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| author | Bodo Stroesser <bstroesser@ts.fujitsu.com> | 2020-04-27 17:08:23 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-05-07 22:39:22 -0400 |
| commit | 356ba2a8bc8d9f9bd2ee969df0e07b285aebb559 (patch) | |
| tree | d0ec9de230cfaa16f4a91d187592c5fb64d8042b /include/target | |
| parent | 69088a049488171bc05394799b048c8536e7dbab (diff) | |
| download | linux-rt-356ba2a8bc8d9f9bd2ee969df0e07b285aebb559.tar.gz | |
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.h | 1 |
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 *); |