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>

5 files changed, 56 insertions, 26 deletions

diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c
index 54bffb2a1786..e6a1fc72018f 100644
--- a/fs/cifs/smb2file.c
+++ b/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);
         }
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index fed75e1646c1..a5bc1b671c12 100644
--- a/fs/cifs/smb2ops.c
+++ b/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;
 
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index f58e4dc3987b..c8cd7b6cdda2 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1873,10 +1873,21 @@ 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;
@@ -1884,15 +1895,24 @@ smb2_parse_lease_state(struct TCP_Server_Info *server,
         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);
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 7e2e782f8edd..747de9317659 100644
--- a/fs/cifs/smb2pdu.h
+++ b/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];
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 52df125e9189..07ca72486cfa 100644
--- a/fs/cifs/smb2proto.h
+++ b/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);