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Commit c258edb2 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

Revert: "f2fs: check last page index in cached bio to decide submission" 



There is one case that we can leave bio in f2fs, result in hanging
page writeback waiter.

Thread A				Thread B
- f2fs_write_cache_pages
 - f2fs_submit_page_write
 page #0 cached in bio #0 of cold log
 - f2fs_submit_page_write
 page #1 cached in bio #1 of warm log
					- f2fs_write_cache_pages
					 - f2fs_submit_page_write
					 bio is full, submit bio #1 contain page #1
 - f2fs_submit_merged_write_cond(, page #1)
 fail to submit bio #0 due to page #1 is not in any cached bios.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent a2636f5a

fs/f2fs/checkpoint.c

+1 −2
Original line number Diff line number Diff line
@@ -276,8 +276,7 @@ static int __f2fs_write_meta_page(struct page *page, 
	dec_page_count(sbi, F2FS_DIRTY_META);



	if (wbc->for_reclaim)

		f2fs_submit_merged_write_cond(sbi, page->mapping->host,

						0, page->index, META);

		f2fs_submit_merged_write_cond(sbi, NULL, page, 0, META);



	unlock_page(page);

fs/f2fs/data.c

+19 −19
Original line number Diff line number Diff line
@@ -322,8 +322,8 @@ static void __submit_merged_bio(struct f2fs_bio_info *io) 
	io->bio = NULL;

}



static bool __has_merged_page(struct f2fs_bio_info *io,

				struct inode *inode, nid_t ino, pgoff_t idx)

static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,

						struct page *page, nid_t ino)

{

	struct bio_vec *bvec;

	struct page *target;
@@ -332,7 +332,7 @@ static bool __has_merged_page(struct f2fs_bio_info *io, 
	if (!io->bio)

		return false;



	if (!inode && !ino)

	if (!inode && !page && !ino)

		return true;



	bio_for_each_segment_all(bvec, io->bio, i) {
@@ -342,11 +342,10 @@ static bool __has_merged_page(struct f2fs_bio_info *io, 
		else

			target = fscrypt_control_page(bvec->bv_page);



		if (idx != target->index)

			continue;



		if (inode && inode == target->mapping->host)

			return true;

		if (page && page == target)

			return true;

		if (ino && ino == ino_of_node(target))

			return true;

	}
@@ -355,7 +354,8 @@ static bool __has_merged_page(struct f2fs_bio_info *io, 
}



static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,

				nid_t ino, pgoff_t idx, enum page_type type)

						struct page *page, nid_t ino,

						enum page_type type)

{

	enum page_type btype = PAGE_TYPE_OF_BIO(type);

	enum temp_type temp;
@@ -366,7 +366,7 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode, 
		io = sbi->write_io[btype] + temp;



		down_read(&io->io_rwsem);

		ret = __has_merged_page(io, inode, ino, idx);

		ret = __has_merged_page(io, inode, page, ino);

		up_read(&io->io_rwsem);



		/* TODO: use HOT temp only for meta pages now. */
@@ -397,12 +397,12 @@ static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi, 
}



static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,

				struct inode *inode, nid_t ino, pgoff_t idx,

				enum page_type type, bool force)

				struct inode *inode, struct page *page,

				nid_t ino, enum page_type type, bool force)

{

	enum temp_type temp;



	if (!force && !has_merged_page(sbi, inode, ino, idx, type))

	if (!force && !has_merged_page(sbi, inode, page, ino, type))

		return;



	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
@@ -421,10 +421,10 @@ void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type) 
}



void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,

				struct inode *inode, nid_t ino, pgoff_t idx,

				enum page_type type)

				struct inode *inode, struct page *page,

				nid_t ino, enum page_type type)

{

	__submit_merged_write_cond(sbi, inode, ino, idx, type, false);

	__submit_merged_write_cond(sbi, inode, page, ino, type, false);

}



void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
@@ -1952,7 +1952,7 @@ static int __write_data_page(struct page *page, bool *submitted, 
		ClearPageUptodate(page);



	if (wbc->for_reclaim) {

		f2fs_submit_merged_write_cond(sbi, inode, 0, page->index, DATA);

		f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA);

		clear_inode_flag(inode, FI_HOT_DATA);

		f2fs_remove_dirty_inode(inode);

		submitted = NULL;
@@ -2010,10 +2010,10 @@ static int f2fs_write_cache_pages(struct address_space *mapping, 
	pgoff_t index;

	pgoff_t end;		/* Inclusive */

	pgoff_t done_index;

	pgoff_t last_idx = ULONG_MAX;

	int cycled;

	int range_whole = 0;

	int tag;

	int nwritten = 0;



	pagevec_init(&pvec);
@@ -2116,7 +2116,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping, 
				done = 1;

				break;

