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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 <danielzgtg.opensource@gmail.com>
Message-ID: <4506189.9SDvczpPoe@daniel-desktop3>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Daniel Tang 2025-11-19 09:32:13 -05:00 committed by Theodore Ts'o
parent 4ada1e4f89
commit 39fc6d4d35
2 changed files with 5 additions and 1 deletions
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2
Documentation/filesystems/ext4/inodes.rst
View File

@ -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).
* -

4
Documentation/filesystems/ext4/super.rst
View File

@ -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: