root / migration-fd.c @ e3e87df4
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1 | 5ac1fad3 | Paolo Bonzini | /*
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2 | 5ac1fad3 | Paolo Bonzini | * QEMU live migration via generic fd
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3 | 5ac1fad3 | Paolo Bonzini | *
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4 | 5ac1fad3 | Paolo Bonzini | * Copyright Red Hat, Inc. 2009
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5 | 5ac1fad3 | Paolo Bonzini | *
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6 | 5ac1fad3 | Paolo Bonzini | * Authors:
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7 | 5ac1fad3 | Paolo Bonzini | * Chris Lalancette <clalance@redhat.com>
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8 | 5ac1fad3 | Paolo Bonzini | *
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9 | 5ac1fad3 | Paolo Bonzini | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 5ac1fad3 | Paolo Bonzini | * the COPYING file in the top-level directory.
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11 | 5ac1fad3 | Paolo Bonzini | *
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12 | 6b620ca3 | Paolo Bonzini | * Contributions after 2012-01-13 are licensed under the terms of the
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13 | 6b620ca3 | Paolo Bonzini | * GNU GPL, version 2 or (at your option) any later version.
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14 | 5ac1fad3 | Paolo Bonzini | */
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15 | 5ac1fad3 | Paolo Bonzini | |
16 | 5ac1fad3 | Paolo Bonzini | #include "qemu-common.h" |
17 | 5ac1fad3 | Paolo Bonzini | #include "qemu_socket.h" |
18 | 5ac1fad3 | Paolo Bonzini | #include "migration.h" |
19 | 5ac1fad3 | Paolo Bonzini | #include "monitor.h" |
20 | 5ac1fad3 | Paolo Bonzini | #include "qemu-char.h" |
21 | 5ac1fad3 | Paolo Bonzini | #include "buffered_file.h" |
22 | 5ac1fad3 | Paolo Bonzini | #include "block.h" |
23 | 5ac1fad3 | Paolo Bonzini | #include "qemu_socket.h" |
24 | 5ac1fad3 | Paolo Bonzini | |
25 | 5ac1fad3 | Paolo Bonzini | //#define DEBUG_MIGRATION_FD
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26 | 5ac1fad3 | Paolo Bonzini | |
27 | 5ac1fad3 | Paolo Bonzini | #ifdef DEBUG_MIGRATION_FD
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28 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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29 | 5ac1fad3 | Paolo Bonzini | do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0) |
30 | 5ac1fad3 | Paolo Bonzini | #else
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31 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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32 | 5ac1fad3 | Paolo Bonzini | do { } while (0) |
33 | 5ac1fad3 | Paolo Bonzini | #endif
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34 | 5ac1fad3 | Paolo Bonzini | |
35 | 22f00a44 | Juan Quintela | static int fd_errno(MigrationState *s) |
36 | 5ac1fad3 | Paolo Bonzini | { |
37 | 5ac1fad3 | Paolo Bonzini | return errno;
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38 | 5ac1fad3 | Paolo Bonzini | } |
39 | 5ac1fad3 | Paolo Bonzini | |
40 | 22f00a44 | Juan Quintela | static int fd_write(MigrationState *s, const void * buf, size_t size) |
41 | 5ac1fad3 | Paolo Bonzini | { |
42 | 5ac1fad3 | Paolo Bonzini | return write(s->fd, buf, size);
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43 | 5ac1fad3 | Paolo Bonzini | } |
44 | 5ac1fad3 | Paolo Bonzini | |
45 | 22f00a44 | Juan Quintela | static int fd_close(MigrationState *s) |
46 | 5ac1fad3 | Paolo Bonzini | { |
47 | aab22936 | Gerd Hoffmann | struct stat st;
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48 | aab22936 | Gerd Hoffmann | int ret;
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49 | aab22936 | Gerd Hoffmann | |
50 | d0f2c4c6 | malc | DPRINTF("fd_close\n");
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51 | 5ac1fad3 | Paolo Bonzini | if (s->fd != -1) { |
52 | aab22936 | Gerd Hoffmann | ret = fstat(s->fd, &st); |
53 | aab22936 | Gerd Hoffmann | if (ret == 0 && S_ISREG(st.st_mode)) { |
54 | aab22936 | Gerd Hoffmann | /*
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55 | aab22936 | Gerd Hoffmann | * If the file handle is a regular file make sure the
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56 | aab22936 | Gerd Hoffmann | * data is flushed to disk before signaling success.
