Hi Gabriel,

Às 19:19 de 23/03/21, Gabriel Krisman Bertazi escreveu:
André Almeida <[email protected]> writes:

Document mounting options to enable casefold support in tmpfs.

Signed-off-by: André Almeida <[email protected]>
---
  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.

strict mode refers to the encoding, not exactly casefold.  Maybe we
could have a parameter encoding_flags that accepts the flag 'strict'.
This would make it closer to the ext4 interface.

What are the other enconding flags? Or is this more about having a properly extensible interface?

Alternatively, call this option strict_encoding.


Thanks,
        André

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