André Almeida <andrealmeid@xxxxxxxxxxxxx> writes: > 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. 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. Alternatively, call this option strict_encoding. > +========= ============================================================== > + > +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 -- Gabriel Krisman Bertazi
