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migration: Teach QEMUFile to be QIOChannel-aware

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migration uses QIOChannel typed qemufiles.  In follow up patches, we'll need
the capability to identify this fact, so that we can get the backing QIOChannel
from a QEMUFile.

We can also define types for QEMUFile but so far since we only need to be able
to identify QIOChannel, introduce a boolean which is simpler.

Introduce another helper qemu_file_get_ioc() to return the ioc backend of a
qemufile if has_ioc is set.

No functional change.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210722175841.938739-5-peterx@redhat.com>
Reviewed-by: Lukas Straub <lukasstraub2@web.de>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Xu
2021-07-22 13:58:40 -04:00
committed by Dr. David Alan Gilbert
parent 18711405b5
commit c6ad5be7ae
5 changed files with 24 additions and 7 deletions
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4
migration/qemu-file.h
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@@ -27,6 +27,7 @@
#include <zlib.h>
#include "exec/cpu-common.h"
#include "io/channel.h"
/* Read a chunk of data from a file at the given position. The pos argument
* can be ignored if the file is only be used for streaming. The number of
@@ -119,7 +120,7 @@ typedef struct QEMUFileHooks {
QEMURamSaveFunc *save_page;
} QEMUFileHooks;
QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops, bool has_ioc);
void qemu_file_set_hooks(QEMUFile *f, const QEMUFileHooks *hooks);
int qemu_get_fd(QEMUFile *f);
int qemu_fclose(QEMUFile *f);
@@ -179,5 +180,6 @@ void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data);
size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
ram_addr_t offset, size_t size,
uint64_t *bytes_sent);
QIOChannel *qemu_file_get_ioc(QEMUFile *file);
#endif