[PATCH 1/2] erofs: add documentation for 'domain_id' mount option

[Jingbo Xu]

The share domain feature for fscache mode has been merged, and let's add
documentation for 'domain_id' mount option.

Signed-off-by: Jingbo Xu <jefflexu at linux.alibaba.com>
---
 Documentation/filesystems/erofs.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index 067fd1670b1f..958cad2c4997 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -120,6 +120,9 @@ dax={always,never}     Use direct access (no page cache).  See
 dax                    A legacy option which is an alias for ``dax=always``.
 device=%s              Specify a path to an extra device to be used together.
 fsid=%s                Specify a filesystem image ID for Fscache back-end.
+domain_id=%s           Specify a domain ID for Fscache back-end.  The blob
+                       images are shared among filesystem instances in the same
+                       domain.
 ===================    =========================================================
 
 Sysfs Entries
-- 
2.19.1.6.gb485710b