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dm thin: update Documentation to clarify when "read_only" is valid 

Due to user confusion, clarify that it doesn't make sense to try to
create a thin-pool with "read_only" mode enabled.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2018-05-10 11:18:49 -04:00
parent 65972a6fa9
commit 28700a3623
1 changed files with 4 additions and 1 deletions
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5
Documentation/device-mapper/thin-provisioning.txt
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@ -264,7 +264,10 @@ i) Constructor
data device, but just remove the mapping.
read_only: Don't allow any changes to be made to the pool
metadata.
metadata. This mode is only available after the
thin-pool has been created and first used in full
read/write mode. It cannot be specified on initial
thin-pool creation.
error_if_no_space: Error IOs, instead of queueing, if no space.