cifs: prepare SMB2_Flush to be usable in compounds

Create smb2_flush_init() and smb2_flush_free() so we can use the flush command
in compounds.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 31e4a1b..ee5d749 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3287,44 +3287,64 @@ SMB2_echo(struct TCP_Server_Info *server)
        return rc;
 }
 
+void
+SMB2_flush_free(struct smb_rqst *rqst)
+{
+       if (rqst && rqst->rq_iov)
+               cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+}
+
 int
-SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
-          u64 volatile_fid)
+SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
+               struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
 {
-       struct smb_rqst rqst;
        struct smb2_flush_req *req;
-       struct cifs_ses *ses = tcon->ses;
-       struct kvec iov[1];
-       struct kvec rsp_iov;
-       int resp_buftype;
-       int rc = 0;
-       int flags = 0;
+       struct kvec *iov = rqst->rq_iov;
        unsigned int total_len;
-
-       cifs_dbg(FYI, "Flush\n");
-
-       if (!ses || !(ses->server))
-               return -EIO;
+       int rc;
 
        rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
        if (rc)
                return rc;
 
-       if (smb3_encryption_required(tcon))
-               flags |= CIFS_TRANSFORM_REQ;
-
        req->PersistentFileId = persistent_fid;
        req->VolatileFileId = volatile_fid;
 
        iov[0].iov_base = (char *)req;
        iov[0].iov_len = total_len;
 
+       return 0;
+}
+
+int
+SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
+          u64 volatile_fid)
+{
+       struct cifs_ses *ses = tcon->ses;
+       struct smb_rqst rqst;
+       struct kvec iov[1];
+       struct kvec rsp_iov = {NULL, 0};
+       int resp_buftype = CIFS_NO_BUFFER;
+       int flags = 0;
+       int rc = 0;
+
+       cifs_dbg(FYI, "flush\n");
+       if (!ses || !(ses->server))
+               return -EIO;
+
+       if (smb3_encryption_required(tcon))
+               flags |= CIFS_TRANSFORM_REQ;
+
        memset(&rqst, 0, sizeof(struct smb_rqst));
+       memset(&iov, 0, sizeof(iov));
        rqst.rq_iov = iov;
        rqst.rq_nvec = 1;
 
+       rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
+       if (rc)
+               goto flush_exit;
+
        rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
-       cifs_small_buf_release(req);
 
        if (rc != 0) {
                cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
@@ -3332,6 +3352,8 @@ SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
                                     rc);
        }
 
+ flush_exit:
+       SMB2_flush_free(&rqst);
        free_rsp_buf(resp_buftype, rsp_iov.iov_base);
        return rc;
 }

diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 07ca724..67a91b1 100644 (file)
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -158,6 +158,10 @@ extern int SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 extern void SMB2_close_free(struct smb_rqst *rqst);
 extern int SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon,
                      u64 persistent_file_id, u64 volatile_file_id);
+extern int SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
+                          struct cifs_tcon *tcon,
+                          u64 persistent_file_id, u64 volatile_file_id);
+extern void SMB2_flush_free(struct smb_rqst *rqst);
 extern int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
                           u64 persistent_file_id, u64 volatile_file_id,
                           struct smb2_file_all_info *data);