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

Block layer patches

- Fix I/O errors because of incorrectly detected max_iov
- Fix not white-listed copy-before-write
- qemu-storage-daemon: Only display FUSE help when FUSE is built-in
- iotests: update environment and linting configuration

# gpg: Signature made Wed 06 Oct 2021 03:58:10 AM PDT
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]

* remotes/kwolf/tags/for-upstream:
  iotests: Update for pylint 2.11.1
  iotests/migrate-bitmaps-test: delint
  iotests/mirror-top-perms: Adjust imports
  iotests/linters: check mypy files all at once
  iotests: add 'qemu' package location to PYTHONPATH in testenv
  block: introduce max_hw_iov for use in scsi-generic
  iotests/image-fleecing: declare requirement of copy-before-write
  block: bdrv_insert_node(): don't use bdrv_open()
  block: bdrv_insert_node(): doc and style
  block: bdrv_insert_node(): fix and improve error handling
  block: implement bdrv_new_open_driver_opts()
  qemu-storage-daemon: Only display FUSE help when FUSE is built-in
  include/block.h: remove outdated comment

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 13 insertions, 3 deletions

diff --git a/include/block/block.h b/include/block/block.h
index 740038a..e5dd22b 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -383,6 +383,10 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
                            const char *bdref_key, Error **errp);
 BlockDriverState *bdrv_open(const char *filename, const char *reference,
                             QDict *options, int flags, Error **errp);
+BlockDriverState *bdrv_new_open_driver_opts(BlockDriver *drv,
+                                            const char *node_name,
+                                            QDict *options, int flags,
+                                            Error **errp);
 BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name,
                                        int flags, Error **errp);
 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
@@ -751,9 +755,7 @@ bool bdrv_drain_poll(BlockDriverState *bs, bool recursive,
  * bdrv_drained_begin:
  *
  * Begin a quiesced section for exclusive access to the BDS, by disabling
- * external request sources including NBD server and device model. Note that
- * this doesn't block timers or coroutines from submitting more requests, which
- * means block_job_pause is still necessary.
+ * external request sources including NBD server, block jobs, and device model.
  *
  * This function can be recursive.
  */
diff --git a/include/block/block_int.h b/include/block/block_int.h
index ffe8606..f4c75e8 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -718,6 +718,13 @@ typedef struct BlockLimits {
      */
     uint64_t max_hw_transfer;
 
+    /* Maximal number of scatter/gather elements allowed by the hardware.
+     * Applies whenever transfers to the device bypass the kernel I/O
+     * scheduler, for example with SG_IO.  If larger than max_iov
+     * or if zero, blk_get_max_hw_iov will fall back to max_iov.
+     */
+    int max_hw_iov;
+
     /* memory alignment, in bytes so that no bounce buffer is needed */
     size_t min_mem_alignment;
 
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 29d4fdb..82bae55 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -211,6 +211,7 @@ uint32_t blk_get_request_alignment(BlockBackend *blk);
 uint32_t blk_get_max_transfer(BlockBackend *blk);
 uint64_t blk_get_max_hw_transfer(BlockBackend *blk);
 int blk_get_max_iov(BlockBackend *blk);
+int blk_get_max_hw_iov(BlockBackend *blk);
 void blk_set_guest_block_size(BlockBackend *blk, int align);
 void *blk_try_blockalign(BlockBackend *blk, size_t size);
 void *blk_blockalign(BlockBackend *blk, size_t size);