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

[Greg Kroah-Hartman]

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

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

From: Jaegeuk Kim <jaeg...@kernel.org>

commit 6781eabba1bdb133eb9125c4acf6704ccbe4df02 upstream.

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

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
Signed-off-by: Ben Hutchings <ben.hutchi...@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 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);