f2fs: check read only condition before beginning write out

If the filesystem is mounted as read-only then return from that point itself
instead of first doing a writeout/wait and then checking for read-only
condition.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index c1a108ffbfcc..89241c50eb96 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -132,14 +132,15 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
                 .for_reclaim = 0,
         };
 
+        if (inode->i_sb->s_flags & MS_RDONLY)
+                return 0;
+
         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
         if (ret)
                 return ret;
 
         mutex_lock(&inode->i_mutex);
 
-        if (inode->i_sb->s_flags & MS_RDONLY)
-                goto out;
         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
                 goto out;