f2fs: fix to set flush_merge opt and show noflush_merge

Some minor modifications to flush_merge and related parameters:

  1.The FLUSH_MERGE opt is set by default only in non-ro mode.
  2.When ro and merge are set at the same time, an error is reported.
  3.Display noflush_merge mount opt.

Suggested-by: Chao Yu <chao@kernel.org>
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 8f4fc3a..75027ff 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1353,6 +1353,12 @@ default_check:
                return -EINVAL;
        }
 
+       if ((f2fs_sb_has_readonly(sbi) || f2fs_readonly(sbi->sb)) &&
+               test_opt(sbi, FLUSH_MERGE)) {
+               f2fs_err(sbi, "FLUSH_MERGE not compatible with readonly mode");
+               return -EINVAL;
+       }
+
        if (f2fs_sb_has_readonly(sbi) && !f2fs_readonly(sbi->sb)) {
                f2fs_err(sbi, "Allow to mount readonly mode only");
                return -EROFS;
@@ -1941,8 +1947,10 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
                seq_puts(seq, ",inline_dentry");
        else
                seq_puts(seq, ",noinline_dentry");
-       if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
+       if (test_opt(sbi, FLUSH_MERGE))
                seq_puts(seq, ",flush_merge");
+       else
+               seq_puts(seq, ",noflush_merge");
        if (test_opt(sbi, NOBARRIER))
                seq_puts(seq, ",nobarrier");
        else
@@ -2073,7 +2081,8 @@ static void default_options(struct f2fs_sb_info *sbi)
        set_opt(sbi, MERGE_CHECKPOINT);
        F2FS_OPTION(sbi).unusable_cap = 0;
        sbi->sb->s_flags |= SB_LAZYTIME;
-       set_opt(sbi, FLUSH_MERGE);
+       if (!f2fs_sb_has_readonly(sbi) && !f2fs_readonly(sbi->sb))
+               set_opt(sbi, FLUSH_MERGE);
        if (f2fs_hw_support_discard(sbi) || f2fs_hw_should_discard(sbi))
                set_opt(sbi, DISCARD);
        if (f2fs_sb_has_blkzoned(sbi)) {