[RFC PATCH 4/4] docs: tmpfs: Add casefold options
From: André Almeida <hidden>
Date: 2021-03-23 20:01:13
Also in:
linux-fsdevel, lkml
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
Document mounting options to enable casefold support in tmpfs. Signed-off-by: André Almeida <redacted> --- 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@sap.com>, 1.12.01
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2.31.0