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migration: remove the QEMUFileOps 'get_buffer' callback 

This directly implements the get_buffer logic using QIOChannel APIs.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  dgilbert: Fixup len = *-*EIO as spotted by Peter Xu
This commit is contained in:
Daniel P. Berrangé 2022-06-20 12:02:02 +01:00 committed by Dr. David Alan Gilbert
parent 0ae1f7f055
commit f759d7050b
3 changed files with 16 additions and 40 deletions
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29
migration/qemu-file-channel.c
View File

@ -74,34 +74,6 @@ static ssize_t channel_writev_buffer(void *opaque,
}
static ssize_t channel_get_buffer(void *opaque,
uint8_t *buf,
int64_t pos,
size_t size,
Error **errp)
{
QIOChannel *ioc = QIO_CHANNEL(opaque);
ssize_t ret;
do {
ret = qio_channel_read(ioc, (char *)buf, size, errp);
if (ret < 0) {
if (ret == QIO_CHANNEL_ERR_BLOCK) {
if (qemu_in_coroutine()) {
qio_channel_yield(ioc, G_IO_IN);
} else {
qio_channel_wait(ioc, G_IO_IN);
}
} else {
return -EIO;
}
}
} while (ret == QIO_CHANNEL_ERR_BLOCK);
return ret;
}
static QEMUFile *channel_get_input_return_path(void *opaque)
{
QIOChannel *ioc = QIO_CHANNEL(opaque);
@ -117,7 +89,6 @@ static QEMUFile *channel_get_output_return_path(void *opaque)
}
static const QEMUFileOps channel_input_ops = {
.get_buffer = channel_get_buffer,
.get_return_path = channel_get_input_return_path,
};

18
migration/qemu-file.c
View File

@ -377,8 +377,22 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
return 0;
}
len = f->ops->get_buffer(f->ioc, f->buf + pending, f->total_transferred,
IO_BUF_SIZE - pending, &local_error);
do {
len = qio_channel_read(f->ioc,
(char *)f->buf + pending,
IO_BUF_SIZE - pending,
&local_error);
if (len == QIO_CHANNEL_ERR_BLOCK) {
if (qemu_in_coroutine()) {
qio_channel_yield(f->ioc, G_IO_IN);
} else {
qio_channel_wait(f->ioc, G_IO_IN);
}
} else if (len < 0) {
len = -EIO;
}
} while (len == QIO_CHANNEL_ERR_BLOCK);
if (len > 0) {
f->buf_size += len;
f->total_transferred += len;

9
migration/qemu-file.h
View File

@ -29,14 +29,6 @@
#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
* bytes actually read should be returned.
*/
typedef ssize_t (QEMUFileGetBufferFunc)(void *opaque, uint8_t *buf,
int64_t pos, size_t size,
Error **errp);
/*
* This function writes an iovec to file. The handler must write all
* of the data or return a negative errno value.
@ -77,7 +69,6 @@ typedef size_t (QEMURamSaveFunc)(QEMUFile *f,
typedef QEMUFile *(QEMURetPathFunc)(void *opaque);
typedef struct QEMUFileOps {
QEMUFileGetBufferFunc *get_buffer;
QEMUFileWritevBufferFunc *writev_buffer;
QEMURetPathFunc *get_return_path;
} QEMUFileOps;