f2fs: fix not to drop mount options when retrying fill_super

If wrong mount option was requested, f2fs tries to fill_super again.
But, during the next trial, f2fs has no valid mount options, since
parse_options deleted all the separators in the original string.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index c3aa72f9c8c8..146e310fbf04 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -951,6 +951,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
         struct inode *root;
         long err = -EINVAL;
         bool retry = true;
+        char *options = NULL;
         int i;
 
 try_onemore:
@@ -982,9 +983,15 @@ try_onemore:
         set_opt(sbi, POSIX_ACL);
 #endif
         /* parse mount options */
-        err = parse_options(sb, (char *)data);
-        if (err)
+        options = kstrdup((const char *)data, GFP_KERNEL);
+        if (data && !options) {
+                err = -ENOMEM;
                 goto free_sb_buf;
+        }
+
+        err = parse_options(sb, options);
+        if (err)
+                goto free_options;
 
         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
         sb->s_max_links = F2FS_LINK_MAX;
@@ -1028,7 +1035,7 @@ try_onemore:
         if (IS_ERR(sbi->meta_inode)) {
                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
                 err = PTR_ERR(sbi->meta_inode);
-                goto free_sb_buf;
+                goto free_options;
         }
 
         err = get_valid_checkpoint(sbi);
@@ -1153,6 +1160,7 @@ try_onemore:
                 if (err)
                         goto free_kobj;
         }
+        kfree(options);
         return 0;
 
 free_kobj:
@@ -1177,6 +1185,8 @@ free_cp:
 free_meta_inode:
         make_bad_inode(sbi->meta_inode);
         iput(sbi->meta_inode);
+free_options:
+        kfree(options);
 free_sb_buf:
         brelse(raw_super_buf);
 free_sbi: