a8eceefaca
Allow multifd to open file-backed channels. This will be used when enabling the fixed-ram migration stream format which expects a seekable transport. The QIOChannel read and write methods will use the preadv/pwritev versions which don't update the file offset at each call so we can reuse the fd without re-opening for every channel. Note that this is just setup code and multifd cannot yet make use of the file channels. Signed-off-by: Fabiano Rosas <farosas@suse.de>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
#include "qemu/osdep.h"
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#include "io/channel-file.h"
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#include "file.h"
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#include "qemu/error-report.h"
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static struct FileOutgoingArgs {
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char *fname;
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int flags;
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int mode;
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} outgoing_args;
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static void qio_channel_file_connect_worker(QIOTask *task, gpointer opaque)
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{
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/* noop */
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}
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static void file_migration_cancel(Error *errp)
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{
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MigrationState *s;
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s = migrate_get_current();
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migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
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MIGRATION_STATUS_FAILED);
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migration_cancel(errp);
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}
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int file_send_channel_destroy(QIOChannel *ioc)
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{
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if (ioc) {
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qio_channel_close(ioc, NULL);
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object_unref(OBJECT(ioc));
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}
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g_free(outgoing_args.fname);
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outgoing_args.fname = NULL;
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return 0;
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}
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void file_send_channel_create(QIOTaskFunc f, void *data)
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{
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QIOChannelFile *ioc;
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QIOTask *task;
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Error *errp = NULL;
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ioc = qio_channel_file_new_path(outgoing_args.fname,
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outgoing_args.flags,
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outgoing_args.mode, &errp);
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if (!ioc) {
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file_migration_cancel(errp);
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return;
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}
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task = qio_task_new(OBJECT(ioc), f, (gpointer)data, NULL);
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qio_task_run_in_thread(task, qio_channel_file_connect_worker,
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(gpointer)data, NULL, NULL);
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}
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void file_start_outgoing_migration(MigrationState *s, const char *fname, Error **errp)
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{
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QIOChannelFile *ioc;
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int flags = O_CREAT | O_TRUNC | O_WRONLY;
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mode_t mode = 0660;
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ioc = qio_channel_file_new_path(fname, flags, mode, errp);
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if (!ioc) {
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error_report("Error creating migration outgoing channel");
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return;
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}
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outgoing_args.fname = g_strdup(fname);
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outgoing_args.flags = flags;
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outgoing_args.mode = mode;
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qio_channel_set_name(QIO_CHANNEL(ioc), "migration-file-outgoing");
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migration_channel_connect(s, QIO_CHANNEL(ioc), NULL, NULL);
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object_unref(OBJECT(ioc));
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}
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void file_start_incoming_migration(const char *fname, Error **errp)
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{
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QIOChannelFile *ioc;
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ioc = qio_channel_file_new_path(fname, O_RDONLY, 0, errp);
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if (!ioc) {
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error_report("Error creating a channel");
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return;
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}
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qio_channel_set_name(QIO_CHANNEL(ioc), "migration-file-incoming");
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migration_channel_process_incoming(QIO_CHANNEL(ioc));
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object_unref(OBJECT(ioc));
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}
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