--verbose, -v
Print more information on command execution.
--debug
Run in debug mode with full diagnostic logs. Debug output
lines are always prefixed by '#'.
--version
Show the program version.
--batch-mode
Do not ask for confirmation.
--progress-frequency <seconds>
Print separate line every <seconds> with wipe progress.
--no-wipe
Do not wipe the device after format. A device that is not
initially wiped will contain invalid checksums.
--journal-size, -j BYTES
Size of the journal.
--interleave-sectors SECTORS
The number of interleaved sectors.
--integrity-recalculate
Automatically recalculate integrity tags in kernel on
activation. The device can be used during automatic
integrity recalculation but becomes fully integrity
protected only after the background operation is finished.
This option is available since the Linux kernel version
4.19.
--integrity-recalculate-reset
Restart recalculation from the beginning of the device.
It can be used to change the integrity checksum function.
Note it does not change the tag length. This option is
available since the Linux kernel version 5.13.
--journal-watermark PERCENT
Journal watermark in percents. When the size of the
journal exceeds this watermark, the journal flush will be
started.
--journal-commit-time MS
Commit time in milliseconds. When this time passes (and no
explicit flush operation was issued), the journal is
written.
--tag-size, -t BYTES
Size of the integrity tag per-sector (here the integrity
function will store authentication tag).
NOTE: The size can be smaller that output size of the hash
function, in that case only part of the hash will be
stored.
--data-device
Specify a separate data device that contains existing
data. The <device> then will contain calculated integrity
tags and journal for this data device.
--sector-size, -s BYTES
Sector size (power of two: 512, 1024, 2048, 4096).
--buffer-sectors SECTORS
The number of sectors in one buffer.
The tag area is accessed using buffers, the large buffer
size means that the I/O size will be larger, but there
could be less I/Os issued.
--integrity, -I ALGORITHM
Use internal integrity calculation (standalone mode). The
integrity algorithm can be CRC (crc32c/crc32) or hash
function (sha1, sha256).
For HMAC (hmac-sha256) you have also to specify an
integrity key and its size.
--integrity-key-size BYTES
The size of the data integrity key. Maximum is 4096 bytes.
--integrity-key-file FILE
The file with the integrity key.
--integrity-no-journal, -D
Disable journal for integrity device.
--integrity-bitmap-mode. -B
Use alternate bitmap mode (available since Linux kernel
5.2) where dm-integrity uses bitmap instead of a journal.
If a bit in the bitmap is 1, the corresponding region's
data and integrity tags are not synchronized - if the
machine crashes, the unsynchronized regions will be
recalculated. The bitmap mode is faster than the journal
mode, because we don't have to write the data twice, but
it is also less reliable, because if data corruption
happens when the machine crashes, it may not be detected.
--bitmap-sectors-per-bit SECTORS
Number of 512-byte sectors per bitmap bit, the value must
be power of two.
--bitmap-flush-time MS
Bitmap flush time in milliseconds.
WARNING:
In case of a crash, it is possible that the data and
integrity tag doesn't match if the journal is disabled.
--integrity-recovery-mode. -R
Recovery mode (no journal, no tag checking).
NOTE: The following options are intended for testing purposes
only.
Using journal encryption does not make sense without
encryption the data, these options are internally used in
authenticated disk encryption with cryptsetup(8).
--journal-integrity ALGORITHM
Integrity algorithm for journal area. See --integrity
option for detailed specification.
--journal-integrity-key-size BYTES
The size of the journal integrity key. Maximum is 4096
bytes.
--journal-integrity-key-file FILE
The file with the integrity key.
--journal-crypt ALGORITHM
Encryption algorithm for journal data area. You can use a
block cipher here such as cbc-aes or a stream cipher, for
example, chacha20 or ctr-aes.
--journal-crypt-key-size BYTES
The size of the journal encryption key. Maximum is 4096
bytes.
--journal-crypt-key-file FILE
The file with the journal encryption key.
--allow-discards
Allow the use of discard (TRIM) requests for the device.
This option is available since the Linux kernel version
5.7.
--deferred
Defers device removal in close command until the last user
closes it.
--cancel-deferred
Removes a previously configured deferred device removal in
close command.
The dm-integrity target is available since Linux kernel version
4.12.
NOTE: Format and activation of an integrity device always
require superuser privilege because the superblock is
calculated and handled in dm-integrity kernel target.
