1CRYPTSETUP-REFRESH(8) Maintenance Commands CRYPTSETUP-REFRESH(8)
2
6 cryptsetup-refresh - refresh parameters of an active mapping
7
9 cryptsetup refresh [<options>] <name>
10
12 Refreshes parameters of active mapping <name>.
13 Updates parameters of active device <name> without the need to
15 deactivate the device (and umount filesystem). Currently, it supports
16 parameters refresh on following devices: LUKS1, LUKS2 (including
17 authenticated encryption), plain crypt and loop-AES.
18 Mandatory parameters are identical to those of an open action for the
20 respective device type.
21 You may change following parameters on all devices
23 --perf-same_cpu_crypt, --perf-submit_from_crypt_cpus,
24 --perf-no_read_workqueue, --perf-no_write_workqueue and
25 --allow-discards.
26 Refreshing the device without any optional parameter will refresh the
28 device with default setting (respective to device type).
29 LUKS2 only:
31 The --integrity-no-journal parameter affects only LUKS2 devices with
33 the underlying dm-integrity device.
34 Adding option --persistent stores any combination of device parameters
36 above in LUKS2 metadata (only after successful refresh operation).
37 The --disable-keyring parameter refreshes a device with volume key
39 passed in dm-crypt driver.
40 <options> can be [--allow-discards, --perf-same_cpu_crypt,
42 --perf-submit_from_crypt_cpus, --perf-no_read_workqueue,
43 --perf-no_write_workqueue, --header, --disable-keyring,
44 --disable-locks, --persistent, --integrity-no-journal].
45
47 --allow-discards
48 Allow the use of discard (TRIM) requests for the device. This is
49 also not supported for LUKS2 devices with data integrity
50 protection.
51 WARNING: This command can have a negative security impact because
53 it can make filesystem-level operations visible on the physical
54 device. For example, information leaking filesystem type, used
55 space, etc. may be extractable from the physical device if the
56 discarded blocks can be located later. If in doubt, do not use it.
57 A kernel version of 3.1 or later is needed. For earlier kernels,
59 this option is ignored.
60 --perf-same_cpu_crypt
62 Perform encryption using the same cpu that IO was submitted on. The
63 default is to use an unbound workqueue so that encryption work is
64 automatically balanced between available CPUs.
65 NOTE: This option is available only for low-level dm-crypt
67 performance tuning, use only if you need a change to default
68 dm-crypt behaviour. Needs kernel 4.0 or later.
69 --perf-submit_from_crypt_cpus
71 Disable offloading writes to a separate thread after encryption.
72 There are some situations where offloading write bios from the
73 encryption threads to a single thread degrades performance
74 significantly. The default is to offload write bios to the same
75 thread.
76 NOTE: This option is available only for low-level dm-crypt
78 performance tuning, use only if you need a change to default
79 dm-crypt behaviour. Needs kernel 4.0 or later.
80 --perf-no_read_workqueue, --perf-no_write_workqueue
82 Bypass dm-crypt internal workqueue and process read or write
83 requests synchronously.
84 NOTE: These options are available only for low-level dm-crypt
86 performance tuning, use only if you need a change to default
87 dm-crypt behaviour. Needs kernel 5.9 or later.
88 --header <device or file storing the LUKS header>
90 Use a detached (separated) metadata device or file where the LUKS
91 header is stored. This option allows one to store ciphertext and
92 LUKS header on different devices.
93 For commands that change the LUKS header (e.g. luksAddKey), specify
95 the device or file with the LUKS header directly as the LUKS
96 device.
97 --disable-locks
99 Disable lock protection for metadata on disk. This option is valid
100 only for LUKS2 and ignored for other formats.
101 WARNING: Do not use this option unless you run cryptsetup in a
103 restricted environment where locking is impossible to perform
104 (where /run directory cannot be used).
105 --disable-keyring
107 Do not load volume key in kernel keyring and store it directly in
108 the dm-crypt target instead. This option is supported only for the
109 LUKS2 type.
110 --persistent
112 If used with LUKS2 devices and activation commands like open or
113 refresh, the specified activation flags are persistently written
114 into metadata and used next time automatically even for normal
115 activation. (No need to use cryptab or other system configuration
116 files.)
117 If you need to remove a persistent flag, use --persistent without
119 the flag you want to remove (e.g. to disable persistently stored
120 discard flag, use --persistent without --allow-discards).
121 Only --allow-discards, --perf-same_cpu_crypt,
123 --perf-submit_from_crypt_cpus, --perf-no_read_workqueue,
124 --perf-no_write_workqueue and --integrity-no-journal can be stored
125 persistently.
126 --integrity-no-journal
128 Activate device with integrity protection without using data
129 journal (direct write of data and integrity tags). Note that
130 without journal power fail can cause non-atomic write and data
131 corruption. Use only if journalling is performed on a different
132 storage layer.
133 --batch-mode, -q
135 Suppresses all confirmation questions. Use with care!
136 If the --verify-passphrase option is not specified, this option
138 also switches off the passphrase verification.
139 --debug or --debug-json
141 Run in debug mode with full diagnostic logs. Debug output lines are
142 always prefixed by #.
143 If --debug-json is used, additional LUKS2 JSON data structures are
145 printed.
146 --version, -V
148 Show the program version.
149 --usage
151 Show short option help.
152 --help, -?
154 Show help text and default parameters.
155
157 Report bugs at cryptsetup mailing list <cryptsetup@lists.linux.dev> or
158 in Issues project section
159 <https://gitlab.com/cryptsetup/cryptsetup/-/issues/new>.
160 Please attach output of the failed command with --debug option added.
162
164 Cryptsetup FAQ
165 <https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions>
166 cryptsetup(8), integritysetup(8) and veritysetup(8)
168
170 Part of cryptsetup project <https://gitlab.com/cryptsetup/cryptsetup/>.
171cryptsetup 2.5.0 2022-07-28 CRYPTSETUP-REFRESH(8)