[Qemu-devel] [PATCH] blkdebug: fix "once" rule

[John Snow <jsnow@redhat.com>]

The blkdebug scripts are currently engineered so that when a debug event
occurs, a prefilter browses a master list of parsed rules for a certain
event and adds them to an "active list" of rules to be used for the
forthcoming action, provided the events and state numbers match.

Then, once the request is received, the last active rule is used to inject
an error if certain parameters match.

This active list is cleared every time the prefilter injects a new rule
for the first time during a debug event.

The "once" rule currently causes the error injection, if it is triggered,
to only clear the active list. This is insufficient for preventing future
injections of the same rule.

This patch /deletes/ the rule from the list that the prefilter browses,
so it is gone for good.

Lastly, this impacts iotests 026. Several ENOSPC tests that used "once"
can be seen to have output that shows multiple failure messages. After
this patch, the error messages tend to be smaller and less severe, but
the injection can still be seen to be working.

Patch the expected output to expect the smaller error messages.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 block/blkdebug.c           |  9 +++++----
 tests/qemu-iotests/026.out | 24 ++++--------------------
 2 files changed, 9 insertions(+), 24 deletions(-)

diff --git a/block/blkdebug.c b/block/blkdebug.c
index 9ce35cd..d30c44c 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -473,14 +473,15 @@ static BlockAIOCB *inject_error(BlockDriverState *bs,
     struct BlkdebugAIOCB *acb;
     QEMUBH *bh;
 
-    if (rule->options.inject.once) {
-        QSIMPLEQ_INIT(&s->active_rules);
-    }
-
     if (rule->options.inject.immediately) {
         return NULL;
     }
 
+    if (rule->options.inject.once) {
+        QSIMPLEQ_INIT(&s->active_rules);
+        remove_rule(rule);
+    }
+
     acb = qemu_aio_get(&blkdebug_aiocb_info, bs, cb, opaque);
     acb->ret = -error;
 
diff --git a/tests/qemu-iotests/026.out b/tests/qemu-iotests/026.out
index 524f7ee..5e964fb 100644
--- a/tests/qemu-iotests/026.out
+++ b/tests/qemu-iotests/026.out
@@ -140,19 +140,13 @@ No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: l2_update; errno: 5; imm: off; once: on; write
-Failed to flush the L2 table cache: Input/output error
 write failed: Input/output error
-
-127 leaked clusters were found on the image.
-This means waste of disk space, but no harm to data.
+No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: l2_update; errno: 5; imm: off; once: on; write -b
-Failed to flush the L2 table cache: Input/output error
 write failed: Input/output error
-
-127 leaked clusters were found on the image.
-This means waste of disk space, but no harm to data.
+No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: l2_update; errno: 5; imm: off; once: off; write
@@ -174,19 +168,13 @@ This means waste of disk space, but no harm to data.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: l2_update; errno: 28; imm: off; once: on; write
-Failed to flush the L2 table cache: No space left on device
 write failed: No space left on device
-
-127 leaked clusters were found on the image.
-This means waste of disk space, but no harm to data.
+No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: l2_update; errno: 28; imm: off; once: on; write -b
-Failed to flush the L2 table cache: No space left on device
 write failed: No space left on device
-
-127 leaked clusters were found on the image.
-This means waste of disk space, but no harm to data.
+No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: l2_update; errno: 28; imm: off; once: off; write
@@ -356,13 +344,11 @@ No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: refblock_update_part; errno: 5; imm: off; once: on; write
-Failed to flush the refcount block cache: Input/output error
 write failed: Input/output error
 No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: refblock_update_part; errno: 5; imm: off; once: on; write -b
-Failed to flush the refcount block cache: Input/output error
 write failed: Input/output error
 No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -382,13 +368,11 @@ No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: refblock_update_part; errno: 28; imm: off; once: on; write
-Failed to flush the refcount block cache: No space left on device
 write failed: No space left on device
 No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
 
 Event: refblock_update_part; errno: 28; imm: off; once: on; write -b
-Failed to flush the refcount block cache: No space left on device
 write failed: No space left on device
 No errors were found on the image.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
-- 
1.9.3