Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6

[sfrench/cifs-2.6.git] / fs / cifs / smb2pdu.c

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 61276929d139f64d1309481e69f2dfce2c8f1fe5..767555518d40ccd357b6f5540f2758bb8be6e654 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1151,13 +1151,130 @@ add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
        return 0;
 }
 
+static struct create_durable_v2 *
+create_durable_v2_buf(struct cifs_fid *pfid)
+{
+       struct create_durable_v2 *buf;
+
+       buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
+       if (!buf)
+               return NULL;
+
+       buf->ccontext.DataOffset = cpu_to_le16(offsetof
+                                       (struct create_durable_v2, dcontext));
+       buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
+       buf->ccontext.NameOffset = cpu_to_le16(offsetof
+                               (struct create_durable_v2, Name));
+       buf->ccontext.NameLength = cpu_to_le16(4);
+
+       buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
+       buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
+       get_random_bytes(buf->dcontext.CreateGuid, 16);
+       memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
+
+       /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
+       buf->Name[0] = 'D';
+       buf->Name[1] = 'H';
+       buf->Name[2] = '2';
+       buf->Name[3] = 'Q';
+       return buf;
+}
+
+static struct create_durable_handle_reconnect_v2 *
+create_reconnect_durable_v2_buf(struct cifs_fid *fid)
+{
+       struct create_durable_handle_reconnect_v2 *buf;
+
+       buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
+                       GFP_KERNEL);
+       if (!buf)
+               return NULL;
+
+       buf->ccontext.DataOffset =
+               cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
+                                    dcontext));
+       buf->ccontext.DataLength =
+               cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
+       buf->ccontext.NameOffset =
+               cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
+                           Name));
+       buf->ccontext.NameLength = cpu_to_le16(4);
+
+       buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
+       buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
+       buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
+       memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
+
+       /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
+       buf->Name[0] = 'D';
+       buf->Name[1] = 'H';
+       buf->Name[2] = '2';
+       buf->Name[3] = 'C';
+       return buf;
+}
+
 static int
-add_durable_context(struct kvec *iov, unsigned int *num_iovec,
+add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
                    struct cifs_open_parms *oparms)
 {
        struct smb2_create_req *req = iov[0].iov_base;
        unsigned int num = *num_iovec;
 
+       iov[num].iov_base = create_durable_v2_buf(oparms->fid);
+       if (iov[num].iov_base == NULL)
+               return -ENOMEM;
+       iov[num].iov_len = sizeof(struct create_durable_v2);
+       if (!req->CreateContextsOffset)
+               req->CreateContextsOffset =
+                       cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
+                                                               iov[1].iov_len);
+       le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
+       inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
+       *num_iovec = num + 1;
+       return 0;
+}
+
+static int
+add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
+                   struct cifs_open_parms *oparms)
+{
+       struct smb2_create_req *req = iov[0].iov_base;
+       unsigned int num = *num_iovec;
+
+       /* indicate that we don't need to relock the file */
+       oparms->reconnect = false;
+
+       iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
+       if (iov[num].iov_base == NULL)
+               return -ENOMEM;
+       iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
+       if (!req->CreateContextsOffset)
+               req->CreateContextsOffset =
+                       cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
+                                                               iov[1].iov_len);
+       le32_add_cpu(&req->CreateContextsLength,
+                       sizeof(struct create_durable_handle_reconnect_v2));
+       inc_rfc1001_len(&req->hdr,
+                       sizeof(struct create_durable_handle_reconnect_v2));
+       *num_iovec = num + 1;
+       return 0;
+}
+
+static int
+add_durable_context(struct kvec *iov, unsigned int *num_iovec,
+                   struct cifs_open_parms *oparms, bool use_persistent)
+{
+       struct smb2_create_req *req = iov[0].iov_base;
+       unsigned int num = *num_iovec;
+
+       if (use_persistent) {
+               if (oparms->reconnect)
+                       return add_durable_reconnect_v2_context(iov, num_iovec,
+                                                               oparms);
+               else
+                       return add_durable_v2_context(iov, num_iovec, oparms);
+       }
+
        if (oparms->reconnect) {
                iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
                /* indicate that we don't need to relock the file */
@@ -1275,7 +1392,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
                        ccontext->Next =
                                cpu_to_le32(server->vals->create_lease_size);
                }
-               rc = add_durable_context(iov, &num_iovecs, oparms);
+
+               rc = add_durable_context(iov, &num_iovecs, oparms,
+                                       tcon->use_persistent);
                if (rc) {
                        cifs_small_buf_release(req);
                        kfree(copy_path);