f2fs: avoid retrying wrong recovery routine when error was occurred

This patch eliminates the propagation of recovery errors to the next mount.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/checkpoint.c

@@ -796,6 +796,7 @@ static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
 static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
 {
 	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 	nid_t last_nid = 0;
 	block_t start_blk;
 	struct page *cp_page;
@@ -809,7 +810,7 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
 	 * This avoids to conduct wrong roll-forward operations and uses
 	 * metapages, so should be called prior to sync_meta_pages below.
 	 */
-	discard_next_dnode(sbi);
+	discard_next_dnode(sbi, NEXT_FREE_BLKADDR(sbi, curseg));
 
 	/* Flush all the NAT/SIT pages */
 	while (get_pages(sbi, F2FS_DIRTY_META))

fs/f2fs/f2fs.h

@@ -1225,7 +1225,7 @@ void destroy_flush_cmd_control(struct f2fs_sb_info *);
 void invalidate_blocks(struct f2fs_sb_info *, block_t);
 void refresh_sit_entry(struct f2fs_sb_info *, block_t, block_t);
 void clear_prefree_segments(struct f2fs_sb_info *);
-void discard_next_dnode(struct f2fs_sb_info *);
+void discard_next_dnode(struct f2fs_sb_info *, block_t);
 int npages_for_summary_flush(struct f2fs_sb_info *);
 void allocate_new_segments(struct f2fs_sb_info *);
 struct page *get_sum_page(struct f2fs_sb_info *, unsigned int);

fs/f2fs/recovery.c

@@ -434,7 +434,9 @@ static int recover_data(struct f2fs_sb_info *sbi,
 
 int recover_fsync_data(struct f2fs_sb_info *sbi)
 {
+	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 	struct list_head inode_list;
+	block_t blkaddr;
 	int err;
 	bool need_writecp = false;
 
@@ -447,6 +449,9 @@ int recover_fsync_data(struct f2fs_sb_info *sbi)
 
 	/* step #1: find fsynced inode numbers */
 	sbi->por_doing = true;
+
+	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
 	err = find_fsync_dnodes(sbi, &inode_list);
 	if (err)
 		goto out;
@@ -462,8 +467,21 @@ int recover_fsync_data(struct f2fs_sb_info *sbi)
 out:
 	destroy_fsync_dnodes(&inode_list);
 	kmem_cache_destroy(fsync_entry_slab);
+
+	if (err) {
+		truncate_inode_pages_final(NODE_MAPPING(sbi));
+		truncate_inode_pages_final(META_MAPPING(sbi));
+	}
+
 	sbi->por_doing = false;
-	if (!err && need_writecp)
+	if (err) {
+		discard_next_dnode(sbi, blkaddr);
+
+		/* Flush all the NAT/SIT pages */
+		while (get_pages(sbi, F2FS_DIRTY_META))
+			sync_meta_pages(sbi, META, LONG_MAX);
+	} else if (need_writecp) {
 		write_checkpoint(sbi, false);
+	}
 	return err;
 }

fs/f2fs/segment.c

@@ -379,11 +379,8 @@ static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
 	return blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
 }
 
-void discard_next_dnode(struct f2fs_sb_info *sbi)
+void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)
 {
-	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
-	block_t blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
-
 	if (f2fs_issue_discard(sbi, blkaddr, 1)) {
 		struct page *page = grab_meta_page(sbi, blkaddr);
 		/* zero-filled page */