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migration: make qemu_ftell() public and support writable files 

Migration .save_live_iterate() functions return the number of bytes
transferred.  The easiest way of doing this is by calling qemu_ftell(f)
at the beginning and end of the function to calculate the difference.

Make qemu_ftell() public so that block-migration will be able to use it.
Also adjust the ftell calculation for writable files where buf_offset
does not include buf_size.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-id: 1360661835-28663-2-git-send-email-stefanha@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2013-02-12 10:37:14 +01:00 committed by Anthony Liguori
parent 4a0e6714b0
commit ad55ab42d4
2 changed files with 8 additions and 2 deletions
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1
include/migration/qemu-file.h
View File

@ -81,6 +81,7 @@ QEMUFile *qemu_popen(FILE *popen_file, const char *mode);
QEMUFile *qemu_popen_cmd(const char *command, const char *mode);
int qemu_get_fd(QEMUFile *f);
int qemu_fclose(QEMUFile *f);
int64_t qemu_ftell(QEMUFile *f);
void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size);
void qemu_put_byte(QEMUFile *f, int v);

9
savevm.c
View File

@ -673,9 +673,14 @@ int qemu_get_byte(QEMUFile *f)
return result;
}
static int64_t qemu_ftell(QEMUFile *f)
int64_t qemu_ftell(QEMUFile *f)
{
return f->buf_offset - f->buf_size + f->buf_index;
/* buf_offset excludes buffer for writing but includes it for reading */
if (f->is_write) {
return f->buf_offset + f->buf_index;
} else {
return f->buf_offset - f->buf_size + f->buf_index;
}
}
int qemu_file_rate_limit(QEMUFile *f)