Document mounting options to enable casefold support in tmpfs.
Signed-off-by: André Almeida <andrealmeid@xxxxxxxxxxxxx>
---
Documentation/filesystems/tmpfs.rst | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst
index 0408c245785e..84c87c309bd7 100644
--- a/Documentation/filesystems/tmpfs.rst
+++ b/Documentation/filesystems/tmpfs.rst
@@ -170,6 +170,32 @@ So 'mount -t tmpfs -o size=10G,nr_inodes=10k,mode=700 tmpfs /mytmpfs'
will give you tmpfs instance on /mytmpfs which can allocate 10GB
RAM/SWAP in 10240 inodes and it is only accessible by root.
+tmpfs has the following mounting options for case-insesitive lookups support:
+
+========= ==============================================================
+casefold Enable casefold support at this mount point using the given
+ argument as enconding. Currently only utf8 encondings are supported.
+cf_strict Enable strict casefolding at this mouting point (disabled by
+ default). This means that invalid strings should be reject by the
+ file system.
+========= ==============================================================
+
+Note that this option doesn't enable casefold by default, one needs to set
+casefold flag per directory, setting the +F attribute in an empty directory. New
+directories within a casefolded one will inherit the flag.
+
+Example::
+
+ $ mount -t tmpfs -o casefold=utf8-12.1.0,cf_strict tmpfs /mytmpfs
+ $ cd /mytmpfs
+ $ touch a; touch A
+ $ ls
+ A a
+ $ mkdir dir
+ $ chattr +F dir
+ $ touch dir/a; touch dir/A
+ $ ls dir
+ a
:Author:
Christoph Rohland <cr@xxxxxxx>, 1.12.01
--
2.31.0
