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Date:   Wed,  9 Oct 2019 16:45:55 -0700
From:   Eric Biggers <>
Cc:     "Theodore Y . Ts'o" <>,
        Jaegeuk Kim <>,,,
Subject: [PATCH] docs: ioctl-number: document fscrypt ioctl numbers

From: Eric Biggers <>

The 'f' ioctls with numbers 19-26 decimal are currently used for fscrypt
(a.k.a. ext4/f2fs/ubifs encryption), and up to 39 decimal is reserved
for future fscrypt use, as per the comment in fs/ext4/ext4.h.  So the
reserved range is 13-27 hex.

Document this in ioctl-number.rst.

Signed-off-by: Eric Biggers <>
 Documentation/ioctl/ioctl-number.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/ioctl/ioctl-number.rst b/Documentation/ioctl/ioctl-number.rst
index bef79cd4c6b4d..4ef86433bd677 100644
--- a/Documentation/ioctl/ioctl-number.rst
+++ b/Documentation/ioctl/ioctl-number.rst
@@ -233,6 +233,7 @@ Code  Seq#    Include File                                           Comments
 'f'   00-0F  fs/ext4/ext4.h                                          conflict!
 'f'   00-0F  linux/fs.h                                              conflict!
 'f'   00-0F  fs/ocfs2/ocfs2_fs.h                                     conflict!
+'f'   13-27  linux/fscrypt.h
 'f'   81-8F  linux/fsverity.h
 'g'   00-0F  linux/usb/gadgetfs.h
 'g'   20-2F  linux/usb/g_printer.h

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