~~~~~~~~~~~~~~~~~
[[mds-reint-rpc]]
-An RPC that implements an operation that will change the state of
-an object on an MDT. There are a variety of operations all gathered
-under the MDS_REINT 'opcode'.
-
+An MDS_REINT RPC ('pb_opc' = 36) is one that implements an operation
+that will change the state of an object on an MDT. There are a variety
+of operations all gathered under the MDS_REINT 'opcode'. The possible
+values for the 'mdt_rec_reint' struct's 'rr_opcode' field give types
+of operations that are encoded as MDS_REINT RPCs:
+
+.MDS Reint Opcodes ('rr_opcode')
+****
+[source,c]
----
typedef enum {
REINT_SETATTR = 1,
REINT_OPEN = 6,
REINT_SETXATTR = 7,
REINT_RMENTRY = 8,
- REINT_MIGRATE = 9,
- REINT_MAX
-} mds_reint_t, mdt_reint_t;
+ REINT_MIGRATE = 9
+};
----
+****
include::struct_mdt_rec_reint.txt[]
^^^^^^^^^^^^^^^^^
[[mds-reint-setattr-rpc]]
-An RPC that implements the 'setattr' sub-command of the MDS_REINT.
+The REINT_SETATTR is an RPC that implements the 'setattr' sub-command
+of the MDS_REINT.
-.MDS_REINT:REINT_SETATTR Generic Packet Structure
-image::mds-reint-setattr-generic.png["MDS_REINT:REINT_SETATTR Generic Packet Structure",height=100]
+.MDS_REINT:REINT_SETATTR Request Packet Structure
+image::mds-reint-setattr-request.png["MDS_REINT:REINT_SETATTR Request Packet Structure",height=75]
//////////////////////////////////////////////////////////////////////
-The mds-reint-setattr-generic.png diagram resembles this text art:
+The mds-reint-setattr-request.png diagram resembles this text art:
MDS_REINT:
--REINT_SETATTR-request-------------------------------------
| ptlrpc_body | mdt_rec_setattr | lustre_capa | mdt_ioepoc |
- eadata | llog_cookie | ldlm_request |
------------------------------------------------------------
+ | eadata | llog_cookie | ldlm_request |
+ ---------------------------------------
+//////////////////////////////////////////////////////////////////////
+
+'ptlrpc_body'::
+RPC descriptor. See <<struct-ptlrpc-body>>.
+
+include::struct_mdt_rec_setattr.txt[]
+
+After the 'mdt_rec_setattr' there are several more buffers defined for
+the RPC, but those before the 'ldlm_request' are often unused and
+appear as zero-length buffers in the header.
+
+'lustre_capa'::
+A "capabilities" structure. See <<struct-lustre-capa>>.
+
+'mdt_ioepoch'::
+Identifying "epoch" information. This buffer is optional and will
+appear as zero length in some packets.
+
+'eadata'::
+Information about extended attributes. This buffer is optional and will
+appear as zero length in some packets.
+
+'llog_cookie'::
+A log handle. This buffer is optional and will appear as zero length
+in some packets.
+
+'ldlm_request'::
+A structure specifying a lock that can be the subject of early lock
+cancellation. See <<early-lock-cancellation>>.
+
+.MDS_REINT:REINT_SETATTR Reply Packet Structure
+image::mds-reint-setattr-reply.png["MDS_REINT:REINT_SETATTR Reply Packet Structure",height=50]
- --REINT_SETATTR-reply----------------------------------
- | ptlrpc_body | mdt_body | mdt_md | acl | lustre_capa |
- lustre_capa |
- -------------------------------------------------------
//////////////////////////////////////////////////////////////////////
+The mds-reint-setattr-reply.png diagram resembles this text art:
+
+ MDS_REINT:
+ --REINT_SETATTR-reply--------------------------------
+ | ptlrpc_body | mdt_body | mdt_md | acl | fid1_capa |
+ -----------------------------------------------------
+ | fid2_capa |
+ -------------
+//////////////////////////////////////////////////////////////////////
+
+'ptlrpc_body'::
+RPC descriptor. See <<struct-ptlrpc-body>>.
