[Qemu-block] [PATCH v2 02/40] blockjob: Improve BlockJobInfo.offset/len documentation

[Kevin Wolf]

Clarify that len is just an estimation of the end value of offset, and
that offset increases monotonically while len can change arbitrarily.

Signed-off-by: Kevin Wolf <address@hidden>
---
 qapi/block-core.json | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index d32ec95666..0e29abf099 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1148,7 +1148,12 @@
 # @device: The job identifier. Originally the device name but other
 #          values are allowed since QEMU 2.7
 #
-# @len: the maximum progress value
+# @len: Estimated @offset value at the completion of the job. This value can
+#       arbitrarily change while the job is running, in both directions.
+#
+# @offset: Progress made until now. The unit is arbitrary and the value can
+#          only meaningfully be used for the ratio of @offset to @len. The
+#          value is monotonically increasing.
 #
 # @busy: false if the job is known to be in a quiescent state, with
 #        no pending I/O.  Since 1.3.
@@ -1156,8 +1161,6 @@
 # @paused: whether the job is paused or, if @busy is true, will
 #          pause itself as soon as possible.  Since 1.3.
 #
-# @offset: the current progress value
-#
 # @speed: the rate limit, bytes per second
 #
 # @io-status: the status of the job (since 1.3)
-- 
2.13.6