cifs: add SMB2_ioctl_init/free helpers to be used with compounding

Define an _init() and a _free() function for SMB2_init so that we will
be able to use it with 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 cfe9fe4..481d64d 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2468,65 +2468,46 @@ creat_exit:
        return rc;
 }
 
-/*
- *     SMB2 IOCTL is used for both IOCTLs and FSCTLs
- */
 int
-SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
-          u64 volatile_fid, u32 opcode, bool is_fsctl,
-          char *in_data, u32 indatalen,
-          char **out_data, u32 *plen /* returned data len */)
+SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
+               u64 persistent_fid, u64 volatile_fid, u32 opcode,
+               bool is_fsctl, char *in_data, u32 indatalen)
 {
-       struct smb_rqst rqst;
        struct smb2_ioctl_req *req;
-       struct smb2_ioctl_rsp *rsp;
-       struct cifs_ses *ses;
-       struct kvec iov[2];
-       struct kvec rsp_iov;
-       int resp_buftype;
-       int n_iov;
-       int rc = 0;
-       int flags = 0;
+       struct kvec *iov = rqst->rq_iov;
        unsigned int total_len;
-
-       cifs_dbg(FYI, "SMB2 IOCTL\n");
-
-       if (out_data != NULL)
-               *out_data = NULL;
-
-       /* zero out returned data len, in case of error */
-       if (plen)
-               *plen = 0;
-
-       if (tcon)
-               ses = tcon->ses;
-       else
-               return -EIO;
-
-       if (!ses || !(ses->server))
-               return -EIO;
+       int rc;
 
        rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
        if (rc)
                return rc;
 
-       if (smb3_encryption_required(tcon))
-               flags |= CIFS_TRANSFORM_REQ;
-
        req->CtlCode = cpu_to_le32(opcode);
        req->PersistentFileId = persistent_fid;
        req->VolatileFileId = volatile_fid;
 
+       iov[0].iov_base = (char *)req;
+       /*
+        * If no input data, the size of ioctl struct in
+        * protocol spec still includes a 1 byte data buffer,
+        * but if input data passed to ioctl, we do not
+        * want to double count this, so we do not send
+        * the dummy one byte of data in iovec[0] if sending
+        * input data (in iovec[1]).
+        */
        if (indatalen) {
                req->InputCount = cpu_to_le32(indatalen);
                /* do not set InputOffset if no input data */
                req->InputOffset =
                       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
+               rqst->rq_nvec = 2;
+               iov[0].iov_len = total_len - 1;
                iov[1].iov_base = in_data;
                iov[1].iov_len = indatalen;
-               n_iov = 2;
-       } else
-               n_iov = 1;
+       } else {
+               rqst->rq_nvec = 1;
+               iov[0].iov_len = total_len;
+       }
 
        req->OutputOffset = 0;
        req->OutputCount = 0; /* MBZ */
@@ -2548,33 +2529,70 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
        else
                req->Flags = 0;
 
-       iov[0].iov_base = (char *)req;
-
-       /*
-        * If no input data, the size of ioctl struct in
-        * protocol spec still includes a 1 byte data buffer,
-        * but if input data passed to ioctl, we do not
-        * want to double count this, so we do not send
-        * the dummy one byte of data in iovec[0] if sending
-        * input data (in iovec[1]).
-        */
-
-       if (indatalen) {
-               iov[0].iov_len = total_len - 1;
-       } else
-               iov[0].iov_len = total_len;
-
        /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
        if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
                req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
 
+       return 0;
+}
+
+void
+SMB2_ioctl_free(struct smb_rqst *rqst)
+{
+       if (rqst && rqst->rq_iov)
+               cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+}
+
+/*
+ *     SMB2 IOCTL is used for both IOCTLs and FSCTLs
+ */
+int
+SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
+          u64 volatile_fid, u32 opcode, bool is_fsctl,
+          char *in_data, u32 indatalen,
+          char **out_data, u32 *plen /* returned data len */)
+{
+       struct smb_rqst rqst;
+       struct smb2_ioctl_rsp *rsp = NULL;
+       struct cifs_ses *ses;
+       struct kvec iov[2];
+       struct kvec rsp_iov = {NULL, 0};
+       int resp_buftype = CIFS_NO_BUFFER;
+       int rc = 0;
+       int flags = 0;
+
+       cifs_dbg(FYI, "SMB2 IOCTL\n");
+
+       if (out_data != NULL)
+               *out_data = NULL;
+
+       /* zero out returned data len, in case of error */
+       if (plen)
+               *plen = 0;
+
+       if (tcon)
+               ses = tcon->ses;
+       else
+               return -EIO;
+
+       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 = n_iov;
+       rqst.rq_nvec = 2;
+
+       rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid,
+                            opcode, is_fsctl, in_data, indatalen);
+       if (rc)
+               goto ioctl_exit;
 
        rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
                            &rsp_iov);
-       cifs_small_buf_release(req);
        rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
 
        if (rc != 0)
@@ -2624,6 +2642,7 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
        }
 
 ioctl_exit:
+       SMB2_ioctl_free(&rqst);
        free_rsp_buf(resp_buftype, rsp);
        return rc;
 }

diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 72cc563..3c32d0c 100644 (file)
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -144,6 +144,10 @@ extern int SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon,
                     u64 persistent_fid, u64 volatile_fid, u32 opcode,
                     bool is_fsctl, char *in_data, u32 indatalen,
                     char **out_data, u32 *plen /* returned data len */);
+extern int SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
+                          u64 persistent_fid, u64 volatile_fid, u32 opcode,
+                          bool is_fsctl, char *in_data, u32 indatalen);
+extern void SMB2_ioctl_free(struct smb_rqst *rqst);
 extern int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
                      u64 persistent_file_id, u64 volatile_file_id);
 extern int SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,