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Commit | Line | Data |
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798bfe00 FZ |
1 | /* |
2 | * NBD Internal Declarations | |
3 | * | |
4 | * Copyright (C) 2016 Red Hat, Inc. | |
5 | * | |
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 | */ | |
9 | ||
10 | #ifndef NBD_INTERNAL_H | |
11 | #define NBD_INTERNAL_H | |
12 | #include "block/nbd.h" | |
13 | #include "sysemu/block-backend.h" | |
f95910fe | 14 | #include "io/channel-tls.h" |
798bfe00 FZ |
15 | |
16 | #include "qemu/coroutine.h" | |
1c778ef7 | 17 | #include "qemu/iov.h" |
798bfe00 | 18 | |
798bfe00 FZ |
19 | #ifndef _WIN32 |
20 | #include <sys/ioctl.h> | |
21 | #endif | |
22 | #if defined(__sun__) || defined(__HAIKU__) | |
23 | #include <sys/ioccom.h> | |
24 | #endif | |
798bfe00 FZ |
25 | |
26 | #ifdef __linux__ | |
27 | #include <linux/fs.h> | |
28 | #endif | |
29 | ||
58369e22 | 30 | #include "qemu/bswap.h" |
798bfe00 FZ |
31 | #include "qemu/queue.h" |
32 | #include "qemu/main-loop.h" | |
33 | ||
798bfe00 FZ |
34 | /* This is all part of the "official" NBD API. |
35 | * | |
36 | * The most up-to-date documentation is available at: | |
b626b51a | 37 | * https://github.com/yoe/nbd/blob/master/doc/proto.md |
798bfe00 FZ |
38 | */ |
39 | ||
b626b51a | 40 | #define NBD_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 4) |
798bfe00 FZ |
41 | #define NBD_REPLY_SIZE (4 + 4 + 8) |
42 | #define NBD_REQUEST_MAGIC 0x25609513 | |
43 | #define NBD_REPLY_MAGIC 0x67446698 | |
44 | #define NBD_OPTS_MAGIC 0x49484156454F5054LL | |
45 | #define NBD_CLIENT_MAGIC 0x0000420281861253LL | |
c8a3a1b6 | 46 | #define NBD_REP_MAGIC 0x0003e889045565a9LL |
798bfe00 FZ |
47 | |
48 | #define NBD_SET_SOCK _IO(0xab, 0) | |
49 | #define NBD_SET_BLKSIZE _IO(0xab, 1) | |
50 | #define NBD_SET_SIZE _IO(0xab, 2) | |
51 | #define NBD_DO_IT _IO(0xab, 3) | |
52 | #define NBD_CLEAR_SOCK _IO(0xab, 4) | |
53 | #define NBD_CLEAR_QUE _IO(0xab, 5) | |
54 | #define NBD_PRINT_DEBUG _IO(0xab, 6) | |
55 | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) | |
56 | #define NBD_DISCONNECT _IO(0xab, 8) | |
57 | #define NBD_SET_TIMEOUT _IO(0xab, 9) | |
58 | #define NBD_SET_FLAGS _IO(0xab, 10) | |
59 | ||
798bfe00 FZ |
60 | /* NBD errors are based on errno numbers, so there is a 1:1 mapping, |
61 | * but only a limited set of errno values is specified in the protocol. | |
62 | * Everything else is squashed to EINVAL. | |
63 | */ | |
64 | #define NBD_SUCCESS 0 | |
65 | #define NBD_EPERM 1 | |
66 | #define NBD_EIO 5 | |
67 | #define NBD_ENOMEM 12 | |
68 | #define NBD_EINVAL 22 | |
69 | #define NBD_ENOSPC 28 | |
b6f5d3b5 | 70 | #define NBD_ESHUTDOWN 108 |
798bfe00 | 71 | |
d1fdf257 | 72 | /* nbd_read_eof |
f5d406fe VSO |
73 | * Tries to read @size bytes from @ioc. Returns number of bytes actually read. |
74 | * May return a value >= 0 and < size only on EOF, i.e. when iteratively called | |
d1fdf257 | 75 | * qio_channel_readv() returns 0. So, there is no need to call nbd_read_eof |
f5d406fe VSO |
76 | * iteratively. |
77 | */ | |
d1fdf257 VSO |
78 | static inline ssize_t nbd_read_eof(QIOChannel *ioc, void *buffer, size_t size, |
79 | Error **errp) | |
798bfe00 | 80 | { |
1c778ef7 | 81 | struct iovec iov = { .iov_base = buffer, .iov_len = size }; |
798bfe00 FZ |
82 | /* Sockets are kept in blocking mode in the negotiation phase. After |
83 | * that, a non-readable socket simply means that another thread stole | |
84 | * our request/reply. Synchronization is done with recv_coroutine, so | |
85 | * that this is coroutine-safe. | |
86 | */ | |
d1fdf257 | 87 | return nbd_rwv(ioc, &iov, 1, size, true, errp); |
798bfe00 FZ |
88 | } |
89 | ||
d1fdf257 | 90 | /* nbd_read |
f5d406fe VSO |
91 | * Reads @size bytes from @ioc. Returns 0 on success. |
92 | */ | |
d1fdf257 VSO |
93 | static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size, |
94 | Error **errp) | |
f5d406fe | 95 | { |
d1fdf257 | 96 | ssize_t ret = nbd_read_eof(ioc, buffer, size, errp); |
f5d406fe VSO |
97 | |
98 | if (ret >= 0 && ret != size) { | |
99 | ret = -EINVAL; | |
e44ed99d | 100 | error_setg(errp, "End of file"); |
f5d406fe VSO |
101 | } |
102 | ||
103 | return ret < 0 ? ret : 0; | |
104 | } | |
105 | ||
d1fdf257 | 106 | /* nbd_write |
f5d406fe VSO |
107 | * Writes @size bytes to @ioc. Returns 0 on success. |
108 | */ | |
d1fdf257 VSO |
109 | static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size, |
110 | Error **errp) | |
798bfe00 | 111 | { |
b1a75b33 | 112 | struct iovec iov = { .iov_base = (void *) buffer, .iov_len = size }; |
1c778ef7 | 113 | |
d1fdf257 | 114 | ssize_t ret = nbd_rwv(ioc, &iov, 1, size, false, errp); |
f5d406fe VSO |
115 | |
116 | assert(ret < 0 || ret == size); | |
117 | ||
118 | return ret < 0 ? ret : 0; | |
798bfe00 FZ |
119 | } |
120 | ||
f95910fe DB |
121 | struct NBDTLSHandshakeData { |
122 | GMainLoop *loop; | |
123 | bool complete; | |
124 | Error *error; | |
125 | }; | |
126 | ||
127 | ||
60e705c5 | 128 | void nbd_tls_handshake(QIOTask *task, |
f95910fe | 129 | void *opaque); |
3736cc5b EB |
130 | const char *nbd_opt_lookup(uint32_t opt); |
131 | const char *nbd_rep_lookup(uint32_t rep); | |
132 | const char *nbd_info_lookup(uint16_t info); | |
133 | const char *nbd_cmd_lookup(uint16_t info); | |
f95910fe | 134 | |
44298024 VSO |
135 | int nbd_drop(QIOChannel *ioc, size_t size, Error **errp); |
136 | ||
798bfe00 | 137 | #endif |