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

Block layer patches:

- Block graph change fixes (avoid loops, cope with non-tree graphs)
- bdrv_set_aio_context() related fixes
- HMP snapshot commands: Use only tag, not the ID to identify snapshots
- qmeu-img, commit: Error path fixes
- block/nvme: Build fix for gcc 9
- MAINTAINERS updates
- Fix various issues with bdrv_refresh_filename()
- Fix various iotests
- Include LUKS overhead in qemu-img measure for qcow2
- A fix for vmdk's image creation interface

# gpg: Signature made Mon 25 Feb 2019 14:18:15 GMT
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream: (71 commits)
  iotests: Skip 211 on insufficient memory
  vmdk: false positive of compat6 with hwversion not set
  iotests: add LUKS payload overhead to 178 qemu-img measure test
  qcow2: include LUKS payload overhead in qemu-img measure
  iotests.py: s/_/-/g on keys in qmp_log()
  iotests: Let 045 be run concurrently
  iotests: Filter SSH paths
  iotests.py: Filter filename in any string value
  iotests.py: Add is_str()
  iotests: Fix 207 to use QMP filters for qmp_log
  iotests: Fix 232 for LUKS
  iotests: Remove superfluous rm from 232
  iotests: Fix 237 for Python 2.x
  iotests: Re-add filename filters
  iotests: Test json:{} filenames of internal BDSs
  block: BDS options may lack the "driver" option
  block/null: Generate filename even with latency-ns
  block/curl: Implement bdrv_refresh_filename()
  block/curl: Harmonize option defaults
  block/nvme: Fix bdrv_refresh_filename()
  ...

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

4 files changed, 60 insertions, 15 deletions

diff --git a/include/block/block.h b/include/block/block.h
index 73357c6c25..5b5cf868df 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -485,21 +485,17 @@ void bdrv_round_to_clusters(BlockDriverState *bs,
                             int64_t *cluster_offset,
                             int64_t *cluster_bytes);
 
-const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 void bdrv_get_backing_filename(BlockDriverState *bs,
                                char *filename, int filename_size);
-void bdrv_get_full_backing_filename(BlockDriverState *bs,
-                                    char *dest, size_t sz, Error **errp);
-void bdrv_get_full_backing_filename_from_filename(const char *backed,
-                                                  const char *backing,
-                                                  char *dest, size_t sz,
-                                                  Error **errp);
+char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp);
+char *bdrv_get_full_backing_filename_from_filename(const char *backed,
+                                                   const char *backing,
+                                                   Error **errp);
+char *bdrv_dirname(BlockDriverState *bs, Error **errp);
 
 int path_has_protocol(const char *path);
 int path_is_absolute(const char *path);
-void path_combine(char *dest, int dest_size,
-                  const char *base_path,
-                  const char *filename);
+char *path_combine(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);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 0075bafd10..836d67c1ae 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -139,7 +139,42 @@ struct BlockDriver {
                                             Error **errp);
     int (*bdrv_make_empty)(BlockDriverState *bs);
 
-    void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
+    /*
+     * Refreshes the bs->exact_filename field. If that is impossible,
+     * bs->exact_filename has to be left empty.
+     */
+    void (*bdrv_refresh_filename)(BlockDriverState *bs);
+
+    /*
+     * Gathers the open options for all children into @target.
+     * A simple format driver (without backing file support) might
+     * implement this function like this:
+     *
+     *     QINCREF(bs->file->bs->full_open_options);
+     *     qdict_put(target, "file", bs->file->bs->full_open_options);
+     *
+     * If not specified, the generic implementation will simply put
+     * all children's options under their respective name.
+     *
+     * @backing_overridden is true when bs->backing seems not to be
+     * the child that would result from opening bs->backing_file.
+     * Therefore, if it is true, the backing child's options should be
+     * gathered; otherwise, there is no need since the backing child
+     * is the one implied by the image header.
+     *
+     * Note that ideally this function would not be needed.  Every
+     * block driver which implements it is probably doing something
+     * shady regarding its runtime option structure.
+     */
+    void (*bdrv_gather_child_options)(BlockDriverState *bs, QDict *target,
+                                      bool backing_overridden);
+
+    /*
+     * Returns an allocated string which is the directory name of this BDS: It
+     * will be used to make relative filenames absolute by prepending this
+     * function's return value to them.
+     */
+    char *(*bdrv_dirname)(BlockDriverState *bs, Error **errp);
 
     /* aio */
     BlockAIOCB *(*bdrv_aio_preadv)(BlockDriverState *bs,
@@ -510,6 +545,13 @@ struct BlockDriver {
     void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size);
     void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host);
     QLIST_ENTRY(BlockDriver) list;
+
+    /* Pointer to a NULL-terminated array of names of strong options
+     * that can be specified for bdrv_open(). A strong option is one
+     * that changes the data of a BDS.
+     * If this pointer is NULL, the array is considered empty.
+     * "filename" and "driver" are always considered strong. */
+    const char *const *strong_runtime_opts;
 };
 
 typedef struct BlockLimits {
@@ -662,6 +704,11 @@ struct BdrvChild {
      */
     uint64_t shared_perm;
 
+    /* backup of permissions during permission update procedure */
+    bool has_backup_perm;
+    uint64_t backup_perm;
+    uint64_t backup_shared_perm;
+
     QLIST_ENTRY(BdrvChild) next;
     QLIST_ENTRY(BdrvChild) next_parent;
 };
@@ -697,6 +744,10 @@ struct BlockDriverState {
     char filename[PATH_MAX];
     char backing_file[PATH_MAX]; /* if non zero, the image is a diff of
                                     this file image */
+    /* The backing filename indicated by the image header; if we ever
+     * open this file, then this is replaced by the resulting BDS's
+     * filename (i.e. after a bdrv_refresh_filename() run). */
+    char auto_backing_file[PATH_MAX];
     char backing_format[16]; /* if non-zero and backing_file exists */
 
     QDict *full_open_options;
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 96cfb1d7d5..c6ef1ef42e 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -300,7 +300,8 @@ int nbd_receive_export_list(QIOChannel *ioc, QCryptoTLSCreds *tlscreds,
 int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info,
              Error **errp);
 int nbd_send_request(QIOChannel *ioc, NBDRequest *request);
-int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp);
+int coroutine_fn nbd_receive_reply(BlockDriverState *bs, QIOChannel *ioc,
+                                   NBDReply *reply, Error **errp);
 int nbd_client(int fd);
 int nbd_disconnect(int fd);
 int nbd_errno_to_system_errno(int err);
diff --git a/include/block/snapshot.h b/include/block/snapshot.h
index f73d1094af..b5d5084a12 100644
--- a/include/block/snapshot.h
+++ b/include/block/snapshot.h
@@ -61,9 +61,6 @@ int bdrv_snapshot_delete(BlockDriverState *bs,
                          const char *snapshot_id,
                          const char *name,
                          Error **errp);
-int bdrv_snapshot_delete_by_id_or_name(BlockDriverState *bs,
-                                       const char *id_or_name,
-                                       Error **errp);
 int bdrv_snapshot_list(BlockDriverState *bs,
                        QEMUSnapshotInfo **psn_info);
 int bdrv_snapshot_load_tmp(BlockDriverState *bs,