1 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 5c23eb8d6ba3..5f56213908e7 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -68,7 +68,7 @@ enum {
         Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
         Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
         Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
-        Opt_discard, Opt_space_cache, Opt_err,
+        Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err,
 };
 
 static match_table_t tokens = {
@@ -93,6 +93,7 @@ static match_table_t tokens = {
         {Opt_ratio, "metadata_ratio=%d"},
         {Opt_discard, "discard"},
         {Opt_space_cache, "space_cache"},
+        {Opt_clear_cache, "clear_cache"},
         {Opt_err, NULL},
 };
 
@@ -239,6 +240,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
                 case Opt_space_cache:
                         printk(KERN_INFO "btrfs: enabling disk space caching\n");
                         btrfs_set_opt(info->mount_opt, SPACE_CACHE);
+                case Opt_clear_cache:
+                        printk(KERN_INFO "btrfs: force clearing of disk cache\n");
+                        btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
                         break;
                 case Opt_err:
                         printk(KERN_INFO "btrfs: unrecognized mount option "