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docs: ioctl-number: document fscrypt ioctl numbers 

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 <ebiggers@google.com>
alistair/sunxi64-5.5-dsi
Eric Biggers 2019-10-09 16:34:18 -07:00
parent 6f99756dab
commit 065ab4c470
1 changed files with 1 additions and 0 deletions
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Documentation/ioctl/ioctl-number.rst
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@ -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