ext4: only call sync_filesystm() when remounting read-only

This is the only time it is required for ext4.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a5f1170..89baee4 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4765,8 +4765,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 #endif
        char *orig_data = kstrdup(data, GFP_KERNEL);
 
-       sync_filesystem(sb);
-
        /* Store the original options */
        old_sb_flags = sb->s_flags;
        old_opts.s_mount_opt = sbi->s_mount_opt;
@@ -4837,6 +4835,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
                }
 
                if (*flags & MS_RDONLY) {
+                       err = sync_filesystem(sb);
+                       if (err < 0)
+                               goto restore_opts;
                        err = dquot_suspend(sb, -1);
                        if (err < 0)
                                goto restore_opts;