[Qemu-devel] [PATCH V2 4/7] qed: add bdrv_invalidate_cache to be called after incoming live migration

["Benoît Canet" <benoit.canet@gmail.com>]

The QED image is reopened to flush metadata and check consistency.

Signed-off-by: Benoit Canet <benoit.canet@gmail.com>
---
 block/qed.c |   15 +++++++++++++++
 block/qed.h |    1 +
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/block/qed.c b/block/qed.c
index a041d31..c47272c 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -375,6 +375,10 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags)
     int ret;
 
     s->bs = bs;
+
+    /* backup flags for bdrv_qed_invalidate_cache */
+    s->flags = flags;
+
     QSIMPLEQ_INIT(&s->allocating_write_reqs);
 
     ret = bdrv_pread(bs->file, 0, &le_header, sizeof(le_header));
@@ -1516,6 +1520,16 @@ static int bdrv_qed_change_backing_file(BlockDriverState *bs,
     return ret;
 }
 
+static void bdrv_qed_invalidate_cache(BlockDriverState *bs)
+{
+    BDRVQEDState *s = bs->opaque;
+    int flags = s->flags;
+
+    bdrv_qed_close(bs);
+    memset(s, 0, sizeof(BDRVQEDState));
+    bdrv_qed_open(bs, flags);
+}
+
 static int bdrv_qed_check(BlockDriverState *bs, BdrvCheckResult *result)
 {
     BDRVQEDState *s = bs->opaque;
@@ -1568,6 +1582,7 @@ static BlockDriver bdrv_qed = {
     .bdrv_getlength           = bdrv_qed_getlength,
     .bdrv_get_info            = bdrv_qed_get_info,
     .bdrv_change_backing_file = bdrv_qed_change_backing_file,
+    .bdrv_invalidate_cache    = bdrv_qed_invalidate_cache,
     .bdrv_check               = bdrv_qed_check,
 };
 
diff --git a/block/qed.h b/block/qed.h
index 62624a1..cb1ebd8 100644
--- a/block/qed.h
+++ b/block/qed.h
@@ -153,6 +153,7 @@ typedef struct QEDAIOCB {
 
 typedef struct {
     BlockDriverState *bs;           /* device */
+    int flags;                      /* open flags */
     uint64_t file_size;             /* length of image file, in bytes */
 
     QEDHeader header;               /* always cpu-endian */
-- 
1.7.7.6