tune2fs.8: tweak the documentation for the encrypt feature

[tools/e2fsprogs.git] / misc / ext4.5.in

diff --git a/misc/ext4.5.in b/misc/ext4.5.in
index d8a6b16..1db61a5 100644 (file)
--- a/misc/ext4.5.in
+++ b/misc/ext4.5.in
@@ -61,6 +61,14 @@ This feature requires that the
 .B extent
 feature be enabled.
 .TP
+.B casefold
+.br
+This ext4 feature provides file system level character encoding support
+for directories with the casefold (+F) flag enabled.  This feature is
+name-preserving on the disk, but it allows applications to lookup for a
+file in the file system using an encoding equivalent version of the file
+name.
+.TP
 .B dir_index
 .br
 Use hashed b-trees to speed up name lookups in large directories.  This
@@ -88,9 +96,9 @@ extended attributes per file.
 .TP
 .B encrypt
 .br
-This ext4 feature provides file-system level encryption of data blocks
-and file names.  The inode metadata (timestamps, file size, user/group
-ownership, etc.) is
+Enables support for file-system level encryption of data blocks and file
+names.  The inode metadata (timestamps, file size, user/group ownership,
+etc.) is
 .I not
 encrypted.
 .IP
@@ -304,6 +312,18 @@ the file system using
 and it also speeds up the time required for
 .BR mke2fs (8)
 to create the file system.
+.TP
+.B verity
+.br
+Enables support for verity protected files.  Verity files are readonly,
+and their data is transparently verified against a Merkle tree hidden
+past the end of the file.  Using the Merkle tree's root hash, a verity
+file can be efficiently authenticated, independent of the file's size.
+.IP
+This feature is most useful for authenticating important read-only files
+on read-write file systems.  If the file system itself is read-only,
+then using dm-verity to authenticate the entire block device may provide
+much better security.
 .SH MOUNT OPTIONS
 This section describes mount options which are specific to ext2, ext3,
 and ext4.  Other generic mount options may be used as well; see
@@ -764,6 +784,10 @@ ext4, 4.5
 ext4, 4.13
 .IP "\fBlarge_dir\fR" 2i
 ext4, 4.13
+.IP "\fBcasefold\fR" 2i
+ext4, 5.2
+.IP "\fBverity\fR" 2i
+ext4, 5.4
 .SH SEE ALSO
 .BR mke2fs (8),
 .BR mke2fs.conf (5),