cifs: update README to include details about 'fsc' option

Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/cifs/README b/fs/cifs/README
index a7081eeeb85d..7099a526f775 100644
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -301,6 +301,16 @@ A partial list of the supported mount options follows:
   gid           Set the default gid for inodes (similar to above).
   file_mode     If CIFS Unix extensions are not supported by the server
                 this overrides the default mode for file inodes.
+  fsc           Enable local disk caching using FS-Cache (off by default). This
+                option could be useful to improve performance on a slow link,
+                heavily loaded server and/or network where reading from the
+                disk is faster than reading from the server (over the network).
+                This could also impact scalability positively as the
+                number of calls to the server are reduced. However, local
+                caching is not suitable for all workloads for e.g. read-once
+                type workloads. So, you need to consider carefully your
+                workload/scenario before using this option. Currently, local
+                disk caching is functional for CIFS files opened as read-only.
   dir_mode      If CIFS Unix extensions are not supported by the server 
                 this overrides the default mode for directory inodes.
   port          attempt to contact the server on this tcp port, before