+
+'mdt_body'::
+Metadata about the resource.
+
+'mdt_md'::
+Layout data for the resource. This buffer is optional and will appear
+as zero length in some packets. This needs to be further explained.
+
+'acl'::
+Access control list data. This buffer is optional and will appear as
+zero length in some packets.
+
+'fid1_capa'::
+The capabilities structure for the first FID in the 'mdt_body'. See
+<<struct-lustre-capa>>.
+
+'fid2_capa'::
+The capabilities structure for the second FID in the 'mdt_body'. See
+<<struct-lustre-capa>>.
REINT_SETXATTR RPC
^^^^^^^^^^^^^^^^^^
An RPC that implements the 'setxattr' sub-command of the MDS_REINT.
-.MDS_REINT:REINT_SETXATTR Generic Packet Structure
-image::mds-reint-setxattr-generic.png["MDS_REINT:REINT_SETXATTR Generic Packet Structure",height=100]
+.MDS_REINT:REINT_SETXATTR Request Packet Structure
+image::mds-reint-setxattr-request.png["MDS_REINT:REINT_SETXATTR Request Packet Structure",height=75]
//////////////////////////////////////////////////////////////////////
-The mds-reint-setxattr-generic.png diagram resembles this text art:
+The mds-reint-setxattr-request.png diagram resembles this text art:
MDS_REINT:
--REINT_SETXATTR-request-------------------------------------
| ptlrpc_body | mdt_rec_setxattr | lustre_capa | mdt_ioepoc |
- eadata | llog_cookie | ldlm_request |
-------------------------------------------------------------
-
- --REINT_SETXATTR-reply---------------------------------
- | ptlrpc_body | mdt_body | mdt_md | acl | lustre_capa |
- lustre_capa |
- -------------------------------------------------------
+ | eadata | llog_cookie | ldlm_request |
+ ---------------------------------------
//////////////////////////////////////////////////////////////////////
'ptlrpc_body'::
-RPC descriptor.
-
-include::struct_mdt_rec_setattr.txt[]
+RPC descriptor. See <<struct-ptlrpc-body>>.
include::struct_mdt_rec_setxattr.txt[]
+Returning to the remaining buffers in the REINT_SETXATTR RPC we again
+have several optional buffers followed by the 'ldlm_request'.
+
'lustre_capa'::
-So called "capabilities" structure. This is deprecated in recent
-versions of Lustre, and commonly appears in the packet header as a zero
-length buffer.
+A "capabilities" structure. See <<struct-lustre-capa>>. This buffer is
+optional and will appear as zero length in some packets.
'mdt_ioepoch'::
Identifying "epoch" information. This buffer is optional and will
A structure specifying a lock that can be the subject of early lock
cancellation. See <<early-lock-cancellation>>.
+.MDS_REINT:REINT_SETXATTR Reply Packet Structure
+image::mds-reint-setxattr-reply.png["MDS_REINT:REINT_SETXATTR Reply Packet Structure",height=50]
+
+//////////////////////////////////////////////////////////////////////
+The mds-reint-setxattr-reply.png diagram resembles this text art:
+
+ MDS_REINT:
+ --REINT_SETXATTR-reply---------------------------------
+ | ptlrpc_body | mdt_body | mdt_md | acl | fid1_capa |
+ -------------------------------------------------------
+ | fid2_capa |
+ -------------
+//////////////////////////////////////////////////////////////////////
+
+'ptlrpc_body'::
+RPC descriptor. See <<struct-ptlrpc-body>>.
+
'mdt_body'::
Metadata about the resource.
Access control list data. This buffer is optional and will appear as
zero length in some packets.
+'fid1_capa'::
+The capabilities structure for the first FID in the 'mdt_body'. See
+<<struct-lustre-capa>>.
+
+'fid2_capa'::
+The capabilities structure for the second FID in the 'mdt_body'. See
+<<struct-lustre-capa>>.
+
git://git.whamcloud.com / doc / protocol.git / blobdiff