From 39fc6d4d3527d790f090dcb10bdb82fd1a1d925a Mon Sep 17 00:00:00 2001 From: Daniel Tang Date: Wed, 19 Nov 2025 09:32:13 -0500 Subject: [PATCH] Documentation: ext4: Document casefold and encrypt flags Based on ext4(5) and fs/ext4/ext4.h. For INCOMPAT_ENCRYPT, it's possible to create a new filesystem with that flag without creating any encrypted inodes. ext4(5) says it adds "support" but doesn't say whether anything's actually present like COMPAT_RESIZE_INODE does. Signed-off-by: Daniel Tang Message-ID: <4506189.9SDvczpPoe@daniel-desktop3> Signed-off-by: Theodore Ts'o --- Documentation/filesystems/ext4/inodes.rst | 2 ++ Documentation/filesystems/ext4/super.rst | 4 +++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/filesystems/ext4/inodes.rst b/Documentation/filesystems/ext4/inodes.rst index cfc6c16599312..55cd5c380e923 100644 --- a/Documentation/filesystems/ext4/inodes.rst +++ b/Documentation/filesystems/ext4/inodes.rst @@ -297,6 +297,8 @@ The ``i_flags`` field is a combination of these values: - Inode has inline data (EXT4_INLINE_DATA_FL). * - 0x20000000 - Create children with the same project ID (EXT4_PROJINHERIT_FL). + * - 0x40000000 + - Use case-insensitive lookups for directory contents (EXT4_CASEFOLD_FL). * - 0x80000000 - Reserved for ext4 library (EXT4_RESERVED_FL). * - diff --git a/Documentation/filesystems/ext4/super.rst b/Documentation/filesystems/ext4/super.rst index 1b240661bfa30..9a59cded9bd77 100644 --- a/Documentation/filesystems/ext4/super.rst +++ b/Documentation/filesystems/ext4/super.rst @@ -671,7 +671,9 @@ following: * - 0x8000 - Data in inode (INCOMPAT_INLINE_DATA). * - 0x10000 - - Encrypted inodes are present on the filesystem. (INCOMPAT_ENCRYPT). + - Encrypted inodes can be present. (INCOMPAT_ENCRYPT). + * - 0x20000 + - Directories can be marked case-insensitive. (INCOMPAT_CASEFOLD). .. _super_rocompat: -- 2.47.3