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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" | |
14 | ||
15 | #include "qemu/coroutine.h" | |
16 | ||
17 | #include <errno.h> | |
18 | #include <string.h> | |
19 | #ifndef _WIN32 | |
20 | #include <sys/ioctl.h> | |
21 | #endif | |
22 | #if defined(__sun__) || defined(__HAIKU__) | |
23 | #include <sys/ioccom.h> | |
24 | #endif | |
25 | #include <ctype.h> | |
26 | #include <inttypes.h> | |
27 | ||
28 | #ifdef __linux__ | |
29 | #include <linux/fs.h> | |
30 | #endif | |
31 | ||
32 | #include "qemu/sockets.h" | |
33 | #include "qemu/queue.h" | |
34 | #include "qemu/main-loop.h" | |
35 | ||
36 | /* #define DEBUG_NBD */ | |
37 | ||
38 | #ifdef DEBUG_NBD | |
39 | #define TRACE(msg, ...) do { \ | |
40 | LOG(msg, ## __VA_ARGS__); \ | |
41 | } while(0) | |
42 | #else | |
43 | #define TRACE(msg, ...) \ | |
44 | do { } while (0) | |
45 | #endif | |
46 | ||
47 | #define LOG(msg, ...) do { \ | |
48 | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ | |
49 | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ | |
50 | } while(0) | |
51 | ||
52 | /* This is all part of the "official" NBD API. | |
53 | * | |
54 | * The most up-to-date documentation is available at: | |
55 | * https://github.com/yoe/nbd/blob/master/doc/proto.txt | |
56 | */ | |
57 | ||
58 | #define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4) | |
59 | #define NBD_REPLY_SIZE (4 + 4 + 8) | |
60 | #define NBD_REQUEST_MAGIC 0x25609513 | |
61 | #define NBD_REPLY_MAGIC 0x67446698 | |
62 | #define NBD_OPTS_MAGIC 0x49484156454F5054LL | |
63 | #define NBD_CLIENT_MAGIC 0x0000420281861253LL | |
64 | #define NBD_REP_MAGIC 0x3e889045565a9LL | |
65 | ||
66 | #define NBD_SET_SOCK _IO(0xab, 0) | |
67 | #define NBD_SET_BLKSIZE _IO(0xab, 1) | |
68 | #define NBD_SET_SIZE _IO(0xab, 2) | |
69 | #define NBD_DO_IT _IO(0xab, 3) | |
70 | #define NBD_CLEAR_SOCK _IO(0xab, 4) | |
71 | #define NBD_CLEAR_QUE _IO(0xab, 5) | |
72 | #define NBD_PRINT_DEBUG _IO(0xab, 6) | |
73 | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) | |
74 | #define NBD_DISCONNECT _IO(0xab, 8) | |
75 | #define NBD_SET_TIMEOUT _IO(0xab, 9) | |
76 | #define NBD_SET_FLAGS _IO(0xab, 10) | |
77 | ||
78 | #define NBD_OPT_EXPORT_NAME (1) | |
79 | #define NBD_OPT_ABORT (2) | |
80 | #define NBD_OPT_LIST (3) | |
81 | ||
82 | /* NBD errors are based on errno numbers, so there is a 1:1 mapping, | |
83 | * but only a limited set of errno values is specified in the protocol. | |
84 | * Everything else is squashed to EINVAL. | |
85 | */ | |
86 | #define NBD_SUCCESS 0 | |
87 | #define NBD_EPERM 1 | |
88 | #define NBD_EIO 5 | |
89 | #define NBD_ENOMEM 12 | |
90 | #define NBD_EINVAL 22 | |
91 | #define NBD_ENOSPC 28 | |
92 | ||
93 | static inline ssize_t read_sync(int fd, void *buffer, size_t size) | |
94 | { | |
95 | /* Sockets are kept in blocking mode in the negotiation phase. After | |
96 | * that, a non-readable socket simply means that another thread stole | |
97 | * our request/reply. Synchronization is done with recv_coroutine, so | |
98 | * that this is coroutine-safe. | |
99 | */ | |
100 | return nbd_wr_sync(fd, buffer, size, true); | |
101 | } | |
102 | ||
103 | static inline ssize_t write_sync(int fd, void *buffer, size_t size) | |
104 | { | |
105 | int ret; | |
106 | do { | |
107 | /* For writes, we do expect the socket to be writable. */ | |
108 | ret = nbd_wr_sync(fd, buffer, size, false); | |
109 | } while (ret == -EAGAIN); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | #endif |