diff options
| author | Paul Dagnelie <[email protected]> | 2019-06-21 09:40:56 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2019-06-21 09:40:56 -0700 |
| commit | a370182fed893c65c4d5a6ec96ce70535e861c62 (patch) | |
| tree | e5a448aaa8e421159a1e6d6a1b2c9ac752772de1 /module/zfs | |
| parent | 3976fd65d367a4a40c075f64763f79e6496ed917 (diff) | |
Add SCSI_PASSTHROUGH to zvols to enable UNMAP support
When exporting ZVOLs as SCSI LUNs, by default Windows will not
issue them UNMAP commands. This reduces storage efficiency in
many cases.
We add the SCSI_PASSTHROUGH flag to the zvol's device queue,
which lets the SCSI target logic know that it can handle SCSI
commands.
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: John Gallagher <[email protected]>
Signed-off-by: Paul Dagnelie <[email protected]>
Closes #8933
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/zvol.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c index 9aeadb22b..f74eb28ae 100644 --- a/module/zfs/zvol.c +++ b/module/zfs/zvol.c @@ -1876,6 +1876,10 @@ zvol_create_minor_impl(const char *name) #ifdef QUEUE_FLAG_ADD_RANDOM blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, zv->zv_queue); #endif + /* This flag was introduced in kernel version 4.12. */ +#ifdef QUEUE_FLAG_SCSI_PASSTHROUGH + blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, zv->zv_queue); +#endif if (spa_writeable(dmu_objset_spa(os))) { if (zil_replay_disable) |