Add qemu 2.4.0

[kvmfornfv.git] / qemu / include / block / nbd.h

diff --git a/qemu/include/block/nbd.h b/qemu/include/block/nbd.h
new file mode 100644 (file)
index 0000000..65f409d
--- /dev/null
+++ b/qemu/include/block/nbd.h
@@ -0,0 +1,106 @@
+/*
+ *  Copyright (C) 2005  Anthony Liguori <anthony@codemonkey.ws>
+ *
+ *  Network Block Device
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; under version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NBD_H
+#define NBD_H
+
+#include <sys/types.h>
+
+#include "qemu-common.h"
+#include "qemu/option.h"
+
+struct nbd_request {
+    uint32_t magic;
+    uint32_t type;
+    uint64_t handle;
+    uint64_t from;
+    uint32_t len;
+} QEMU_PACKED;
+
+struct nbd_reply {
+    uint32_t magic;
+    uint32_t error;
+    uint64_t handle;
+} QEMU_PACKED;
+
+#define NBD_FLAG_HAS_FLAGS      (1 << 0)        /* Flags are there */
+#define NBD_FLAG_READ_ONLY      (1 << 1)        /* Device is read-only */
+#define NBD_FLAG_SEND_FLUSH     (1 << 2)        /* Send FLUSH */
+#define NBD_FLAG_SEND_FUA       (1 << 3)        /* Send FUA (Force Unit Access) */
+#define NBD_FLAG_ROTATIONAL     (1 << 4)        /* Use elevator algorithm - rotational media */
+#define NBD_FLAG_SEND_TRIM      (1 << 5)        /* Send TRIM (discard) */
+
+/* New-style global flags. */
+#define NBD_FLAG_FIXED_NEWSTYLE     (1 << 0)    /* Fixed newstyle protocol. */
+
+/* New-style client flags. */
+#define NBD_FLAG_C_FIXED_NEWSTYLE   (1 << 0)    /* Fixed newstyle protocol. */
+
+/* Reply types. */
+#define NBD_REP_ACK             (1)             /* Data sending finished. */
+#define NBD_REP_SERVER          (2)             /* Export description. */
+#define NBD_REP_ERR_UNSUP       ((UINT32_C(1) << 31) | 1) /* Unknown option. */
+#define NBD_REP_ERR_INVALID     ((UINT32_C(1) << 31) | 3) /* Invalid length. */
+
+#define NBD_CMD_MASK_COMMAND   0x0000ffff
+#define NBD_CMD_FLAG_FUA       (1 << 16)
+
+enum {
+    NBD_CMD_READ = 0,
+    NBD_CMD_WRITE = 1,
+    NBD_CMD_DISC = 2,
+    NBD_CMD_FLUSH = 3,
+    NBD_CMD_TRIM = 4
+};
+
+#define NBD_DEFAULT_PORT       10809
+
+/* Maximum size of a single READ/WRITE data buffer */
+#define NBD_MAX_BUFFER_SIZE (32 * 1024 * 1024)
+
+ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
+int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
+                          off_t *size, Error **errp);
+int nbd_init(int fd, int csock, uint32_t flags, off_t size);
+ssize_t nbd_send_request(int csock, struct nbd_request *request);
+ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply);
+int nbd_client(int fd);
+int nbd_disconnect(int fd);
+
+typedef struct NBDExport NBDExport;
+typedef struct NBDClient NBDClient;
+
+NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size,
+                          uint32_t nbdflags, void (*close)(NBDExport *),
+                          Error **errp);
+void nbd_export_close(NBDExport *exp);
+void nbd_export_get(NBDExport *exp);
+void nbd_export_put(NBDExport *exp);
+
+BlockBackend *nbd_export_get_blockdev(NBDExport *exp);
+
+NBDExport *nbd_export_find(const char *name);
+void nbd_export_set_name(NBDExport *exp, const char *name);
+void nbd_export_close_all(void);
+
+NBDClient *nbd_client_new(NBDExport *exp, int csock,
+                          void (*close)(NBDClient *));
+void nbd_client_get(NBDClient *client);
+void nbd_client_put(NBDClient *client);
+
+#endif