			} else if (submitted) {

				last_idx = page->index;

				nwritten++;

			}



			if (--wbc->nr_to_write <= 0 &&
@@ -2138,9 +2138,9 @@ static int f2fs_write_cache_pages(struct address_space *mapping, 
	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))

		mapping->writeback_index = done_index;



	if (last_idx != ULONG_MAX)

	if (nwritten)

		f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,

						0, last_idx, DATA);

								NULL, 0, DATA);



	return ret;

}

fs/f2fs/f2fs.h

+2 −2
Original line number Diff line number Diff line
@@ -3032,8 +3032,8 @@ int f2fs_init_post_read_processing(void); 
void f2fs_destroy_post_read_processing(void);

void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type);

void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,

				struct inode *inode, nid_t ino, pgoff_t idx,

				enum page_type type);

				struct inode *inode, struct page *page,

				nid_t ino, enum page_type type);

void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi);

int f2fs_submit_page_bio(struct f2fs_io_info *fio);

void f2fs_submit_page_write(struct f2fs_io_info *fio);

fs/f2fs/node.c

+5 −6
Original line number Diff line number Diff line
@@ -1565,8 +1565,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted, 
	up_read(&sbi->node_write);



	if (wbc->for_reclaim) {

		f2fs_submit_merged_write_cond(sbi, page->mapping->host, 0,

						page->index, NODE);

		f2fs_submit_merged_write_cond(sbi, NULL, page, 0, NODE);

		submitted = NULL;

	}
@@ -1631,13 +1630,13 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode, 
			unsigned int *seq_id)

{

	pgoff_t index;

	pgoff_t last_idx = ULONG_MAX;

	struct pagevec pvec;

	int ret = 0;

	struct page *last_page = NULL;

	bool marked = false;

	nid_t ino = inode->i_ino;

	int nr_pages;

	int nwritten = 0;



	if (atomic) {

		last_page = last_fsync_dnode(sbi, ino);
@@ -1715,7 +1714,7 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode, 
				f2fs_put_page(last_page, 0);

				break;

			} else if (submitted) {

				last_idx = page->index;

				nwritten++;

			}



			if (page == last_page) {
@@ -1741,8 +1740,8 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode, 
		goto retry;

	}

out:

	if (last_idx != ULONG_MAX)

		f2fs_submit_merged_write_cond(sbi, NULL, ino, last_idx, NODE);

	if (nwritten)

		f2fs_submit_merged_write_cond(sbi, NULL, NULL, ino, NODE);

	return ret ? -EIO: 0;

}

fs/f2fs/segment.c

+5 −6
Original line number Diff line number Diff line
@@ -371,7 +371,7 @@ static int __f2fs_commit_inmem_pages(struct inode *inode) 
		.io_type = FS_DATA_IO,

	};

	struct list_head revoke_list;

	pgoff_t last_idx = ULONG_MAX;

	bool submit_bio = false;

	int err = 0;



	INIT_LIST_HEAD(&revoke_list);
@@ -406,14 +406,14 @@ static int __f2fs_commit_inmem_pages(struct inode *inode) 
			}

			/* record old blkaddr for revoking */

			cur->old_addr = fio.old_blkaddr;

			last_idx = page->index;

			submit_bio = true;

		}

		unlock_page(page);

		list_move_tail(&cur->list, &revoke_list);

	}



	if (last_idx != ULONG_MAX)

		f2fs_submit_merged_write_cond(sbi, inode, 0, last_idx, DATA);

	if (submit_bio)

		f2fs_submit_merged_write_cond(sbi, inode, NULL, 0, DATA);



	if (err) {

		/*
@@ -3181,8 +3181,7 @@ void f2fs_wait_on_page_writeback(struct page *page, 
	if (PageWriteback(page)) {

		struct f2fs_sb_info *sbi = F2FS_P_SB(page);



		f2fs_submit_merged_write_cond(sbi, page->mapping->host,

						0, page->index, type);

		f2fs_submit_merged_write_cond(sbi, NULL, page, 0, type);

		if (ordered)

			wait_on_page_writeback(page);

		else