Commit fe878f34 authored by Joe Thornber's avatar Joe Thornber Committed by Alasdair G Kergon
Browse files

dm thin: correct comments

Remove documentation for unimplemented 'trim' message.

I'd planned a 'trim' target message for shrinking thin devices, but
this is better handled via the discard ioctl.
Signed-off-by: default avatarJoe Thornber <>
Signed-off-by: default avatarMike Snitzer <>
Signed-off-by: default avatarAlasdair G Kergon <>
parent 035220b3
......@@ -237,16 +237,6 @@ iii) Messages
Deletes a thin device. Irreversible.
trim <dev id> <new size in sectors>
Delete mappings from the end of a thin device. Irreversible.
You might want to use this if you're reducing the size of
your thinly-provisioned device. In many cases, due to the
sharing of blocks between devices, it is not possible to
determine in advance how much space 'trim' will release. (In
future a userspace tool might be able to perform this
set_transaction_id <current id> <new id>
Userland volume managers, such as LVM, need a way to
......@@ -72,7 +72,7 @@
* missed out if the io covers the block. (schedule_copy).
* iv) insert the new mapping into the origin's btree
* (process_prepared_mappings). This act of inserting breaks some
* (process_prepared_mapping). This act of inserting breaks some
* sharing of btree nodes between the two devices. Breaking sharing only
* effects the btree of that specific device. Btrees for the other
* devices that share the block never change. The btree for the origin
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