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[Qemu-devel] [RFC][PATCH 0/7] blkdebug


From: Kevin Wolf
Subject: [Qemu-devel] [RFC][PATCH 0/7] blkdebug
Date: Mon, 15 Mar 2010 18:08:28 +0100

This patch series introduces a new block driver which acts as a protocol and
whose purpose it is to fail requests. To be more precise, I want it to fail in
configurable places, so that qemu-iotests can be extended with tests for the
error paths (for example for the case when something with metadata writes goes
wrong deep in qcow2).

It works like this (I think this is self-explanatory):

$ cat /tmp/blkdebug.cfg
[inject-error]
event = "l1_update"
errno = "5"
immediately = "on"
$ qemu-io blkdebug:/tmp/blkdebug.cfg:/tmp/empty.qcow2
qemu-io> read 0 4k
read 4096/4096 bytes at offset 0
4 KiB, 1 ops; 0.0000 sec (195.312 MiB/sec and 50000.0000 ops/sec)
qemu-io> write 0 4k
bdrv_debug_event: 4
blkdebug_debug_event: 4
write failed: Input/output error

Basically what I think is left to do is:
- Resolve TODOs and FIXMEs left in the code
- Require blkdebug to be explicitly enabled before compiling in event
  generation (not sure if it really matters)
- Add more events, they are only added for qcow2-clusters so far
- Address your comments (if any)

Kevin Wolf (7):
  qemu-config: qemu_read_config_file() reads the normal config file
  qemu-config: Make qemu_config_parse more generic
  blkdebug: Basic request passthrough
  blkdebug: Inject errors
  Make qemu-config available for tools
  blkdebug: Add events and rules
  qcow2: Trigger blkdebug events

 Makefile.objs         |    6 +-
 block.c               |   13 ++
 block.h               |   28 ++++
 block/blkdebug.c      |  423 +++++++++++++++++++++++++++++++++++++++++++++++++
 block/qcow2-cluster.c |   15 ++
 block_int.h           |    2 +
 hw/qdev-properties.c  |   19 ++-
 hw/qdev.h             |    1 -
 qemu-config.c         |   45 +++---
 qemu-config.h         |    4 +-
 vl.c                  |   34 ++---
 11 files changed, 540 insertions(+), 50 deletions(-)
 create mode 100644 block/blkdebug.c





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