[PATCH 4.4 007/104] f2fs: give -EINVAL for norecovery and rw mount

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>

commit 6781eabba1bdb133eb9125c4acf6704ccbe4df02 upstream.

Once detecting something to recover, f2fs should stop mounting, given norecovery
and rw mount options.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/f2fs/f2fs.h     |    2 +-
 fs/f2fs/recovery.c |   11 +++++++----
 fs/f2fs/super.c    |   14 ++++++++++++--
 3 files changed, 20 insertions(+), 7 deletions(-)

--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1867,7 +1867,7 @@ void build_gc_manager(struct f2fs_sb_inf
 /*
  * recovery.c
  */
-int recover_fsync_data(struct f2fs_sb_info *);
+int recover_fsync_data(struct f2fs_sb_info *, bool);
 bool space_for_roll_forward(struct f2fs_sb_info *);
 
 /*
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -524,12 +524,13 @@ next:
 	return err;
 }
 
-int recover_fsync_data(struct f2fs_sb_info *sbi)
+int recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
 	struct list_head inode_list;
 	block_t blkaddr;
 	int err;
+	int ret = 0;
 	bool need_writecp = false;
 
 	fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
@@ -546,11 +547,13 @@ int recover_fsync_data(struct f2fs_sb_in
 
 	/* step #1: find fsynced inode numbers */
 	err = find_fsync_dnodes(sbi, &inode_list);
-	if (err)
+	if (err || list_empty(&inode_list))
 		goto out;
 
-	if (list_empty(&inode_list))
+	if (check_only) {
+		ret = 1;
 		goto out;
+	}
 
 	need_writecp = true;
 
@@ -598,5 +601,5 @@ out:
 	} else {
 		mutex_unlock(&sbi->cp_mutex);
 	}
-	return err;
+	return ret ? ret: err;
 }
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1457,14 +1457,24 @@ try_onemore:
 		if (need_fsck)
 			set_sbi_flag(sbi, SBI_NEED_FSCK);
 
-		err = recover_fsync_data(sbi);
-		if (err) {
+		err = recover_fsync_data(sbi, false);
+		if (err < 0) {
 			need_fsck = true;
 			f2fs_msg(sb, KERN_ERR,
 				"Cannot recover all fsync data errno=%ld", err);
 			goto free_kobj;
 		}
+	} else {
+		err = recover_fsync_data(sbi, true);
+
+		if (!f2fs_readonly(sb) && err > 0) {
+			err = -EINVAL;
+			f2fs_msg(sb, KERN_ERR,
+				"Need to recover fsync data");
+			goto free_kobj;
+		}
 	}
+
 	/* recover_fsync_data() cleared this already */
 	clear_sbi_flag(sbi, SBI_POR_DOING);