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1 | /* | |
2 | * QEMU live migration via generic fd | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2009 | |
5 | * | |
6 | * Authors: | |
7 | * Chris Lalancette <clalance@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | * Contributions after 2012-01-13 are licensed under the terms of the | |
13 | * GNU GPL, version 2 or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include "qemu-common.h" | |
17 | #include "qemu/sockets.h" | |
18 | #include "migration/migration.h" | |
19 | #include "monitor/monitor.h" | |
20 | #include "migration/qemu-file.h" | |
21 | #include "block/block.h" | |
22 | ||
23 | //#define DEBUG_MIGRATION_FD | |
24 | ||
25 | #ifdef DEBUG_MIGRATION_FD | |
26 | #define DPRINTF(fmt, ...) \ | |
27 | do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0) | |
28 | #else | |
29 | #define DPRINTF(fmt, ...) \ | |
30 | do { } while (0) | |
31 | #endif | |
32 | ||
33 | static int fd_errno(MigrationState *s) | |
34 | { | |
35 | return errno; | |
36 | } | |
37 | ||
38 | static int fd_write(MigrationState *s, const void * buf, size_t size) | |
39 | { | |
40 | return write(s->fd, buf, size); | |
41 | } | |
42 | ||
43 | static int fd_close(MigrationState *s) | |
44 | { | |
45 | struct stat st; | |
46 | int ret; | |
47 | ||
48 | DPRINTF("fd_close\n"); | |
49 | ret = fstat(s->fd, &st); | |
50 | if (ret == 0 && S_ISREG(st.st_mode)) { | |
51 | /* | |
52 | * If the file handle is a regular file make sure the | |
53 | * data is flushed to disk before signaling success. | |
54 | */ | |
55 | ret = fsync(s->fd); | |
56 | if (ret != 0) { | |
57 | ret = -errno; | |
58 | perror("migration-fd: fsync"); | |
59 | return ret; | |
60 | } | |
61 | } | |
62 | ret = close(s->fd); | |
63 | s->fd = -1; | |
64 | if (ret != 0) { | |
65 | ret = -errno; | |
66 | perror("migration-fd: close"); | |
67 | } | |
68 | return ret; | |
69 | } | |
70 | ||
71 | void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp) | |
72 | { | |
73 | s->fd = monitor_get_fd(cur_mon, fdname, errp); | |
74 | if (s->fd == -1) { | |
75 | return; | |
76 | } | |
77 | ||
78 | s->get_error = fd_errno; | |
79 | s->write = fd_write; | |
80 | s->close = fd_close; | |
81 | ||
82 | migrate_fd_connect(s); | |
83 | } | |
84 | ||
85 | static void fd_accept_incoming_migration(void *opaque) | |
86 | { | |
87 | QEMUFile *f = opaque; | |
88 | ||
89 | qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL); | |
90 | process_incoming_migration(f); | |
91 | } | |
92 | ||
93 | void fd_start_incoming_migration(const char *infd, Error **errp) | |
94 | { | |
95 | int fd; | |
96 | QEMUFile *f; | |
97 | ||
98 | DPRINTF("Attempting to start an incoming migration via fd\n"); | |
99 | ||
100 | fd = strtol(infd, NULL, 0); | |
101 | f = qemu_fdopen(fd, "rb"); | |
102 | if(f == NULL) { | |
103 | error_setg_errno(errp, errno, "failed to open the source descriptor"); | |
104 | return; | |
105 | } | |
106 | ||
107 | qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f); | |
108 | } |