[PATCH 03/19] Introduce skip_header parameter to qemu_loadvm_state().

Yoshiaki Tamura
2011-01-28T07:23:45Z

Introduce skip_header parameter to qemu_loadvm_state() so that it can
be called iteratively without reading the header.

Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
---
migration.c | 2 +-
savevm.c | 24 +++++++++++++-----------
sysemu.h | 2 +-
3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/migration.c b/migration.c
index bee20f0..11eff51 100644
--- a/migration.c
+++ b/migration.c
@@ -60,7 +60,7 @@ int qemu_start_incoming_migration(const char *uri)

void process_incoming_migration(QEMUFile *f)
{
- if (qemu_loadvm_state(f) < 0) {
+ if (qemu_loadvm_state(f, 0) < 0) {
fprintf(stderr, "load of migration failed\n");
exit(0);
}
diff --git a/savevm.c b/savevm.c
index d1efdd3..dc15c03 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1709,7 +1709,7 @@ typedef struct LoadStateEntry {
int version_id;
} LoadStateEntry;

-int qemu_loadvm_state(QEMUFile *f)
+int qemu_loadvm_state(QEMUFile *f, int skip_header)
{
QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
QLIST_HEAD_INITIALIZER(loadvm_handlers);
@@ -1722,17 +1722,19 @@ int qemu_loadvm_state(QEMUFile *f)
return -EINVAL;
}

- v = qemu_get_be32(f);
- if (v != QEMU_VM_FILE_MAGIC)
- return -EINVAL;
+ if (!skip_header) {
+ v = qemu_get_be32(f);
+ if (v != QEMU_VM_FILE_MAGIC)
+ return -EINVAL;

- v = qemu_get_be32(f);
- if (v == QEMU_VM_FILE_VERSION_COMPAT) {
- fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
- return -ENOTSUP;
+ v = qemu_get_be32(f);
+ if (v == QEMU_VM_FILE_VERSION_COMPAT) {
+ fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
+ return -ENOTSUP;
+ }
+ if (v != QEMU_VM_FILE_VERSION)
+ return -ENOTSUP;
}
- if (v != QEMU_VM_FILE_VERSION)
- return -ENOTSUP;

while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
uint32_t instance_id, version_id, section_id;
@@ -2055,7 +2057,7 @@ int load_vmstate(const char *name)
return -EINVAL;
}

- ret = qemu_loadvm_state(f);
+ ret = qemu_loadvm_state(f, 0);

qemu_fclose(f);
if (ret < 0) {
diff --git a/sysemu.h b/sysemu.h
index 0c969f2..329415f 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -81,7 +81,7 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f);
int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f);
void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f);
-int qemu_loadvm_state(QEMUFile *f);
+int qemu_loadvm_state(QEMUFile *f, int skip_header);

/* SLIRP */
void do_info_slirp(Monitor *mon);
--
1.7.1.2