/*
* NBD Internal Declarations
*
- * Copyright (C) 2016 Red Hat, Inc.
+ * Copyright Red Hat
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
#include "sysemu/block-backend.h"
#include "io/channel-tls.h"
-#include "qemu/coroutine.h"
#include "qemu/iov.h"
#ifndef _WIN32
#include <sys/ioctl.h>
#endif
-#if defined(__sun__) || defined(__HAIKU__)
+#ifdef HAVE_SYS_IOCCOM_H
#include <sys/ioccom.h>
#endif
#endif
#include "qemu/bswap.h"
-#include "qemu/queue.h"
-#include "qemu/main-loop.h"
/* This is all part of the "official" NBD API.
*
* https://github.com/yoe/nbd/blob/master/doc/proto.md
*/
-/* Size of all NBD_OPT_*, without payload */
+/* Size of all compact NBD_CMD_*, without payload */
#define NBD_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 4)
+/* Size of all extended NBD_CMD_*, without payload */
+#define NBD_EXTENDED_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 8)
+
/* Size of all NBD_REP_* sent in answer to most NBD_OPT_*, without payload */
#define NBD_REPLY_SIZE (4 + 4 + 8)
/* Size of reply to NBD_OPT_EXPORT_NAME */
/* Size of oldstyle negotiation */
#define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124)
-#define NBD_REQUEST_MAGIC 0x25609513
-#define NBD_REPLY_MAGIC 0x67446698
-#define NBD_OPTS_MAGIC 0x49484156454F5054LL
-#define NBD_CLIENT_MAGIC 0x0000420281861253LL
-#define NBD_REP_MAGIC 0x0003e889045565a9LL
-
-#define NBD_SET_SOCK _IO(0xab, 0)
-#define NBD_SET_BLKSIZE _IO(0xab, 1)
-#define NBD_SET_SIZE _IO(0xab, 2)
-#define NBD_DO_IT _IO(0xab, 3)
-#define NBD_CLEAR_SOCK _IO(0xab, 4)
-#define NBD_CLEAR_QUE _IO(0xab, 5)
-#define NBD_PRINT_DEBUG _IO(0xab, 6)
-#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
-#define NBD_DISCONNECT _IO(0xab, 8)
-#define NBD_SET_TIMEOUT _IO(0xab, 9)
-#define NBD_SET_FLAGS _IO(0xab, 10)
-
-/* NBD errors are based on errno numbers, so there is a 1:1 mapping,
- * but only a limited set of errno values is specified in the protocol.
- * Everything else is squashed to EINVAL.
- */
-#define NBD_SUCCESS 0
-#define NBD_EPERM 1
-#define NBD_EIO 5
-#define NBD_ENOMEM 12
-#define NBD_EINVAL 22
-#define NBD_ENOSPC 28
-#define NBD_ESHUTDOWN 108
-
-/* nbd_read_eof
- * Tries to read @size bytes from @ioc. Returns number of bytes actually read.
- * May return a value >= 0 and < size only on EOF, i.e. when iteratively called
- * qio_channel_readv() returns 0. So, there is no need to call nbd_read_eof
- * iteratively.
- */
-static inline ssize_t nbd_read_eof(QIOChannel *ioc, void *buffer, size_t size,
- Error **errp)
-{
- struct iovec iov = { .iov_base = buffer, .iov_len = size };
- /* Sockets are kept in blocking mode in the negotiation phase. After
- * that, a non-readable socket simply means that another thread stole
- * our request/reply. Synchronization is done with recv_coroutine, so
- * that this is coroutine-safe.
- */
- return nbd_rwv(ioc, &iov, 1, size, true, errp);
-}
-
-/* nbd_read
- * Reads @size bytes from @ioc. Returns 0 on success.
- */
-static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size,
- Error **errp)
-{
- ssize_t ret = nbd_read_eof(ioc, buffer, size, errp);
-
- if (ret >= 0 && ret != size) {
- ret = -EINVAL;
- error_setg(errp, "End of file");
- }
-
- return ret < 0 ? ret : 0;
-}
+#define NBD_INIT_MAGIC 0x4e42444d41474943LL /* ASCII "NBDMAGIC" */
+#define NBD_OPTS_MAGIC 0x49484156454F5054LL /* ASCII "IHAVEOPT" */
+#define NBD_CLIENT_MAGIC 0x0000420281861253LL
+#define NBD_REP_MAGIC 0x0003e889045565a9LL
+
+#define NBD_SET_SOCK _IO(0xab, 0)
+#define NBD_SET_BLKSIZE _IO(0xab, 1)
+#define NBD_SET_SIZE _IO(0xab, 2)
+#define NBD_DO_IT _IO(0xab, 3)
+#define NBD_CLEAR_SOCK _IO(0xab, 4)
+#define NBD_CLEAR_QUE _IO(0xab, 5)
+#define NBD_PRINT_DEBUG _IO(0xab, 6)
+#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
+#define NBD_DISCONNECT _IO(0xab, 8)
+#define NBD_SET_TIMEOUT _IO(0xab, 9)
+#define NBD_SET_FLAGS _IO(0xab, 10)
/* nbd_write
* Writes @size bytes to @ioc. Returns 0 on success.
static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size,
Error **errp)
{
- struct iovec iov = { .iov_base = (void *) buffer, .iov_len = size };
-
- ssize_t ret = nbd_rwv(ioc, &iov, 1, size, false, errp);
-
- assert(ret < 0 || ret == size);
-
- return ret < 0 ? ret : 0;
+ return qio_channel_write_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
}
struct NBDTLSHandshakeData {
void nbd_tls_handshake(QIOTask *task,
void *opaque);
-const char *nbd_opt_lookup(uint32_t opt);
-const char *nbd_rep_lookup(uint32_t rep);
-const char *nbd_info_lookup(uint16_t info);
-const char *nbd_cmd_lookup(uint16_t info);
int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
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