[Qemu-devel] [RESEND PATCH 0/2] QEMUSizedBuffer/QEMUFile fixes

[Qemu-devel] [RESEND PATCH 0/2] QEMUSizedBuffer/QEMUFile fixes

[Yang Hongyang]

Rebased to the latest master.

Yang Hongyang (2):
  QEMUSizedBuffer: only free qsb that qemu_bufopen allocated
  Tests: QEMUSizedBuffer/QEMUBuffer

 migration/qemu-file-buf.c | 10 ++++++----
 tests/test-vmstate.c      | 20 ++++++++------------
 2 files changed, 14 insertions(+), 16 deletions(-)

-- 
1.9.1

[Qemu-devel] [RESEND PATCH 1/2] QEMUSizedBuffer: only free qsb that qemu_bufopen allocated

[Yang Hongyang]

Only free qsb that qemu_bufopen allocated, and also allow
qemu_bufopen accept qsb as input for write operation. It
will make the API more logical:
1.If you create the QEMUSizedBuffer yourself, you need to
  free it by using qsb_free() but not depends on other API
  like qemu_fclose.
2.allow qemu_bufopen() accept QEMUSizedBuffer as input for
  write operation, otherwise, it will be a little strange
  for this API won't accept the second parameter.

This brings API change, since there are only 3
users of this API currently, this change only impact the
first one which will be fixed in patch 2 of this patchset,
so I think it is safe to do this change.

1     70  tests/test-vmstate.c <<open_mem_file_read>>
            return qemu_bufopen("r", qsb);
2    404  tests/test-vmstate.c <<test_save_noskip>>
            QEMUFile *fsave = qemu_bufopen("w", NULL);
3    424  tests/test-vmstate.c <<test_save_skip>>
            QEMUFile *fsave = qemu_bufopen("w", NULL);

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/qemu-file-buf.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/migration/qemu-file-buf.c b/migration/qemu-file-buf.c
index d33dd44..e97e0bd 100644
--- a/migration/qemu-file-buf.c
+++ b/migration/qemu-file-buf.c
@@ -395,6 +395,7 @@ QEMUSizedBuffer *qsb_clone(const QEMUSizedBuffer *qsb)
 typedef struct QEMUBuffer {
     QEMUSizedBuffer *qsb;
     QEMUFile *file;
+    bool qsb_allocated;
 } QEMUBuffer;
 
 static int buf_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
@@ -424,7 +425,9 @@ static int buf_close(void *opaque)
 {
     QEMUBuffer *s = opaque;
 
-    qsb_free(s->qsb);
+    if (s->qsb_allocated) {
+        qsb_free(s->qsb);
+    }
 
     g_free(s);
 
@@ -463,12 +466,11 @@ QEMUFile *qemu_bufopen(const char *mode, QEMUSizedBuffer *input)
     }
 
     s = g_malloc0(sizeof(QEMUBuffer));
-    if (mode[0] == 'r') {
-        s->qsb = input;
-    }
+    s->qsb = input;
 
     if (s->qsb == NULL) {
         s->qsb = qsb_create(NULL, 0);
+        s->qsb_allocated = true;
     }
     if (!s->qsb) {
         g_free(s);
-- 
1.9.1

[Qemu-devel] [RESEND PATCH 2/2] Tests: QEMUSizedBuffer/QEMUBuffer

[Yang Hongyang]

Modify some of tests/test-vmstate.c due to qemu_bufopen() change.
If you create a QEMUSizedBuffer yourself, you have to explicitly
free it.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 tests/test-vmstate.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/tests/test-vmstate.c b/tests/test-vmstate.c
index 5e0fd13..39b7b01 100644
--- a/tests/test-vmstate.c
+++ b/tests/test-vmstate.c
@@ -60,16 +60,6 @@ static QEMUFile *open_test_file(bool write)
     return qemu_fdopen(fd, write ? "wb" : "rb");
 }
 
-/* Open a read-only qemu-file from an existing memory block */
-static QEMUFile *open_mem_file_read(const void *data, size_t len)
-{
-    /* The qsb gets freed by qemu_fclose */
-    QEMUSizedBuffer *qsb = qsb_create(data, len);
-    g_assert(qsb);
-
-    return qemu_bufopen("r", qsb);
-}
-
 /*
  * Check that the contents of the memory-buffered file f match
  * the given size/data.
@@ -450,7 +440,9 @@ static void test_load_noskip(void)
         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
     };
 
-    QEMUFile *loading = open_mem_file_read(buf, sizeof(buf));
+    QEMUSizedBuffer *qsb = qsb_create(buf, sizeof(buf));
+    g_assert(qsb);
+    QEMUFile *loading = qemu_bufopen("r", qsb);
     TestStruct obj = { .skip_c_e = false };
     vmstate_load_state(loading, &vmstate_skipping, &obj, 2);
     g_assert(!qemu_file_get_error(loading));
@@ -461,6 +453,7 @@ static void test_load_noskip(void)
     g_assert_cmpint(obj.e, ==, 50);
     g_assert_cmpint(obj.f, ==, 60);
     qemu_fclose(loading);
+    qsb_free(qsb);
 }
 
 static void test_load_skip(void)
@@ -473,7 +466,9 @@ static void test_load_skip(void)
         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
     };
 
-    QEMUFile *loading = open_mem_file_read(buf, sizeof(buf));
+    QEMUSizedBuffer *qsb = qsb_create(buf, sizeof(buf));
+    g_assert(qsb);
+    QEMUFile *loading = qemu_bufopen("r", qsb);
     TestStruct obj = { .skip_c_e = true, .c = 300, .e = 500 };
     vmstate_load_state(loading, &vmstate_skipping, &obj, 2);
     g_assert(!qemu_file_get_error(loading));
@@ -484,6 +479,7 @@ static void test_load_skip(void)
     g_assert_cmpint(obj.e, ==, 500);
     g_assert_cmpint(obj.f, ==, 60);
     qemu_fclose(loading);
+    qsb_free(qsb);
 }
 
 int main(int argc, char **argv)
-- 
1.9.1

Re: [Qemu-devel] [RESEND PATCH 0/2] QEMUSizedBuffer/QEMUFile fixes

[Hongyang Yang]

Ping...

在 12/19/2014 11:38 AM, Yang Hongyang 写道:
> Rebased to the latest master.
>
> Yang Hongyang (2):
>    QEMUSizedBuffer: only free qsb that qemu_bufopen allocated
>    Tests: QEMUSizedBuffer/QEMUBuffer
>
>   migration/qemu-file-buf.c | 10 ++++++----
>   tests/test-vmstate.c      | 20 ++++++++------------
>   2 files changed, 14 insertions(+), 16 deletions(-)
>

-- 
Thanks,
Yang.