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[PULL 09/25] migration: rename 'pos' field in QEMUFile to 'bytes_process
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PULL 09/25] migration: rename 'pos' field in QEMUFile to 'bytes_processed' |
Date: |
Thu, 23 Jun 2022 17:53:38 +0100 |
From: Daniel P. Berrangé <berrange@redhat.com>
The field name 'pos' gives the misleading impression that the QEMUFile
objects are seekable. This is not the case, as in general we just
have an opaque stream. The users of this method are only interested
in the total bytes processed. This switches to a new name that
reflects the intended usage.
Every QIOChannel backed impl of QEMUFile is currently ignoring the
'pos' field.
The only QEMUFile impl using 'pos' as an offset for I/O is the block
device vmstate. A later patch is introducing a QIOChannel impl for the
vmstate, and to handle this it is tracking a file offset itself
internally to the QIOChannel impl. So when we later eliminate the
QEMUFileOps callbacks later, the 'pos' field will no longer be used
from any I/O read/write methods.
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: Fixed long line
---
migration/qemu-file.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 03f0b13a55..eabc2d7c6e 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -50,8 +50,9 @@ struct QEMUFile {
*/
int64_t rate_limit_used;
- int64_t pos; /* start of buffer when writing, end of buffer
- when reading */
+ /* The sum of bytes transferred on the wire */
+ int64_t total_transferred;
+
int buf_index;
int buf_size; /* 0 when writing */
uint8_t buf[IO_BUF_SIZE];
@@ -241,14 +242,14 @@ void qemu_fflush(QEMUFile *f)
}
if (f->iovcnt > 0) {
expect = iov_size(f->iov, f->iovcnt);
- ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos,
- &local_error);
+ ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt,
+ f->total_transferred, &local_error);
qemu_iovec_release_ram(f);
}
if (ret >= 0) {
- f->pos += ret;
+ f->total_transferred += ret;
}
/* We expect the QEMUFile write impl to send the full
* data set we requested, so sanity check that.
@@ -357,11 +358,11 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
return 0;
}
- len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
+ len = f->ops->get_buffer(f->opaque, f->buf + pending, f->total_transferred,
IO_BUF_SIZE - pending, &local_error);
if (len > 0) {
f->buf_size += len;
- f->pos += len;
+ f->total_transferred += len;
} else if (len == 0) {
qemu_file_set_error_obj(f, -EIO, local_error);
} else if (len != -EAGAIN) {
@@ -375,7 +376,7 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
void qemu_update_position(QEMUFile *f, size_t size)
{
- f->pos += size;
+ f->total_transferred += size;
}
/** Closes the file
@@ -658,7 +659,7 @@ int qemu_get_byte(QEMUFile *f)
int64_t qemu_ftell_fast(QEMUFile *f)
{
- int64_t ret = f->pos;
+ int64_t ret = f->total_transferred;
int i;
for (i = 0; i < f->iovcnt; i++) {
@@ -671,7 +672,7 @@ int64_t qemu_ftell_fast(QEMUFile *f)
int64_t qemu_ftell(QEMUFile *f)
{
qemu_fflush(f);
- return f->pos;
+ return f->total_transferred;
}
int qemu_file_rate_limit(QEMUFile *f)
--
2.36.1
- [PULL 00/25] migration queue, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 02/25] QIOChannelSocket: Introduce assert and reduce ifdefs to improve readability, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 01/25] migration: Remove RDMA_UNREGISTRATION_EXAMPLE, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 03/25] QIOChannelSocket: Fix zero-copy send so socket flush works, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 05/25] io: add a QIOChannelNull equivalent to /dev/null, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 07/25] migration: remove unreachble RDMA code in save_hook impl, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 06/25] migration: switch to use QIOChannelNull for dummy channel, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 10/25] migration: rename qemu_ftell to qemu_file_total_transferred, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 09/25] migration: rename 'pos' field in QEMUFile to 'bytes_processed',
Dr. David Alan Gilbert (git) <=
- [PULL 11/25] migration: rename qemu_update_position to qemu_file_credit_transfer, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 04/25] migration: Change zero_copy_send from migration parameter to migration capability, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 15/25] migration: stop passing 'opaque' parameter to QEMUFile hooks, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 14/25] migration: convert savevm to use QIOChannelBlock for VMState, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 18/25] migration: remove unused QEMUFileGetFD typedef / qemu_get_fd method, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 17/25] migration: introduce new constructors for QEMUFile, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 21/25] migration: remove the QEMUFileOps 'close' callback, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 22/25] migration: remove the QEMUFileOps 'get_buffer' callback, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 24/25] migration: remove the QEMUFileOps 'get_return_path' callback, Dr. David Alan Gilbert (git), 2022/06/23
- [PULL 19/25] migration: remove the QEMUFileOps 'shut_down' callback, Dr. David Alan Gilbert (git), 2022/06/23