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57 | aab22936 | Gerd Hoffmann | */
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58 | aab22936 | Gerd Hoffmann | ret = fsync(s->fd); |
59 | aab22936 | Gerd Hoffmann | if (ret != 0) { |
60 | aab22936 | Gerd Hoffmann | ret = -errno; |
61 | aab22936 | Gerd Hoffmann | perror("migration-fd: fsync");
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62 | aab22936 | Gerd Hoffmann | return ret;
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63 | aab22936 | Gerd Hoffmann | } |
64 | aab22936 | Gerd Hoffmann | } |
65 | aab22936 | Gerd Hoffmann | ret = close(s->fd); |
66 | 5ac1fad3 | Paolo Bonzini | s->fd = -1;
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67 | aab22936 | Gerd Hoffmann | if (ret != 0) { |
68 | aab22936 | Gerd Hoffmann | ret = -errno; |
69 | aab22936 | Gerd Hoffmann | perror("migration-fd: close");
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70 | aab22936 | Gerd Hoffmann | return ret;
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71 | aab22936 | Gerd Hoffmann | } |
72 | 5ac1fad3 | Paolo Bonzini | } |
73 | 5ac1fad3 | Paolo Bonzini | return 0; |
74 | 5ac1fad3 | Paolo Bonzini | } |
75 | 5ac1fad3 | Paolo Bonzini | |
76 | 07af4452 | Juan Quintela | int fd_start_outgoing_migration(MigrationState *s, const char *fdname) |
77 | 5ac1fad3 | Paolo Bonzini | { |
78 | e1c37d0e | Luiz Capitulino | s->fd = monitor_get_fd(cur_mon, fdname); |
79 | 5ac1fad3 | Paolo Bonzini | if (s->fd == -1) { |
80 | d0f2c4c6 | malc | DPRINTF("fd_migration: invalid file descriptor identifier\n");
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81 | 07af4452 | Juan Quintela | goto err_after_get_fd;
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82 | 5ac1fad3 | Paolo Bonzini | } |
83 | 5ac1fad3 | Paolo Bonzini | |
84 | 5ac1fad3 | Paolo Bonzini | if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) { |
85 | d0f2c4c6 | malc | DPRINTF("Unable to set nonblocking mode on file descriptor\n");
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86 | 5ac1fad3 | Paolo Bonzini | goto err_after_open;
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87 | 5ac1fad3 | Paolo Bonzini | } |
88 | 5ac1fad3 | Paolo Bonzini | |
89 | 5ac1fad3 | Paolo Bonzini | s->get_error = fd_errno; |
90 | 5ac1fad3 | Paolo Bonzini | s->write = fd_write; |
91 | 5ac1fad3 | Paolo Bonzini | s->close = fd_close; |
92 | 5ac1fad3 | Paolo Bonzini | |
93 | 5ac1fad3 | Paolo Bonzini | migrate_fd_connect(s); |
94 | 07af4452 | Juan Quintela | return 0; |
95 | 5ac1fad3 | Paolo Bonzini | |
96 | 5ac1fad3 | Paolo Bonzini | err_after_open:
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97 | 5ac1fad3 | Paolo Bonzini | close(s->fd); |
98 | 07af4452 | Juan Quintela | err_after_get_fd:
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99 | 07af4452 | Juan Quintela | return -1; |
100 | 5ac1fad3 | Paolo Bonzini | } |
101 | 5ac1fad3 | Paolo Bonzini | |
102 | 5ac1fad3 | Paolo Bonzini | static void fd_accept_incoming_migration(void *opaque) |
103 | 5ac1fad3 | Paolo Bonzini | { |
104 | 5ac1fad3 | Paolo Bonzini | QEMUFile *f = opaque; |
105 | 5ac1fad3 | Paolo Bonzini | |
106 | 511c0231 | Juan Quintela | process_incoming_migration(f); |
107 | cfaf6d36 | Juan Quintela | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
108 | 5ac1fad3 | Paolo Bonzini | qemu_fclose(f); |
109 | 5ac1fad3 | Paolo Bonzini | } |
110 | 5ac1fad3 | Paolo Bonzini | |
111 | 5ac1fad3 | Paolo Bonzini | int fd_start_incoming_migration(const char *infd) |
112 | 5ac1fad3 | Paolo Bonzini | { |
113 | 5ac1fad3 | Paolo Bonzini | int fd;
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114 | 5ac1fad3 | Paolo Bonzini | QEMUFile *f; |
115 | 5ac1fad3 | Paolo Bonzini | |
116 | d0f2c4c6 | malc | DPRINTF("Attempting to start an incoming migration via fd\n");
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117 | 5ac1fad3 | Paolo Bonzini | |
118 | 5ac1fad3 | Paolo Bonzini | fd = strtol(infd, NULL, 0); |
119 | 5ac1fad3 | Paolo Bonzini | f = qemu_fdopen(fd, "rb");
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120 | 5ac1fad3 | Paolo Bonzini | if(f == NULL) { |
121 | d0f2c4c6 | malc | DPRINTF("Unable to apply qemu wrapper to file descriptor\n");
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122 | 5ac1fad3 | Paolo Bonzini | return -errno;
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123 | 5ac1fad3 | Paolo Bonzini | } |
124 | 5ac1fad3 | Paolo Bonzini | |
125 | 1c39e2a2 | Juan Quintela | qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f); |
126 | 5ac1fad3 | Paolo Bonzini | |
127 | 5ac1fad3 | Paolo Bonzini | return 0; |
128 | 5ac1fad3 | Paolo Bonzini | } |