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dm integrity: document allow_discard option

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Add decription of the allow_discard option added in commit
84597a44a9d86ac949900441cea7da0af0f2f473.

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Milan Broz 2020-04-08 23:40:08 +02:00 committed by Mike Snitzer
parent 8267d8fb48
commit 0a2bd55c19
1 changed files with 8 additions and 5 deletions
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13
Documentation/admin-guide/device-mapper/dm-integrity.rst
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@ -182,12 +182,15 @@ fix_padding
space-efficient. If this option is not present, large padding is space-efficient. If this option is not present, large padding is
used - that is for compatibility with older kernels. used - that is for compatibility with older kernels.
allow_discards
Allow block discard requests (a.k.a. TRIM) for the integrity device.
Discards are only allowed to devices using internal hash.
The journal mode (D/J), buffer_sectors, journal_watermark, commit_time can The journal mode (D/J), buffer_sectors, journal_watermark, commit_time and
be changed when reloading the target (load an inactive table and swap the allow_discards can be changed when reloading the target (load an inactive
tables with suspend and resume). The other arguments should not be changed table and swap the tables with suspend and resume). The other arguments
when reloading the target because the layout of disk data depend on them should not be changed when reloading the target because the layout of disk
and the reloaded target would be non-functional. data depend on them and the reloaded target would be non-functional.
The layout of the formatted block device: The layout of the formatted block device: