From: "André Almeida" <andrealmeid@collabora.com> To: Hugh Dickins <hughd@google.com>, Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk> Cc: krisman@collabora.com, smcv@collabora.com, kernel@collabora.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Daniel Rosenberg" <drosen@google.com>, "André Almeida" <andrealmeid@collabora.com> Subject: [RFC PATCH 4/4] docs: tmpfs: Add casefold options Date: Tue, 23 Mar 2021 16:59:41 -0300 [thread overview] Message-ID: <20210323195941.69720-5-andrealmeid@collabora.com> (raw) In-Reply-To: <20210323195941.69720-1-andrealmeid@collabora.com> Document mounting options to enable casefold support in tmpfs. Signed-off-by: André Almeida <andrealmeid@collabora.com> --- 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 -- 2.31.0
next prev parent reply other threads:[~2021-03-23 20:00 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-03-23 19:59 [RFC PATCH 0/4] mm: shmem: Add case-insensitive support for tmpfs André Almeida 2021-03-23 19:59 ` [RFC PATCH 1/4] Revert "libfs: unexport generic_ci_d_compare() and generic_ci_d_hash()" André Almeida 2021-03-23 20:15 ` Matthew Wilcox 2021-03-24 20:09 ` André Almeida 2021-03-23 19:59 ` [RFC PATCH 2/4] mm: shmem: Support case-insensitive file name lookups André Almeida 2021-03-23 20:18 ` Gabriel Krisman Bertazi 2021-03-24 20:17 ` André Almeida 2021-03-23 23:19 ` Al Viro 2021-03-24 20:44 ` André Almeida 2021-03-23 19:59 ` [RFC PATCH 3/4] mm: shmem: Add IOCTL support for tmpfs André Almeida 2021-03-23 22:15 ` Gabriel Krisman Bertazi 2021-03-23 19:59 ` André Almeida [this message] 2021-03-23 21:58 ` [RFC PATCH 4/4] docs: tmpfs: Add casefold options Randy Dunlap 2021-03-25 14:27 ` André Almeida 2021-03-23 22:19 ` Gabriel Krisman Bertazi 2021-03-24 20:47 ` André Almeida
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