkbits);
686 sync_inode_page(&dn);
691 f2fs_unlock_op(F2FS_I_SB(inode));
693 trace_f2fs_get_data_block(inode, iblock, bh_result, err);
697 static int get_data_block(struct inode *inode, sector_t iblock,
698 struct buffer_head *bh_result, int create)
700 return __get_data_block(inode, iblock, bh_result, create, false);
703 static int get_data_block_fiemap(struct inode *inode, sector_t iblock,
704 struct buffer_head *bh_result, int create)
706 return __get_data_block(inode, iblock, bh_result, create, true);
709 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
712 return generic_block_fiemap(inode, fieinfo,
713 start, len, get_data_block_fiemap);
716 static int f2fs_read_data_page(struct file *file, struct page *page)
718 struct inode *inode = page->mapping->host;
721 trace_f2fs_readpage(page, DATA);
723 /* If the file has inline data, try to read it directly */
724 if (f2fs_has_inline_data(inode))
725 ret = f2fs_read_inline_data(inode, page);
727 ret = mpage_readpage(page, get_data_block);
732 static int f2fs_read_data_pages(struct file *file,
733 struct address_space *mapping,
734 struct list_head *pages, unsigned nr_pages)
736 struct inode *inode = file->f_mapping->host;
738 /* If the file has inline data, skip readpages */
739 if (f2fs_has_inline_data(inode))
742 return mpage_readpages(mapping, pages, nr_pages, get_data_block);
745 int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
747 struct inode *inode = page->mapping->host;
748 block_t old_blkaddr, new_blkaddr;
749 struct dnode_of_data dn;
752 set_new_dnode(&dn, inode, NULL, NULL, 0);
753 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
757 old_blkaddr = dn.data_blkaddr;
759 /* This page is already truncated */
760 if (old_blkaddr == NULL_ADDR)
763 set_page_writeback(page);
766 * If current allocation needs SSR,
767 * it had better in-place writes for updated data.
769 if (unlikely(old_blkaddr != NEW_ADDR &&
770 !is_cold_data(page) &&
771 need_inplace_update(inode))) {
772 rewrite_data_page(page, old_blkaddr, fio);
773 set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE);
775 write_data_page(page, &dn, &new_blkaddr, fio);
776 update_extent_cache(new_blkaddr, &dn);
777 set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
784 static int f2fs_write_data_page(struct page *page,
785 struct writeback_control *wbc)
787 struct inode *inode = page->mapping->host;
788 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
789 loff_t i_size = i_size_read(inode);
790 const pgoff_t end_index = ((unsigned long long) i_size)
793 bool need_balance_fs = false;
795 struct f2fs_io_info fio = {
797 .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
800 trace_f2fs_writepage(page, DATA);
802 if (page->index < end_index)
806 * If the offset is out-of-range of file size,
807 * this page does not have to be written to disk.
809 offset = i_size & (PAGE_CACHE_SIZE - 1);
810 if ((page->index >= end_index + 1) || !offset)
813 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
815 if (unlikely(sbi->por_doing))
817 if (f2fs_is_drop_cache(inode))
819 if (f2fs_is_volatile_file(inode) && !wbc->for_reclaim &&
820 available_free_memory(sbi, BASE_CHECK))
823 /* Dentry blocks are controlled by checkpoint */
824 if (S_ISDIR(inode->i_mode)) {
825 if (unlikely(f2fs_cp_error(sbi)))
827 err = do_write_data_page(page, &fio);
831 /* we should bypass data pages to proceed the kworkder jobs */
832 if (unlikely(f2fs_cp_error(sbi))) {
838 if (!wbc->for_reclaim)
839 need_balance_fs = true;
840 else if (has_not_enough_free_secs(sbi, 0))
845 if (f2fs_has_inline_data(inode))
846 err = f2fs_write_inline_data(inode, page);
848 err = do_write_data_page(page, &fio);
851 if (err && err != -ENOENT)
854 clear_cold_data(page);
856 inode_dec_dirty_pages(inode);
859 f2fs_balance_fs(sbi);
860 if (wbc->for_reclaim)
861 f2fs_submit_merged_bio(sbi, DATA, WRITE);
865 redirty_page_for_writepage(wbc, page);
866 return AOP_WRITEPAGE_ACTIVATE;
869 static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
872 struct address_space *mapping = data;
873 int ret = mapping->a_ops->writepage(page, wbc);
874 mapping_set_error(mapping, ret);
878 static int f2fs_write_data_pages(struct address_space *mapping,
879 struct writeback_control *wbc)
881 struct inode *inode = mapping->host;
882 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
887 trace_f2fs_writepages(mapping->host, wbc, DATA);
889 /* deal with chardevs and other special file */
890 if (!mapping->a_ops->writepage)
893 if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
894 get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
895 available_free_memory(sbi, DIRTY_DENTS))
898 diff = nr_pages_to_write(sbi, DATA, wbc);
900 if (!S_ISDIR(inode->i_mode)) {
901 mutex_lock(&sbi->writepages);
904 ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
906 mutex_unlock(&sbi->writepages);
908 f2fs_submit_merged_bio(sbi, DATA, WRITE);
910 remove_dirty_dir_inode(inode);
912 wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
916 wbc->pages_skipped += get_dirty_pages(inode);
920 static void f2fs_write_failed(struct address_space *mapping, loff_t to)
922 struct inode *inode = mapping->host;
924 if (to > inode->i_size) {
925 truncate_pagecache(inode, inode->i_size);
