Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches

# gpg: Signature made Thu 16 Jun 2016 15:01:27 BST
# gpg:                using RSA key 0x7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream: (39 commits)
  hbitmap: add 'pos < size' asserts
  iotests: Add test for oVirt-like storage migration
  iotests: Add test for post-mirror backing chains
  block/null: Implement bdrv_refresh_filename()
  block/mirror: Fix target backing BDS
  block: Allow replacement of a BDS by its overlay
  rbd:change error_setg() to error_setg_errno()
  iotests: 095: Clean up QEMU before showing image info
  block: Create the commit block job before reopening any image
  block: Prevent sleeping jobs from resuming if they have been paused
  block: use the block job list in qmp_query_block_jobs()
  block: use the block job list in bdrv_drain_all()
  block: Fix snapshot=on with aio=native
  block: Remove bs->zero_beyond_eof
  qcow2: Let vmstate call qcow2_co_preadv/pwrite directly
  block: Make bdrv_load/save_vmstate coroutine_fns
  block: Allow .bdrv_load/save_vmstate() to return 0/-errno
  block: Make .bdrv_load_vmstate() vectored
  block: Introduce bdrv_preadv()
  doc: Fix mailing list address in tests/qemu-iotests/README
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 35 insertions, 11 deletions

diff --git a/include/block/block.h b/include/block/block.h
index 54cca28bac..733a8ec2ec 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -65,6 +65,9 @@ typedef enum {
     BDRV_REQ_MAY_UNMAP          = 0x4,
     BDRV_REQ_NO_SERIALISING     = 0x8,
     BDRV_REQ_FUA                = 0x10,
+
+    /* Mask of valid flags */
+    BDRV_REQ_MASK               = 0x1f,
 } BdrvRequestFlags;
 
 typedef struct BlockSizes {
@@ -232,6 +235,7 @@ int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 int bdrv_pread(BlockDriverState *bs, int64_t offset,
                void *buf, int count);
+int bdrv_preadv(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                 const void *buf, int count);
 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
@@ -401,10 +405,14 @@ int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
                           const uint8_t *buf, int nb_sectors);
 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
+void bdrv_round_sectors_to_clusters(BlockDriverState *bs,
+                                    int64_t sector_num, int nb_sectors,
+                                    int64_t *cluster_sector_num,
+                                    int *cluster_nb_sectors);
 void bdrv_round_to_clusters(BlockDriverState *bs,
-                            int64_t sector_num, int nb_sectors,
-                            int64_t *cluster_sector_num,
-                            int *cluster_nb_sectors);
+                            int64_t offset, unsigned int bytes,
+                            int64_t *cluster_offset,
+                            unsigned int *cluster_bytes);
 
 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 void bdrv_get_backing_filename(BlockDriverState *bs,
@@ -423,6 +431,7 @@ void path_combine(char *dest, int dest_size,
                   const char *base_path,
                   const char *filename);
 
+int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
                       int64_t pos, int size);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8a4963c4fe..688c6be009 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -224,10 +224,12 @@ struct BlockDriver {
     int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
     ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
 
-    int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
-                             int64_t pos);
-    int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
-                             int64_t pos, int size);
+    int coroutine_fn (*bdrv_save_vmstate)(BlockDriverState *bs,
+                                          QEMUIOVector *qiov,
+                                          int64_t pos);
+    int coroutine_fn (*bdrv_load_vmstate)(BlockDriverState *bs,
+                                          QEMUIOVector *qiov,
+                                          int64_t pos);
 
     int (*bdrv_change_backing_file)(BlockDriverState *bs,
         const char *backing_file, const char *backing_fmt);
@@ -449,9 +451,6 @@ struct BlockDriverState {
     /* I/O Limits */
     BlockLimits bl;
 
-    /* Whether produces zeros when read beyond eof */
-    bool zero_beyond_eof;
-
     /* Alignment requirement for offset/length of I/O requests */
     unsigned int request_alignment;
     /* Flags honored during pwrite (so far: BDRV_REQ_FUA) */
@@ -510,6 +509,20 @@ struct BlockBackendRootState {
     BlockdevDetectZeroesOptions detect_zeroes;
 };
 
+typedef enum BlockMirrorBackingMode {
+    /* Reuse the existing backing chain from the source for the target.
+     * - sync=full: Set backing BDS to NULL.
+     * - sync=top:  Use source's backing BDS.
+     * - sync=none: Use source as the backing BDS. */
+    MIRROR_SOURCE_BACKING_CHAIN,
+
+    /* Open the target's backing chain completely anew */
+    MIRROR_OPEN_BACKING_CHAIN,
+
+    /* Do not change the target's backing BDS after job completion */
+    MIRROR_LEAVE_BACKING_CHAIN,
+} BlockMirrorBackingMode;
+
 static inline BlockDriverState *backing_bs(BlockDriverState *bs)
 {
     return bs->backing ? bs->backing->bs : NULL;
@@ -672,6 +685,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
  * @granularity: The chosen granularity for the dirty bitmap.
  * @buf_size: The amount of data that can be in flight at one time.
  * @mode: Whether to collapse all images in the chain to the target.
+ * @backing_mode: How to establish the target's backing chain after completion.
  * @on_source_error: The action to take upon error reading from the source.
  * @on_target_error: The action to take upon error writing to the target.
  * @unmap: Whether to unmap target where source sectors only contain zeroes.
@@ -687,7 +701,8 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
 void mirror_start(BlockDriverState *bs, BlockDriverState *target,
                   const char *replaces,
                   int64_t speed, uint32_t granularity, int64_t buf_size,
-                  MirrorSyncMode mode, BlockdevOnError on_source_error,
+                  MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
+                  BlockdevOnError on_source_error,
                   BlockdevOnError on_target_error,
                   bool unmap,
                   BlockCompletionFunc *cb,