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[Qemu-devel] [PATCH for-1.4 1/2] migration: make qemu_ftell() public and
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH for-1.4 1/2] migration: make qemu_ftell() public and support writable files |
Date: |
Tue, 12 Feb 2013 10:37:14 +0100 |
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 <address@hidden>
---
include/migration/qemu-file.h | 1 +
savevm.c | 9 +++++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h
index 68deefb..46fc11d 100644
--- a/include/migration/qemu-file.h
+++ b/include/migration/qemu-file.h
@@ -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);
diff --git a/savevm.c b/savevm.c
index 0b6724d..a8a53ef 100644
--- a/savevm.c
+++ b/savevm.c
@@ -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)
--
1.8.1.2