Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 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 | * |
Paolo Bonzini | 6b620ca | 2012-01-13 17:44:23 +0100 | [diff] [blame] | 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. |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include "qemu-common.h" |
| 17 | #include "qemu_socket.h" |
| 18 | #include "migration.h" |
| 19 | #include "monitor.h" |
| 20 | #include "qemu-char.h" |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 21 | #include "buffered_file.h" |
| 22 | #include "block.h" |
| 23 | #include "qemu_socket.h" |
| 24 | |
| 25 | //#define DEBUG_MIGRATION_FD |
| 26 | |
| 27 | #ifdef DEBUG_MIGRATION_FD |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 28 | #define DPRINTF(fmt, ...) \ |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 29 | do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0) |
| 30 | #else |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 31 | #define DPRINTF(fmt, ...) \ |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 32 | do { } while (0) |
| 33 | #endif |
| 34 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 35 | static int fd_errno(MigrationState *s) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 36 | { |
| 37 | return errno; |
| 38 | } |
| 39 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 40 | static int fd_write(MigrationState *s, const void * buf, size_t size) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 41 | { |
| 42 | return write(s->fd, buf, size); |
| 43 | } |
| 44 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 45 | static int fd_close(MigrationState *s) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 46 | { |
Gerd Hoffmann | aab2293 | 2011-10-27 09:12:04 +0200 | [diff] [blame] | 47 | struct stat st; |
| 48 | int ret; |
| 49 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 50 | DPRINTF("fd_close\n"); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 51 | if (s->fd != -1) { |
Gerd Hoffmann | aab2293 | 2011-10-27 09:12:04 +0200 | [diff] [blame] | 52 | ret = fstat(s->fd, &st); |
| 53 | if (ret == 0 && S_ISREG(st.st_mode)) { |
| 54 | /* |
| 55 | * If the file handle is a regular file make sure the |
| 56 | * data is flushed to disk before signaling success. |
| 57 | */ |
| 58 | ret = fsync(s->fd); |
| 59 | if (ret != 0) { |
| 60 | ret = -errno; |
| 61 | perror("migration-fd: fsync"); |
| 62 | return ret; |
| 63 | } |
| 64 | } |
| 65 | ret = close(s->fd); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 66 | s->fd = -1; |
Gerd Hoffmann | aab2293 | 2011-10-27 09:12:04 +0200 | [diff] [blame] | 67 | if (ret != 0) { |
| 68 | ret = -errno; |
| 69 | perror("migration-fd: close"); |
| 70 | return ret; |
| 71 | } |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 72 | } |
| 73 | return 0; |
| 74 | } |
| 75 | |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 76 | int fd_start_outgoing_migration(MigrationState *s, const char *fdname) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 77 | { |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 78 | s->fd = monitor_get_fd(s->mon, fdname); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 79 | if (s->fd == -1) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 80 | DPRINTF("fd_migration: invalid file descriptor identifier\n"); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 81 | goto err_after_get_fd; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 85 | DPRINTF("Unable to set nonblocking mode on file descriptor\n"); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 86 | goto err_after_open; |
| 87 | } |
| 88 | |
| 89 | s->get_error = fd_errno; |
| 90 | s->write = fd_write; |
| 91 | s->close = fd_close; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 92 | |
| 93 | migrate_fd_connect(s); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 94 | return 0; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 95 | |
| 96 | err_after_open: |
| 97 | close(s->fd); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 98 | err_after_get_fd: |
| 99 | return -1; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static void fd_accept_incoming_migration(void *opaque) |
| 103 | { |
| 104 | QEMUFile *f = opaque; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 105 | |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 106 | process_incoming_migration(f); |
Juan Quintela | cfaf6d3 | 2010-03-10 00:10:35 +0100 | [diff] [blame] | 107 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 108 | qemu_fclose(f); |
| 109 | } |
| 110 | |
| 111 | int fd_start_incoming_migration(const char *infd) |
| 112 | { |
| 113 | int fd; |
| 114 | QEMUFile *f; |
| 115 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 116 | DPRINTF("Attempting to start an incoming migration via fd\n"); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 117 | |
| 118 | fd = strtol(infd, NULL, 0); |
| 119 | f = qemu_fdopen(fd, "rb"); |
| 120 | if(f == NULL) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 121 | DPRINTF("Unable to apply qemu wrapper to file descriptor\n"); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 122 | return -errno; |
| 123 | } |
| 124 | |
Juan Quintela | 1c39e2a | 2010-03-11 17:55:38 +0100 | [diff] [blame] | 125 | qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 126 | |
| 127 | return 0; |
| 128 | } |