[PATCH 1/2] f2fs: clear page's up-to-date if block was deallocated

[PATCH 1/2] f2fs: clear page's up-to-date if block was deallocated

[Jaegeuk Kim]

If page's on-disk block was deallocated, let's remove up-to-date flag to avoid
further access with wrong contents.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/data.c | 6 +++++-
 fs/f2fs/dir.c  | 1 +
 fs/f2fs/node.c | 2 ++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index ae5c414..62e31b2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1259,8 +1259,10 @@ int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
 	fio->blk_addr = dn.data_blkaddr;
 
 	/* This page is already truncated */
-	if (fio->blk_addr == NULL_ADDR)
+	if (fio->blk_addr == NULL_ADDR) {
+		ClearPageUptodate(page);
 		goto out_writepage;
+	}
 
 	set_page_writeback(page);
 
@@ -1355,6 +1357,8 @@ done:
 	clear_cold_data(page);
 out:
 	inode_dec_dirty_pages(inode);
+	if (err)
+		ClearPageUptodate(page);
 	unlock_page(page);
 	if (need_balance_fs)
 		f2fs_balance_fs(sbi);
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 583896c..590aeef 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -682,6 +682,7 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
 	if (bit_pos == NR_DENTRY_IN_BLOCK) {
 		truncate_hole(dir, page->index, page->index + 1);
 		clear_page_dirty_for_io(page);
+		ClearPagePrivate(page);
 		ClearPageUptodate(page);
 		inode_dec_dirty_pages(dir);
 	}
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 2842369..35a9117 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1002,6 +1002,7 @@ static int read_node_page(struct page *page, int rw)
 	get_node_info(sbi, page->index, &ni);
 
 	if (unlikely(ni.blk_addr == NULL_ADDR)) {
+		ClearPageUptodate(page);
 		f2fs_put_page(page, 1);
 		return -ENOENT;
 	}
@@ -1313,6 +1314,7 @@ static int f2fs_write_node_page(struct page *page,
 
 	/* This page is already truncated */
 	if (unlikely(ni.blk_addr == NULL_ADDR)) {
+		ClearPageUptodate(page);
 		dec_page_count(sbi, F2FS_DIRTY_NODES);
 		unlock_page(page);
 		return 0;
-- 
2.1.1

[PATCH 2/2] f2fs: check its block allocation to avoid producing wrong dirty pages

[Jaegeuk Kim]

If a page is cached but its block was deallocated, we don't need to make
the page dirty again by gc and truncate_partial_data_page.

In that case, it needs to check its block allocation all the time instead
of giving up-to-date page.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/data.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 62e31b2..389fda7 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -813,11 +813,19 @@ struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
 		.rw = sync ? READ_SYNC : READA,
 	};
 
+	/*
+	 * If sync is false, it needs to check its block allocation.
+	 * This is need and triggered by two flows:
+	 *   gc and truncate_partial_data_page.
+	 */
+	if (!sync)
+		goto search;
+
 	page = find_get_page(mapping, index);
 	if (page && PageUptodate(page))
 		return page;
 	f2fs_put_page(page, 0);
-
+search:
 	if (f2fs_lookup_extent_cache(inode, index, &ei)) {
 		dn.data_blkaddr = ei.blk + index - ei.fofs;
 		goto got_it;
-- 
2.1.1