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authorBodo Stroesser <bstroesser@ts.fujitsu.com>2020-04-27 17:08:23 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2020-05-07 22:39:22 -0400
commit356ba2a8bc8d9f9bd2ee969df0e07b285aebb559 (patch)
treed0ec9de230cfaa16f4a91d187592c5fb64d8042b /include/target
parentscsi: target: Make transport_flags per device (diff)
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scsi: target: tcmu: Make pgr_support and alua_support attributes writable
Currently in tcmu reservation commands are handled by core's pr implementation (default) or completely rejected (emulate_pr set to 0). We additionally want to be able to do full reservation handling in userspace. Therefore we need a way to set TRANSPORT_FLAG_PASSTHROUGH_PGR. The inverted flag is displayed by attribute pgr_support. Since we moved the flag from transport/backend to se_device in the previous commit, we now can make it changeable per device by allowing to write the attribute. The new field transport_flags_changeable in transport/backend is used to reject writing if not allowed for a backend. Regarding ALUA we also want to be able to passthrough commands to userspace in tcmu. Therefore we need TRANSPORT_FLAG_PASSTHROUGH_ALUA to be changeable, because by setting it we can switch off all ALUA checks in core. So we also set TRANSPORT_FLAG_PASSTHROUGH_ALUA in tcmu's transport_flags_changeable. Of course, ALUA and reservation handling in userspace will work only, if session/nexus information is sent to userspace along with every command. This will be object of a patch series announced by Mike Christie. Link: https://lore.kernel.org/r/20200427150823.15350-5-bstroesser@ts.fujitsu.com Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_backend.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index 959163504f82..f51452e3b984 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -24,6 +24,7 @@ struct target_backend_ops {
struct module *owner;
u8 transport_flags_default;
+ u8 transport_flags_changeable;
int (*attach_hba)(struct se_hba *, u32);
void (*detach_hba)(struct se_hba *);