Commit fe878f34df89ad4af758f40bbec829807dc93a00
Committed by
Alasdair G Kergon
Alasdair G Kergon
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035220b33d
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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: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Showing 2 changed files with 1 additions and 11 deletions Side-by-side Diff
Documentation/device-mapper/thin-provisioning.txt
| ... | ... | @@ -237,16 +237,6 @@ |
| 237 | 237 | |
| 238 | 238 | Deletes a thin device. Irreversible. |
| 239 | 239 | |
| 240 | - trim <dev id> <new size in sectors> | |
| 241 | - | |
| 242 | - Delete mappings from the end of a thin device. Irreversible. | |
| 243 | - You might want to use this if you're reducing the size of | |
| 244 | - your thinly-provisioned device. In many cases, due to the | |
| 245 | - sharing of blocks between devices, it is not possible to | |
| 246 | - determine in advance how much space 'trim' will release. (In | |
| 247 | - future a userspace tool might be able to perform this | |
| 248 | - calculation.) | |
| 249 | - | |
| 250 | 240 | set_transaction_id <current id> <new id> |
| 251 | 241 | |
| 252 | 242 | Userland volume managers, such as LVM, need a way to |
drivers/md/dm-thin.c
| ... | ... | @@ -72,7 +72,7 @@ |
| 72 | 72 | * missed out if the io covers the block. (schedule_copy). |
| 73 | 73 | * |
| 74 | 74 | * iv) insert the new mapping into the origin's btree |
| 75 | - * (process_prepared_mappings). This act of inserting breaks some | |
| 75 | + * (process_prepared_mapping). This act of inserting breaks some | |
| 76 | 76 | * sharing of btree nodes between the two devices. Breaking sharing only |
| 77 | 77 | * effects the btree of that specific device. Btrees for the other |
| 78 | 78 | * devices that share the block never change. The btree for the origin |