openkylin
/
qemu
mirror of https://gitee.com/openkylin/qemu.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

Revert "mirror: Don't let an operation wait for itself" 

This reverts commit 7e6c4ff792.

The fix was incomplete as it only protected against requests waiting for
themselves, but not against requests waiting for each other. We need a
different solution.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200326153628.4869-2-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-03-26 16:36:27 +01:00
parent 6fcc859fc2
commit 9178f4fe5f
1 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
block/mirror.c
View File

@ -283,14 +283,11 @@ static int mirror_cow_align(MirrorBlockJob *s, int64_t *offset,
}
static inline void coroutine_fn
mirror_wait_for_any_operation(MirrorBlockJob *s, MirrorOp *self, bool active)
mirror_wait_for_any_operation(MirrorBlockJob *s, bool active)
{
MirrorOp *op;
QTAILQ_FOREACH(op, &s->ops_in_flight, next) {
if (self == op) {
continue;
}
/* Do not wait on pseudo ops, because it may in turn wait on
* some other operation to start, which may in fact be the
* caller of this function. Since there is only one pseudo op
@ -305,10 +302,10 @@ mirror_wait_for_any_operation(MirrorBlockJob *s, MirrorOp *self, bool active)
}
static inline void coroutine_fn
mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s, MirrorOp *self)
mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s)
{
/* Only non-active operations use up in-flight slots */
mirror_wait_for_any_operation(s, self, false);
mirror_wait_for_any_operation(s, false);
}
/* Perform a mirror copy operation.
@ -351,7 +348,7 @@ static void coroutine_fn mirror_co_read(void *opaque)
while (s->buf_free_count < nb_chunks) {
trace_mirror_yield_in_flight(s, op->offset, s->in_flight);
mirror_wait_for_free_in_flight_slot(s, op);
mirror_wait_for_free_in_flight_slot(s);
}
/* Now make a QEMUIOVector taking enough granularity-sized chunks
@ -558,7 +555,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
while (s->in_flight >= MAX_IN_FLIGHT) {
trace_mirror_yield_in_flight(s, offset, s->in_flight);
mirror_wait_for_free_in_flight_slot(s, pseudo_op);
mirror_wait_for_free_in_flight_slot(s);
}
if (s->ret < 0) {
@ -612,7 +609,7 @@ static void mirror_free_init(MirrorBlockJob *s)
static void coroutine_fn mirror_wait_for_all_io(MirrorBlockJob *s)
{
while (s->in_flight > 0) {
mirror_wait_for_free_in_flight_slot(s, NULL);
mirror_wait_for_free_in_flight_slot(s);
}
}
@ -810,7 +807,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
if (s->in_flight >= MAX_IN_FLIGHT) {
trace_mirror_yield(s, UINT64_MAX, s->buf_free_count,
s->in_flight);
mirror_wait_for_free_in_flight_slot(s, NULL);
mirror_wait_for_free_in_flight_slot(s);
continue;
}
@ -963,7 +960,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
/* Do not start passive operations while there are active
* writes in progress */
while (s->in_active_write_counter) {
mirror_wait_for_any_operation(s, NULL, true);
mirror_wait_for_any_operation(s, true);
}
if (s->ret < 0) {
@ -989,7 +986,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 ||
(cnt == 0 && s->in_flight > 0)) {
trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight);
mirror_wait_for_free_in_flight_slot(s, NULL);
mirror_wait_for_free_in_flight_slot(s);
continue;
} else if (cnt != 0) {
delay_ns = mirror_iteration(s);