926 truncate_blocks(inode, inode->i_size, true);
930 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
931 loff_t pos, unsigned len, unsigned flags,
932 struct page **pagep, void **fsdata)
934 struct inode *inode = mapping->host;
935 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
936 struct page *page, *ipage;
937 pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
938 struct dnode_of_data dn;
941 trace_f2fs_write_begin(inode, pos, len, flags);
943 f2fs_balance_fs(sbi);
946 * We should check this at this moment to avoid deadlock on inode page
947 * and #0 page. The locking rule for inline_data conversion should be:
948 * lock_page(page #0) -> lock_page(inode_page)
951 err = f2fs_convert_inline_inode(inode);
956 page = grab_cache_page_write_begin(mapping, index, flags);
966 /* check inline_data */
967 ipage = get_node_page(sbi, inode->i_ino);
969 err = PTR_ERR(ipage);
973 set_new_dnode(&dn, inode, ipage, ipage, 0);
975 if (f2fs_has_inline_data(inode)) {
976 if (pos + len <= MAX_INLINE_DATA) {
977 read_inline_data(page, ipage);
978 set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
979 sync_inode_page(&dn);
982 err = f2fs_convert_inline_page(&dn, page);
986 err = f2fs_reserve_block(&dn, index);
993 if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
996 f2fs_wait_on_page_writeback(page, DATA);
998 if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
999 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
1000 unsigned end = start + len;
1002 /* Reading beyond i_size is simple: memset to zero */
1003 zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
1007 if (dn.data_blkaddr == NEW_ADDR) {
1008 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1010 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
1016 if (unlikely(!PageUptodate(page))) {
1017 f2fs_put_page(page, 1);
1021 if (unlikely(page->mapping != mapping)) {
1022 f2fs_put_page(page, 1);
1027 SetPageUptodate(page);
1028 clear_cold_data(page);
1032 f2fs_put_dnode(&dn);
1034 f2fs_unlock_op(sbi);
1035 f2fs_put_page(page, 1);
1037 f2fs_write_failed(mapping, pos + len);
1041 static int f2fs_write_end(struct file *file,
1042 struct address_space *mapping,
1043 loff_t pos, unsigned len, unsigned copied,
1044 struct page *page, void *fsdata)
1046 struct inode *inode = page->mapping->host;
1048 trace_f2fs_write_end(inode, pos, len, copied);
1050 set_page_dirty(page);
1052 if (pos + copied > i_size_read(inode)) {
1053 i_size_write(inode, pos + copied);
1054 mark_inode_dirty(inode);
1055 update_inode_page(inode);
1058 f2fs_put_page(page, 1);
1062 static int check_direct_IO(struct inode *inode, int rw,
1063 struct iov_iter *iter, loff_t offset)
1065 unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
1070 if (offset & blocksize_mask)
1073 if (iov_iter_alignment(iter) & blocksize_mask)
1079 static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
1080 struct iov_iter *iter, loff_t offset)
1082 struct file *file = iocb->ki_filp;
1083 struct address_space *mapping = file->f_mapping;
1084 struct inode *inode = mapping->host;
1085 size_t count = iov_iter_count(iter);
1088 /* we don't need to use inline_data strictly */
1089 if (f2fs_has_inline_data(inode)) {
1090 err = f2fs_convert_inline_inode(inode);
1095 if (check_direct_IO(inode, rw, iter, offset))
1098 trace_f2fs_direct_IO_enter(inode, offset, count, rw);
1100 err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block);
1101 if (err < 0 && (rw & WRITE))
1102 f2fs_write_failed(mapping, offset + count);
1104 trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
1109 static void f2fs_invalidate_data_page(struct page *page, unsigned int offset,
1110 unsigned int length)
1112 struct inode *inode = page->mapping->host;
1114 if (offset % PAGE_CACHE_SIZE || length != PAGE_CACHE_SIZE)
1117 if (f2fs_is_atomic_file(inode))
1118 invalidate_inmem_page(inode, page);
1120 if (PageDirty(page))
1121 inode_dec_dirty_pages(inode);
1122 ClearPagePrivate(page);
1125 static int f2fs_release_data_page(struct page *page, gfp_t wait)
1127 ClearPagePrivate(page);
1131 static int f2fs_set_data_page_dirty(struct page *page)
1133 struct address_space *mapping = page->mapping;
1134 struct inode *inode = mapping->host;
1136 trace_f2fs_set_page_dirty(page, DATA);
1138 SetPageUptodate(page);
1140 if (f2fs_is_atomic_file(inode)) {
1141 register_inmem_page(inode, page);
1145 mark_inode_dirty(inode);
1147 if (!PageDirty(page)) {
1148 __set_page_dirty_nobuffers(page);
1149 update_dirty_page(inode, page);
1155 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
1157 struct inode *inode = mapping->host;
1159 /* we don't need to use inline_data strictly */
1160 if (f2fs_has_inline_data(inode)) {
1161 int err = f2fs_convert_inline_inode(inode);
1165 return generic_block_bmap(mapping, block, get_data_block);
1168 const struct address_space_operations f2fs_dblock_aops = {
1169 .readpage = f2fs_read_data_page,
1170 .readpages = f2fs_read_data_pages,
1171 .writepage = f2fs_write_data_page,
1172 .writepages = f2fs_write_data_pages,
1173 .write_begin = f2fs_write_begin,
1174 .write_end = f2fs_write_end,
1175 .set_page_dirty = f2fs_set_data_page_dirty,
1176 .invalidatepage = f2fs_invalidate_data_page,
1177 .releasepage = f2fs_release_data_page,
1178 .direct_IO = f2fs_direct_IO,