smb3: optimize open to not send query file internal info

We can cut one third of the traffic on open by not querying the
inode number explicitly via SMB3 query_info since it is now
returned on open in the qfid context.

This is better in multiple ways, and
speeds up file open about 10% (more if network is slow).

Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smb2file.c

@@ -88,14 +88,20 @@ smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
  }
 
  if (buf) {
- /* open response does not have IndexNumber field - get it */
- rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
+ /* if open response does not have IndexNumber field - get it */
+ if (smb2_data->IndexNumber == 0) {
+ rc = SMB2_get_srv_num(xid, oparms->tcon,
+ fid->persistent_fid,
  fid->volatile_fid,
  &smb2_data->IndexNumber);
- if (rc) {
- /* let get_inode_info disable server inode numbers */
- smb2_data->IndexNumber = 0;
- rc = 0;
+ if (rc) {
+ /*
+ * let get_inode_info disable server inode
+ * numbers
+ */
+ smb2_data->IndexNumber = 0;
+ rc = 0;
+ }
  }
  move_smb2_info_to_cifs(buf, smb2_data);
  }

fs/cifs/smb2ops.c

@@ -754,11 +754,12 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
  tcon->crfid.is_valid = true;
  kref_init(&tcon->crfid.refcount);
 
+ /* BB TBD check to see if oplock level check can be removed below */
  if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
  kref_get(&tcon->crfid.refcount);
- oplock = smb2_parse_lease_state(server, o_rsp,
-  &oparms.fid->epoch,
-  oparms.fid->lease_key);
+ smb2_parse_contexts(server, o_rsp,
+ &oparms.fid->epoch,
+ oparms.fid->lease_key, &oplock, NULL);
  } else
  goto oshr_exit;
 

fs/cifs/smb2pdu.c

@@ -1873,26 +1873,46 @@ create_reconnect_durable_buf(struct cifs_fid *fid)
  return buf;
 }
 
-__u8
-smb2_parse_lease_state(struct TCP_Server_Info *server,
+static void
+parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
+{
+ struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
+
+ cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
+ pdisk_id->DiskFileId, pdisk_id->VolumeId);
+ buf->IndexNumber = pdisk_id->DiskFileId;
+}
+
+void
+smb2_parse_contexts(struct TCP_Server_Info *server,
  struct smb2_create_rsp *rsp,
- unsigned int *epoch, char *lease_key)
+ unsigned int *epoch, char *lease_key, __u8 *oplock,
+ struct smb2_file_all_info *buf)
 {
  char *data_offset;
  struct create_context *cc;
  unsigned int next;
  unsigned int remaining;
  char *name;
 
+ *oplock = 0;
  data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
  remaining = le32_to_cpu(rsp->CreateContextsLength);
  cc = (struct create_context *)data_offset;
+
+ /* Initialize inode number to 0 in case no valid data in qfid context */
+ if (buf)
+ buf->IndexNumber = 0;
+
  while (remaining >= sizeof(struct create_context)) {
  name = le16_to_cpu(cc->NameOffset) + (char *)cc;
  if (le16_to_cpu(cc->NameLength) == 4 &&
- strncmp(name, "RqLs", 4) == 0)
- return server->ops->parse_lease_buf(cc, epoch,
- lease_key);
+ strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
+ *oplock = server->ops->parse_lease_buf(cc, epoch,
+ lease_key);
+ else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
+ strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
+ parse_query_id_ctxt(cc, buf);
 
  next = le32_to_cpu(cc->Next);
  if (!next)
@@ -1901,7 +1921,10 @@ smb2_parse_lease_state(struct TCP_Server_Info *server,
  cc = (struct create_context *)((char *)cc + next);
  }
 
- return 0;
+ if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
+ *oplock = rsp->OplockLevel;
+
+ return;
 }
 
 static int
@@ -2588,12 +2611,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
  buf->DeletePending = 0;
  }
 
- if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
- *oplock = smb2_parse_lease_state(server, rsp,
- &oparms->fid->epoch,
- oparms->fid->lease_key);
- else
- *oplock = rsp->OplockLevel;
+
+ smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
+ oparms->fid->lease_key, oplock, buf);
 creat_exit:
  SMB2_open_free(&rqst);
  free_rsp_buf(resp_buftype, rsp);

fs/cifs/smb2pdu.h

@@ -818,7 +818,9 @@ struct durable_reconnect_context_v2 {
 } __packed;
 
 /* See MS-SMB2 2.2.14.2.9 */
-struct on_disk_id {
+struct create_on_disk_id {
+ struct create_context ccontext;
+ __u8 Name[8];
  __le64 DiskFileId;
  __le64 VolumeId;
  __u32 Reserved[4];

fs/cifs/smb2proto.h

@@ -228,9 +228,10 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
 
 extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
  enum securityEnum);
-extern __u8 smb2_parse_lease_state(struct TCP_Server_Info *server,
- struct smb2_create_rsp *rsp,
- unsigned int *epoch, char *lease_key);
+extern void smb2_parse_contexts(struct TCP_Server_Info *server,
+ struct smb2_create_rsp *rsp,
+ unsigned int *epoch, char *lease_key,
+ __u8 *oplock, struct smb2_file_all_info *buf);
 extern int smb3_encryption_required(const struct cifs_tcon *tcon);
 extern int smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
  struct kvec *iov, unsigned int min_buf_size);