Block patches:

- drop block/io write notifiers
 - qemu-iotests enhancements to make debugging easier
 - rbd parsing fix
 - HMP qemu-io fix (for iothreads)
 - mirror job cancel relaxation (do not cancel in-flight requests when a
   READY mirror job is canceled with force=false)
 - document qcow2's data_file and data_file_raw features
 - fix iotest 297 for pylint 2.8
 - block/copy-on-read refactoring
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Merge remote-tracking branch 'remotes/maxreitz/tags/pull-block-2021-05-14' into staging

Block patches:
- drop block/io write notifiers
- qemu-iotests enhancements to make debugging easier
- rbd parsing fix
- HMP qemu-io fix (for iothreads)
- mirror job cancel relaxation (do not cancel in-flight requests when a
  READY mirror job is canceled with force=false)
- document qcow2's data_file and data_file_raw features
- fix iotest 297 for pylint 2.8
- block/copy-on-read refactoring

# gpg: Signature made Fri 14 May 2021 17:43:40 BST
# gpg:                using RSA key 91BEB60A30DB3E8857D11829F407DB0061D5CF40
# gpg:                issuer "mreitz@redhat.com"
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>" [full]
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/maxreitz/tags/pull-block-2021-05-14:
  write-threshold: deal with includes
  test-write-threshold: drop extra TestStruct structure
  test-write-threshold: drop extra tests
  block/write-threshold: drop extra APIs
  test-write-threshold: rewrite test_threshold_(not_)trigger tests
  block: drop write notifiers
  block/write-threshold: don't use write notifiers
  qemu-iotests: fix pylint 2.8 consider-using-with error
  block/copy-on-read: use bdrv_drop_filter() and drop s->active
  Document qemu-img options data_file and data_file_raw
  qemu-iotests: fix case of SOCK_DIR already in the environment
  qemu-iotests: let "check" spawn an arbitrary test command
  qemu-iotests: move command line and environment handling from TestRunner to TestEnv
  qemu-iotests: allow passing unittest.main arguments to the test scripts
  qemu-iotests: do not buffer the test output
  mirror: stop cancelling in-flight requests on non-force cancel in READY
  monitor: hmp_qemu_io: acquire aio contex, fix crash
  block/rbd: Add an escape-aware strchr helper
  iotests/231: Update expected deprecation message

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

include/block/block_int.h

@@ -357,7 +357,7 @@ struct BlockDriver {
      * of in-flight requests, so don't waste the time if possible.
      *
      * One example usage is to avoid waiting for an nbd target node reconnect
-     * timeout during job-cancel.
+     * timeout during job-cancel with force=true.
      */
     void (*bdrv_cancel_in_flight)(BlockDriverState *bs);
 
@@ -954,12 +954,8 @@ struct BlockDriverState {
      */
     int64_t total_sectors;
 
-    /* Callback before write request is processed */
-    NotifierWithReturnList before_write_notifiers;
-
     /* threshold limit for writes, in bytes. "High water mark". */
     uint64_t write_threshold_offset;
-    NotifierWithReturn write_threshold_notifier;
 
     /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
      * Reading from the list can be done with either the BQL or the
@@ -1084,15 +1080,6 @@ void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix,
 bool bdrv_backing_overridden(BlockDriverState *bs);
 
 
-/**
- * bdrv_add_before_write_notifier:
- *
- * Register a callback that is invoked before write requests are processed but
- * after any throttling or waiting for overlapping requests.
- */
-void bdrv_add_before_write_notifier(BlockDriverState *bs,
-                                    NotifierWithReturn *notifier);
-
 /**
  * bdrv_add_aio_context_notifier:
  *

include/block/write-threshold.h

@@ -13,7 +13,7 @@
 #ifndef BLOCK_WRITE_THRESHOLD_H
 #define BLOCK_WRITE_THRESHOLD_H
 
-#include "block/block_int.h"
+#include "qemu/typedefs.h"
 
 /*
  * bdrv_write_threshold_set:
@@ -36,27 +36,12 @@ void bdrv_write_threshold_set(BlockDriverState *bs, uint64_t threshold_bytes);
 uint64_t bdrv_write_threshold_get(const BlockDriverState *bs);
 
 /*
- * bdrv_write_threshold_is_set
+ * bdrv_write_threshold_check_write
  *
- * Tell if a write threshold is set for a given BDS.
+ * Check whether the specified request exceeds the write threshold.
+ * If so, send a corresponding event and disable write threshold checking.
  */
-bool bdrv_write_threshold_is_set(const BlockDriverState *bs);
-
-/*
- * bdrv_write_threshold_exceeded
- *
- * Return the extent of a write request that exceeded the threshold,
- * or zero if the request is below the threshold.
- * Return zero also if the threshold was not set.
- *
- * NOTE: here we assume the following holds for each request this code
- * deals with:
- *
- * assert((req->offset + req->bytes) <= UINT64_MAX)
- *
- * Please not there is *not* an actual C assert().
- */
-uint64_t bdrv_write_threshold_exceeded(const BlockDriverState *bs,
-                                       const BdrvTrackedRequest *req);
+void bdrv_write_threshold_check_write(BlockDriverState *bs, int64_t offset,
+                                      int64_t bytes);
 
 #endif

include/qemu/job.h

@@ -254,7 +254,7 @@ struct JobDriver {
     /**
      * If the callback is not NULL, it will be invoked in job_cancel_async
      */
-    void (*cancel)(Job *job);
+    void (*cancel)(Job *job, bool force);
 
 
     /** Called when the job is freed */