slirp: fix segv when init failed
[qemu/kevin.git] / nbd / nbd-internal.h
blob93a6ca8549e8ff9e50c9bd94e0eadb369a2e399f
1 /*
2 * NBD Internal Declarations
4 * Copyright (C) 2016 Red Hat, Inc.
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 */
10 #ifndef NBD_INTERNAL_H
11 #define NBD_INTERNAL_H
12 #include "block/nbd.h"
13 #include "sysemu/block-backend.h"
14 #include "io/channel-tls.h"
16 #include "qemu/coroutine.h"
17 #include "qemu/iov.h"
19 #ifndef _WIN32
20 #include <sys/ioctl.h>
21 #endif
22 #if defined(__sun__) || defined(__HAIKU__)
23 #include <sys/ioccom.h>
24 #endif
26 #ifdef __linux__
27 #include <linux/fs.h>
28 #endif
30 #include "qemu/bswap.h"
31 #include "qemu/queue.h"
32 #include "qemu/main-loop.h"
34 /* #define DEBUG_NBD */
36 #ifdef DEBUG_NBD
37 #define DEBUG_NBD_PRINT 1
38 #else
39 #define DEBUG_NBD_PRINT 0
40 #endif
42 #define TRACE(msg, ...) do { \
43 if (DEBUG_NBD_PRINT) { \
44 LOG(msg, ## __VA_ARGS__); \
45 } \
46 } while (0)
48 #define LOG(msg, ...) do { \
49 fprintf(stderr, "%s:%s():L%d: " msg "\n", \
50 __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
51 } while (0)
53 /* This is all part of the "official" NBD API.
55 * The most up-to-date documentation is available at:
56 * https://github.com/yoe/nbd/blob/master/doc/proto.txt
59 #define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4)
60 #define NBD_REPLY_SIZE (4 + 4 + 8)
61 #define NBD_REQUEST_MAGIC 0x25609513
62 #define NBD_REPLY_MAGIC 0x67446698
63 #define NBD_OPTS_MAGIC 0x49484156454F5054LL
64 #define NBD_CLIENT_MAGIC 0x0000420281861253LL
65 #define NBD_REP_MAGIC 0x3e889045565a9LL
67 #define NBD_SET_SOCK _IO(0xab, 0)
68 #define NBD_SET_BLKSIZE _IO(0xab, 1)
69 #define NBD_SET_SIZE _IO(0xab, 2)
70 #define NBD_DO_IT _IO(0xab, 3)
71 #define NBD_CLEAR_SOCK _IO(0xab, 4)
72 #define NBD_CLEAR_QUE _IO(0xab, 5)
73 #define NBD_PRINT_DEBUG _IO(0xab, 6)
74 #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
75 #define NBD_DISCONNECT _IO(0xab, 8)
76 #define NBD_SET_TIMEOUT _IO(0xab, 9)
77 #define NBD_SET_FLAGS _IO(0xab, 10)
79 #define NBD_OPT_EXPORT_NAME (1)
80 #define NBD_OPT_ABORT (2)
81 #define NBD_OPT_LIST (3)
82 #define NBD_OPT_PEEK_EXPORT (4)
83 #define NBD_OPT_STARTTLS (5)
85 /* NBD errors are based on errno numbers, so there is a 1:1 mapping,
86 * but only a limited set of errno values is specified in the protocol.
87 * Everything else is squashed to EINVAL.
89 #define NBD_SUCCESS 0
90 #define NBD_EPERM 1
91 #define NBD_EIO 5
92 #define NBD_ENOMEM 12
93 #define NBD_EINVAL 22
94 #define NBD_ENOSPC 28
96 static inline ssize_t read_sync(QIOChannel *ioc, void *buffer, size_t size)
98 struct iovec iov = { .iov_base = buffer, .iov_len = size };
99 /* Sockets are kept in blocking mode in the negotiation phase. After
100 * that, a non-readable socket simply means that another thread stole
101 * our request/reply. Synchronization is done with recv_coroutine, so
102 * that this is coroutine-safe.
104 return nbd_wr_syncv(ioc, &iov, 1, size, true);
107 static inline ssize_t write_sync(QIOChannel *ioc, void *buffer, size_t size)
109 struct iovec iov = { .iov_base = buffer, .iov_len = size };
111 return nbd_wr_syncv(ioc, &iov, 1, size, false);
114 struct NBDTLSHandshakeData {
115 GMainLoop *loop;
116 bool complete;
117 Error *error;
121 void nbd_tls_handshake(Object *src,
122 Error *err,
123 void *opaque);
125 #endif